Bug 6859 #3 Binding generator v1 refactoring
[mdsal.git] / binding / mdsal-binding-generator-impl / src / main / java / org / opendaylight / mdsal / binding / yang / types / TypeProviderImpl.java
diff --git a/binding/mdsal-binding-generator-impl/src/main/java/org/opendaylight/mdsal/binding/yang/types/TypeProviderImpl.java b/binding/mdsal-binding-generator-impl/src/main/java/org/opendaylight/mdsal/binding/yang/types/TypeProviderImpl.java
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+/*
+ * Copyright (c) 2013 Cisco Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.mdsal.binding.yang.types;
+
+import static org.opendaylight.mdsal.binding.generator.util.BindingGeneratorUtil.encodeAngleBrackets;
+import static org.opendaylight.yangtools.yang.model.util.SchemaContextUtil.findDataSchemaNode;
+import static org.opendaylight.yangtools.yang.model.util.SchemaContextUtil.findDataSchemaNodeForRelativeXPath;
+import static org.opendaylight.yangtools.yang.model.util.SchemaContextUtil.findParentModule;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Sets;
+import com.google.common.io.BaseEncoding;
+import java.io.Serializable;
+import java.math.BigDecimal;
+import java.math.BigInteger;
+import java.net.URI;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.Date;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.TreeMap;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+import org.apache.commons.lang3.StringEscapeUtils;
+import org.opendaylight.mdsal.binding.generator.spi.TypeProvider;
+import org.opendaylight.mdsal.binding.generator.util.BindingGeneratorUtil;
+import org.opendaylight.mdsal.binding.generator.util.TypeConstants;
+import org.opendaylight.mdsal.binding.generator.util.Types;
+import org.opendaylight.mdsal.binding.generator.util.generated.type.builder.EnumerationBuilderImpl;
+import org.opendaylight.mdsal.binding.generator.util.generated.type.builder.GeneratedPropertyBuilderImpl;
+import org.opendaylight.mdsal.binding.generator.util.generated.type.builder.GeneratedTOBuilderImpl;
+import org.opendaylight.mdsal.binding.model.api.AccessModifier;
+import org.opendaylight.mdsal.binding.model.api.ConcreteType;
+import org.opendaylight.mdsal.binding.model.api.Enumeration;
+import org.opendaylight.mdsal.binding.model.api.GeneratedProperty;
+import org.opendaylight.mdsal.binding.model.api.GeneratedTransferObject;
+import org.opendaylight.mdsal.binding.model.api.Restrictions;
+import org.opendaylight.mdsal.binding.model.api.Type;
+import org.opendaylight.mdsal.binding.model.api.type.builder.EnumBuilder;
+import org.opendaylight.mdsal.binding.model.api.type.builder.GeneratedPropertyBuilder;
+import org.opendaylight.mdsal.binding.model.api.type.builder.GeneratedTOBuilder;
+import org.opendaylight.mdsal.binding.model.api.type.builder.GeneratedTypeBuilderBase;
+import org.opendaylight.mdsal.binding.model.api.type.builder.MethodSignatureBuilder;
+import org.opendaylight.yangtools.yang.binding.BindingMapping;
+import org.opendaylight.yangtools.yang.common.QName;
+import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
+import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.IdentitySchemaNode;
+import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
+import org.opendaylight.yangtools.yang.model.api.Module;
+import org.opendaylight.yangtools.yang.model.api.RevisionAwareXPath;
+import org.opendaylight.yangtools.yang.model.api.SchemaContext;
+import org.opendaylight.yangtools.yang.model.api.SchemaNode;
+import org.opendaylight.yangtools.yang.model.api.SchemaPath;
+import org.opendaylight.yangtools.yang.model.api.Status;
+import org.opendaylight.yangtools.yang.model.api.TypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.BinaryTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.BitsTypeDefinition.Bit;
+import org.opendaylight.yangtools.yang.model.api.type.BooleanTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.DecimalTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.EmptyTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.EnumTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.IdentityrefTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.InstanceIdentifierTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.LeafrefTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.PatternConstraint;
+import org.opendaylight.yangtools.yang.model.api.type.StringTypeDefinition;
+import org.opendaylight.yangtools.yang.model.api.type.UnionTypeDefinition;
+import org.opendaylight.yangtools.yang.model.util.RevisionAwareXPathImpl;
+import org.opendaylight.yangtools.yang.model.util.SchemaContextUtil;
+import org.opendaylight.yangtools.yang.model.util.type.BaseTypes;
+import org.opendaylight.yangtools.yang.model.util.type.CompatUtils;
+import org.opendaylight.yangtools.yang.parser.util.YangValidationException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public final class TypeProviderImpl implements TypeProvider {
+    private static final Logger LOG = LoggerFactory.getLogger(TypeProviderImpl.class);
+    private static final Pattern NUMBERS_PATTERN = Pattern.compile("[0-9]+\\z");
+
+    // Backwards compatibility: Union types used to be instantiated in YANG namespace, which is no longer
+    // the case, as unions are emitted to their correct schema path.
+    private static final SchemaPath UNION_PATH = SchemaPath.create(true,
+        org.opendaylight.yangtools.yang.model.util.BaseTypes.UNION_QNAME);
+
+    /**
+     * Contains the schema data red from YANG files.
+     */
+    private final SchemaContext schemaContext;
+
+    /**
+     * Map<moduleName, Map<moduleDate, Map<typeName, type>>>
+     */
+    private final Map<String, Map<Date, Map<String, Type>>> genTypeDefsContextMap;
+
+    /**
+     * The map which maps schema paths to JAVA <code>Type</code>.
+     */
+    private final Map<SchemaPath, Type> referencedTypes;
+    private final Map<Module, Set<Type>> additionalTypes;
+
+    /**
+     * Creates new instance of class <code>TypeProviderImpl</code>.
+     *
+     * @param schemaContext
+     *            contains the schema data red from YANG files
+     * @throws IllegalArgumentException
+     *             if <code>schemaContext</code> equal null.
+     */
+    public TypeProviderImpl(final SchemaContext schemaContext) {
+        Preconditions.checkArgument(schemaContext != null, "Schema Context cannot be null!");
+
+        this.schemaContext = schemaContext;
+        this.genTypeDefsContextMap = new HashMap<>();
+        this.referencedTypes = new HashMap<>();
+        this.additionalTypes = new HashMap<>();
+        resolveTypeDefsFromContext();
+    }
+
+    /**
+     * Puts <code>refType</code> to map with key <code>refTypePath</code>
+     *
+     * @param refTypePath
+     *            schema path used as the map key
+     * @param refType
+     *            type which represents the map value
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>refTypePath</code> equal null</li>
+     *             <li>if <code>refType</code> equal null</li>
+     *             </ul>
+     *
+     */
+    public void putReferencedType(final SchemaPath refTypePath, final Type refType) {
+        Preconditions.checkArgument(refTypePath != null,
+                "Path reference of Enumeration Type Definition cannot be NULL!");
+        Preconditions.checkArgument(refType != null, "Reference to Enumeration Type cannot be NULL!");
+        referencedTypes.put(refTypePath, refType);
+    }
+
+    public Map<Module, Set<Type>> getAdditionalTypes() {
+        return additionalTypes;
+    }
+
+    /**
+     *
+     * Converts basic YANG type <code>type</code> to JAVA <code>Type</code>.
+     *
+     * @param type
+     *            string with YANG name of type
+     * @return JAVA <code>Type</code> for YANG type <code>type</code>
+     * @see TypeProvider#javaTypeForYangType(String)
+     */
+    @Override
+    @Deprecated
+    public Type javaTypeForYangType(final String type) {
+        return BaseYangTypes.BASE_YANG_TYPES_PROVIDER.javaTypeForYangType(type);
+    }
+
+    @Override
+    public Type javaTypeForSchemaDefinitionType(final TypeDefinition<?> typeDefinition, final SchemaNode parentNode) {
+        return javaTypeForSchemaDefinitionType(typeDefinition, parentNode, null);
+    }
+
+    /**
+     * Converts schema definition type <code>typeDefinition</code> to JAVA
+     * <code>Type</code>
+     *
+     * @param typeDefinition
+     *            type definition which is converted to JAVA type
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>typeDefinition</code> equal null</li>
+     *             <li>if Qname of <code>typeDefinition</code> equal null</li>
+     *             <li>if name of <code>typeDefinition</code> equal null</li>
+     *             </ul>
+     */
+    @Override
+    public Type javaTypeForSchemaDefinitionType(final TypeDefinition<?> typeDefinition, final SchemaNode parentNode, final Restrictions r) {
+        Preconditions.checkArgument(typeDefinition != null, "Type Definition cannot be NULL!");
+        Preconditions.checkArgument(typeDefinition.getQName() != null,
+                "Type Definition cannot have non specified QName (QName cannot be NULL!)");
+        String typedefName = typeDefinition.getQName().getLocalName();
+        Preconditions.checkArgument(typedefName != null, "Type Definitions Local Name cannot be NULL!");
+
+        // Deal with base types
+        if (typeDefinition.getBaseType() == null) {
+            // We have to deal with differing handling of decimal64. The old parser used a fixed Decimal64 type
+            // and generated an enclosing ExtendedType to hold any range constraints. The new parser instantiates
+            // a base type which holds these constraints.
+            if (typeDefinition instanceof DecimalTypeDefinition) {
+                final Type ret = BaseYangTypes.BASE_YANG_TYPES_PROVIDER.javaTypeForSchemaDefinitionType(typeDefinition, parentNode, r);
+                if (ret != null) {
+                    return ret;
+                }
+            }
+
+            // Deal with leafrefs/identityrefs
+            Type ret = javaTypeForLeafrefOrIdentityRef(typeDefinition, parentNode);
+            if (ret != null) {
+                return ret;
+            }
+
+            // FIXME: it looks as though we could be using the same codepath as above...
+            ret = BaseYangTypes.BASE_YANG_TYPES_PROVIDER.javaTypeForYangType(typeDefinition.getQName().getLocalName());
+            if (ret == null) {
+                LOG.debug("Failed to resolve Java type for {}", typeDefinition);
+            }
+
+            return ret;
+        }
+
+        Type returnType = javaTypeForExtendedType(typeDefinition);
+        if (r != null && returnType instanceof GeneratedTransferObject) {
+            GeneratedTransferObject gto = (GeneratedTransferObject) returnType;
+            Module module = findParentModule(schemaContext, parentNode);
+            String basePackageName = BindingMapping.getRootPackageName(module.getQNameModule());
+            String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, typeDefinition.getPath());
+            String genTOName = BindingMapping.getClassName(typedefName);
+            String name = packageName + "." + genTOName;
+            if (!(returnType.getFullyQualifiedName().equals(name))) {
+                returnType = shadedTOWithRestrictions(gto, r);
+            }
+        }
+        return returnType;
+    }
+
+    private static GeneratedTransferObject shadedTOWithRestrictions(final GeneratedTransferObject gto, final Restrictions r) {
+        GeneratedTOBuilder gtob = new GeneratedTOBuilderImpl(gto.getPackageName(), gto.getName());
+        GeneratedTransferObject parent = gto.getSuperType();
+        if (parent != null) {
+            gtob.setExtendsType(parent);
+        }
+        gtob.setRestrictions(r);
+        for (GeneratedProperty gp : gto.getProperties()) {
+            GeneratedPropertyBuilder gpb = gtob.addProperty(gp.getName());
+            gpb.setValue(gp.getValue());
+            gpb.setReadOnly(gp.isReadOnly());
+            gpb.setAccessModifier(gp.getAccessModifier());
+            gpb.setReturnType(gp.getReturnType());
+            gpb.setFinal(gp.isFinal());
+            gpb.setStatic(gp.isStatic());
+        }
+        return gtob.toInstance();
+    }
+
+    private boolean isLeafRefSelfReference(final LeafrefTypeDefinition leafref, final SchemaNode parentNode) {
+        final SchemaNode leafRefValueNode;
+        final RevisionAwareXPath leafRefXPath = leafref.getPathStatement();
+        final RevisionAwareXPath leafRefStrippedXPath = new RevisionAwareXPathImpl(leafRefXPath.toString()
+                .replaceAll("\\[(.*?)\\]", ""), leafRefXPath.isAbsolute());
+
+        ///// skip leafrefs in augments - they're checked once augments are resolved
+        final Iterator<QName> iterator = parentNode.getPath().getPathFromRoot().iterator();
+        boolean isAugmenting = false;
+        DataNodeContainer current = null;
+        DataSchemaNode dataChildByName;
+
+        while (iterator.hasNext() && !isAugmenting) {
+            final QName next = iterator.next();
+            if (current == null) {
+                dataChildByName = schemaContext.getDataChildByName(next);
+            } else {
+                dataChildByName = current.getDataChildByName(next);
+            }
+            if (dataChildByName != null) {
+                isAugmenting = dataChildByName.isAugmenting();
+            } else {
+                return false;
+            }
+            if (dataChildByName instanceof DataNodeContainer) {
+                current = (DataNodeContainer) dataChildByName;
+            }
+        }
+        if (isAugmenting) {
+            return false;
+        }
+        /////
+
+        Module parentModule = getParentModule(parentNode);
+        if (!leafRefStrippedXPath.isAbsolute()) {
+            leafRefValueNode = SchemaContextUtil.findDataSchemaNodeForRelativeXPath(schemaContext, parentModule,
+                    parentNode, leafRefStrippedXPath);
+        } else {
+            leafRefValueNode = SchemaContextUtil.findDataSchemaNode(schemaContext, parentModule, leafRefStrippedXPath);
+        }
+        return (leafRefValueNode != null) ? leafRefValueNode.equals(parentNode) : false;
+    }
+
+    /**
+     * Returns JAVA <code>Type</code> for instances of the type
+     * <code>LeafrefTypeDefinition</code> or
+     * <code>IdentityrefTypeDefinition</code>.
+     *
+     * @param typeDefinition
+     *            type definition which is converted to JAVA <code>Type</code>
+     * @return JAVA <code>Type</code> instance for <code>typeDefinition</code>
+     */
+    private Type javaTypeForLeafrefOrIdentityRef(final TypeDefinition<?> typeDefinition, final SchemaNode parentNode) {
+        if (typeDefinition instanceof LeafrefTypeDefinition) {
+            final LeafrefTypeDefinition leafref = (LeafrefTypeDefinition) typeDefinition;
+            if (isLeafRefSelfReference(leafref, parentNode)) {
+                throw new YangValidationException("Leafref " + leafref.toString() + " is referencing itself, incoming" +
+                        " StackOverFlowError detected.");
+            }
+            return provideTypeForLeafref(leafref, parentNode);
+        } else if (typeDefinition instanceof IdentityrefTypeDefinition) {
+            final IdentityrefTypeDefinition idref = (IdentityrefTypeDefinition) typeDefinition;
+            return provideTypeForIdentityref(idref);
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Returns JAVA <code>Type</code> for instances of the type
+     * <code>ExtendedType</code>.
+     *
+     * @param typeDefinition
+     *            type definition which is converted to JAVA <code>Type</code>
+     * @return JAVA <code>Type</code> instance for <code>typeDefinition</code>
+     */
+    private Type javaTypeForExtendedType(final TypeDefinition<?> typeDefinition) {
+        final String typedefName = typeDefinition.getQName().getLocalName();
+        final TypeDefinition<?> baseTypeDef = baseTypeDefForExtendedType(typeDefinition);
+        Type returnType = javaTypeForLeafrefOrIdentityRef(baseTypeDef, typeDefinition);
+        if (returnType == null) {
+            if (baseTypeDef instanceof EnumTypeDefinition) {
+                final EnumTypeDefinition enumTypeDef = (EnumTypeDefinition) baseTypeDef;
+                returnType = provideTypeForEnum(enumTypeDef, typedefName, typeDefinition);
+            } else {
+                final Module module = findParentModule(schemaContext, typeDefinition);
+                Restrictions r = BindingGeneratorUtil.getRestrictions(typeDefinition);
+                if (module != null) {
+                    final Map<Date, Map<String, Type>> modulesByDate = genTypeDefsContextMap.get(module.getName());
+                    final Map<String, Type> genTOs = modulesByDate.get(module.getRevision());
+                    if (genTOs != null) {
+                        returnType = genTOs.get(typedefName);
+                    }
+                    if (returnType == null) {
+                        returnType = BaseYangTypes.BASE_YANG_TYPES_PROVIDER.javaTypeForSchemaDefinitionType(
+                                baseTypeDef, typeDefinition, r);
+                    }
+                }
+            }
+        }
+        return returnType;
+    }
+
+    /**
+     * Seeks for identity reference <code>idref</code> the JAVA
+     * <code>type</code>.<br />
+     * <br />
+     *
+     * <i>Example:<br />
+     * If identy which is referenced via <code>idref</code> has name <b>Idn</b>
+     * then returning type is <b>{@code Class<? extends Idn>}</b></i>
+     *
+     * @param idref
+     *            identityref type definition for which JAVA <code>Type</code>
+     *            is sought
+     * @return JAVA <code>Type</code> of the identity which is refrenced through
+     *         <code>idref</code>
+     */
+    private Type provideTypeForIdentityref(final IdentityrefTypeDefinition idref) {
+        QName baseIdQName = idref.getIdentity().getQName();
+        Module module = schemaContext.findModuleByNamespaceAndRevision(baseIdQName.getNamespace(),
+                baseIdQName.getRevision());
+        IdentitySchemaNode identity = null;
+        for (IdentitySchemaNode id : module.getIdentities()) {
+            if (id.getQName().equals(baseIdQName)) {
+                identity = id;
+            }
+        }
+        Preconditions.checkArgument(identity != null, "Target identity '" + baseIdQName + "' do not exists");
+
+        final String basePackageName = BindingMapping.getRootPackageName(module.getQNameModule());
+        final String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, identity.getPath());
+        final String genTypeName = BindingMapping.getClassName(identity.getQName());
+
+        Type baseType = Types.typeForClass(Class.class);
+        Type paramType = Types.wildcardTypeFor(packageName, genTypeName);
+        return Types.parameterizedTypeFor(baseType, paramType);
+    }
+
+    /**
+     * Converts <code>typeDefinition</code> to concrete JAVA <code>Type</code>.
+     *
+     * @param typeDefinition
+     *            type definition which should be converted to JAVA
+     *            <code>Type</code>
+     * @return JAVA <code>Type</code> which represents
+     *         <code>typeDefinition</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>typeDefinition</code> equal null</li>
+     *             <li>if Q name of <code>typeDefinition</code></li>
+     *             <li>if name of <code>typeDefinition</code></li>
+     *             </ul>
+     */
+    public Type generatedTypeForExtendedDefinitionType(final TypeDefinition<?> typeDefinition, final SchemaNode parentNode) {
+        Preconditions.checkArgument(typeDefinition != null, "Type Definition cannot be NULL!");
+        if (typeDefinition.getQName() == null) {
+            throw new IllegalArgumentException(
+                    "Type Definition cannot have non specified QName (QName cannot be NULL!)");
+        }
+        Preconditions.checkArgument(typeDefinition.getQName().getLocalName() != null,
+                "Type Definitions Local Name cannot be NULL!");
+
+        final TypeDefinition<?> baseTypeDef = baseTypeDefForExtendedType(typeDefinition);
+        if (!(baseTypeDef instanceof LeafrefTypeDefinition) && !(baseTypeDef instanceof IdentityrefTypeDefinition)) {
+            final Module module = findParentModule(schemaContext, parentNode);
+
+            if (module != null) {
+                final Map<Date, Map<String, Type>> modulesByDate = genTypeDefsContextMap.get(module.getName());
+                final Map<String, Type> genTOs = modulesByDate.get(module.getRevision());
+                if (genTOs != null) {
+                    return genTOs.get(typeDefinition.getQName().getLocalName());
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Gets base type definition for <code>extendTypeDef</code>. The method is
+     * recursively called until non <code>ExtendedType</code> type is found.
+     *
+     * @param extendTypeDef
+     *            type definition for which is the base type definition sought
+     * @return type definition which is base type for <code>extendTypeDef</code>
+     * @throws IllegalArgumentException
+     *             if <code>extendTypeDef</code> equal null
+     */
+    private static TypeDefinition<?> baseTypeDefForExtendedType(final TypeDefinition<?> extendTypeDef) {
+        Preconditions.checkArgument(extendTypeDef != null, "Type Definition reference cannot be NULL!");
+
+        TypeDefinition<?> ret = extendTypeDef;
+        while (ret.getBaseType() != null) {
+            ret = ret.getBaseType();
+        }
+
+        return ret;
+    }
+
+    /**
+     * Converts <code>leafrefType</code> to JAVA <code>Type</code>.
+     *
+     * The path of <code>leafrefType</code> is followed to find referenced node
+     * and its <code>Type</code> is returned.
+     *
+     * @param leafrefType
+     *            leafref type definition for which is the type sought
+     * @return JAVA <code>Type</code> of data schema node which is referenced in
+     *         <code>leafrefType</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>leafrefType</code> equal null</li>
+     *             <li>if path statement of <code>leafrefType</code> equal null</li>
+     *             </ul>
+     *
+     */
+    public Type provideTypeForLeafref(final LeafrefTypeDefinition leafrefType, final SchemaNode parentNode) {
+        Type returnType = null;
+        Preconditions.checkArgument(leafrefType != null, "Leafref Type Definition reference cannot be NULL!");
+
+        Preconditions.checkArgument(leafrefType.getPathStatement() != null,
+                "The Path Statement for Leafref Type Definition cannot be NULL!");
+
+        final RevisionAwareXPath xpath = leafrefType.getPathStatement();
+        final String strXPath = xpath.toString();
+
+        if (strXPath != null) {
+            if (strXPath.indexOf('[') == -1) {
+                final Module module = findParentModule(schemaContext, parentNode);
+                Preconditions.checkArgument(module != null, "Failed to find module for parent %s", parentNode);
+
+                final SchemaNode dataNode;
+                if (xpath.isAbsolute()) {
+                    dataNode = findDataSchemaNode(schemaContext, module, xpath);
+                } else {
+                    dataNode = findDataSchemaNodeForRelativeXPath(schemaContext, module, parentNode, xpath);
+                }
+                Preconditions.checkArgument(dataNode != null, "Failed to find leafref target: %s in module %s (%s)",
+                        strXPath, this.getParentModule(parentNode).getName(), parentNode.getQName().getModule());
+
+                if (leafContainsEnumDefinition(dataNode)) {
+                    returnType = referencedTypes.get(dataNode.getPath());
+                } else if (leafListContainsEnumDefinition(dataNode)) {
+                    returnType = Types.listTypeFor(referencedTypes.get(dataNode.getPath()));
+                } else {
+                    returnType = resolveTypeFromDataSchemaNode(dataNode);
+                }
+            } else {
+                returnType = Types.typeForClass(Object.class);
+            }
+        }
+        Preconditions.checkArgument(returnType != null, "Failed to find leafref target: %s in module %s (%s)",
+                strXPath, this.getParentModule(parentNode).getName(), parentNode.getQName().getModule(), this);
+        return returnType;
+    }
+
+    /**
+     * Checks if <code>dataNode</code> is <code>LeafSchemaNode</code> and if it
+     * so then checks if it is of type <code>EnumTypeDefinition</code>.
+     *
+     * @param dataNode
+     *            data schema node for which is checked if it is leaf and if it
+     *            is of enum type
+     * @return boolean value
+     *         <ul>
+     *         <li>true - if <code>dataNode</code> is leaf of type enumeration</li>
+     *         <li>false - other cases</li>
+     *         </ul>
+     */
+    private static boolean leafContainsEnumDefinition(final SchemaNode dataNode) {
+        if (dataNode instanceof LeafSchemaNode) {
+            final LeafSchemaNode leaf = (LeafSchemaNode) dataNode;
+            if (CompatUtils.compatLeafType(leaf) instanceof EnumTypeDefinition) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Checks if <code>dataNode</code> is <code>LeafListSchemaNode</code> and if
+     * it so then checks if it is of type <code>EnumTypeDefinition</code>.
+     *
+     * @param dataNode
+     *            data schema node for which is checked if it is leaflist and if
+     *            it is of enum type
+     * @return boolean value
+     *         <ul>
+     *         <li>true - if <code>dataNode</code> is leaflist of type
+     *         enumeration</li>
+     *         <li>false - other cases</li>
+     *         </ul>
+     */
+    private static boolean leafListContainsEnumDefinition(final SchemaNode dataNode) {
+        if (dataNode instanceof LeafListSchemaNode) {
+            final LeafListSchemaNode leafList = (LeafListSchemaNode) dataNode;
+            if (leafList.getType() instanceof EnumTypeDefinition) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Converts <code>enumTypeDef</code> to
+     * {@link Enumeration
+     * enumeration}.
+     *
+     * @param enumTypeDef
+     *            enumeration type definition which is converted to enumeration
+     * @param enumName
+     *            string with name which is used as the enumeration name
+     * @return enumeration type which is built with data (name, enum values)
+     *         from <code>enumTypeDef</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>enumTypeDef</code> equals null</li>
+     *             <li>if enum values of <code>enumTypeDef</code> equal null</li>
+     *             <li>if Q name of <code>enumTypeDef</code> equal null</li>
+     *             <li>if name of <code>enumTypeDef</code> equal null</li>
+     *             </ul>
+     */
+    private Enumeration provideTypeForEnum(final EnumTypeDefinition enumTypeDef, final String enumName, final SchemaNode parentNode) {
+        Preconditions.checkArgument(enumTypeDef != null, "EnumTypeDefinition reference cannot be NULL!");
+        Preconditions.checkArgument(enumTypeDef.getValues() != null,
+                "EnumTypeDefinition MUST contain at least ONE value definition!");
+        Preconditions.checkArgument(enumTypeDef.getQName() != null, "EnumTypeDefinition MUST contain NON-NULL QName!");
+        Preconditions.checkArgument(enumTypeDef.getQName().getLocalName() != null,
+                "Local Name in EnumTypeDefinition QName cannot be NULL!");
+
+        final String enumerationName = BindingMapping.getClassName(enumName);
+
+        Module module = findParentModule(schemaContext, parentNode);
+        final String basePackageName = BindingMapping.getRootPackageName(module.getQNameModule());
+
+        final EnumerationBuilderImpl enumBuilder = new EnumerationBuilderImpl(basePackageName, enumerationName);
+        final String enumTypedefDescription = encodeAngleBrackets(enumTypeDef.getDescription());
+        enumBuilder.setDescription(enumTypedefDescription);
+        enumBuilder.setReference(enumTypeDef.getReference());
+        enumBuilder.setModuleName(module.getName());
+        enumBuilder.setSchemaPath(enumTypeDef.getPath().getPathFromRoot());
+        enumBuilder.updateEnumPairsFromEnumTypeDef(enumTypeDef);
+        return enumBuilder.toInstance(null);
+    }
+
+    /**
+     * Adds enumeration to <code>typeBuilder</code>. The enumeration data are
+     * taken from <code>enumTypeDef</code>.
+     *
+     * @param enumTypeDef
+     *            enumeration type definition is source of enumeration data for
+     *            <code>typeBuilder</code>
+     * @param enumName
+     *            string with the name of enumeration
+     * @param typeBuilder
+     *            generated type builder to which is enumeration added
+     * @return enumeration type which contains enumeration data form
+     *         <code>enumTypeDef</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>enumTypeDef</code> equals null</li>
+     *             <li>if enum values of <code>enumTypeDef</code> equal null</li>
+     *             <li>if Q name of <code>enumTypeDef</code> equal null</li>
+     *             <li>if name of <code>enumTypeDef</code> equal null</li>
+     *             <li>if name of <code>typeBuilder</code> equal null</li>
+     *             </ul>
+     *
+     */
+    private static Enumeration addInnerEnumerationToTypeBuilder(final EnumTypeDefinition enumTypeDef, final String enumName, final GeneratedTypeBuilderBase<?> typeBuilder) {
+        Preconditions.checkArgument(enumTypeDef != null, "EnumTypeDefinition reference cannot be NULL!");
+        Preconditions.checkArgument(enumTypeDef.getValues() != null,
+                "EnumTypeDefinition MUST contain at least ONE value definition!");
+        Preconditions.checkArgument(enumTypeDef.getQName() != null, "EnumTypeDefinition MUST contain NON-NULL QName!");
+        Preconditions.checkArgument(enumTypeDef.getQName().getLocalName() != null,
+                "Local Name in EnumTypeDefinition QName cannot be NULL!");
+        Preconditions.checkArgument(typeBuilder != null, "Generated Type Builder reference cannot be NULL!");
+
+        final String enumerationName = BindingMapping.getClassName(enumName);
+
+        final EnumBuilder enumBuilder = typeBuilder.addEnumeration(enumerationName);
+        final String enumTypedefDescription = encodeAngleBrackets(enumTypeDef.getDescription());
+        enumBuilder.setDescription(enumTypedefDescription);
+        enumBuilder.updateEnumPairsFromEnumTypeDef(enumTypeDef);
+        return enumBuilder.toInstance(enumBuilder);
+    }
+
+    /**
+     * Converts <code>dataNode</code> to JAVA <code>Type</code>.
+     *
+     * @param dataNode
+     *            contains information about YANG type
+     * @return JAVA <code>Type</code> representation of <code>dataNode</code>
+     */
+    private Type resolveTypeFromDataSchemaNode(final SchemaNode dataNode) {
+        Type returnType = null;
+        if (dataNode != null) {
+            if (dataNode instanceof LeafSchemaNode) {
+                final LeafSchemaNode leaf = (LeafSchemaNode) dataNode;
+                final TypeDefinition<?> type = CompatUtils.compatLeafType(leaf);
+                returnType = javaTypeForSchemaDefinitionType(type, leaf);
+            } else if (dataNode instanceof LeafListSchemaNode) {
+                final LeafListSchemaNode leafList = (LeafListSchemaNode) dataNode;
+                returnType = javaTypeForSchemaDefinitionType(leafList.getType(), leafList);
+            }
+        }
+        return returnType;
+    }
+
+    /**
+     * Passes through all modules and through all its type definitions and
+     * convert it to generated types.
+     *
+     * The modules are firstly sorted by mutual dependencies. The modules are
+     * sequentially passed. All type definitions of a module are at the
+     * beginning sorted so that type definition with less amount of references
+     * to other type definition are processed first.<br />
+     * For each module is created mapping record in the map
+     * {@link TypeProviderImpl#genTypeDefsContextMap genTypeDefsContextMap}
+     * which map current module name to the map which maps type names to
+     * returned types (generated types).
+     *
+     */
+    private void resolveTypeDefsFromContext() {
+        final Set<Module> modules = schemaContext.getModules();
+        Preconditions.checkArgument(modules != null, "Set of Modules cannot be NULL!");
+        final Module[] modulesArray = new Module[modules.size()];
+        int i = 0;
+        for (Module modul : modules) {
+            modulesArray[i++] = modul;
+        }
+        final List<Module> modulesSortedByDependency = org.opendaylight.yangtools.yang.parser.util.ModuleDependencySort
+                .sort(modulesArray);
+
+        for (final Module module : modulesSortedByDependency) {
+            Map<Date, Map<String, Type>> dateTypeMap = genTypeDefsContextMap.get(module.getName());
+            if (dateTypeMap == null) {
+                dateTypeMap = new HashMap<>();
+            }
+            dateTypeMap.put(module.getRevision(), Collections.<String, Type>emptyMap());
+            genTypeDefsContextMap.put(module.getName(), dateTypeMap);
+        }
+
+        for (final Module module : modulesSortedByDependency) {
+            if (module != null) {
+                final String basePackageName = BindingMapping.getRootPackageName(module.getQNameModule());
+                if (basePackageName != null) {
+                    final List<TypeDefinition<?>> typeDefinitions = TypedefResolver.getAllTypedefs(module);
+                    final List<TypeDefinition<?>> listTypeDefinitions = sortTypeDefinitionAccordingDepth(typeDefinitions);
+                    if (listTypeDefinitions != null) {
+                        for (final TypeDefinition<?> typedef : listTypeDefinitions) {
+                            typedefToGeneratedType(basePackageName, module, typedef);
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    /**
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param module
+     *            string with the name of the module for to which the
+     *            <code>typedef</code> belongs
+     * @param typedef
+     *            type definition of the node for which should be creted JAVA
+     *            <code>Type</code> (usually generated TO)
+     * @return JAVA <code>Type</code> representation of <code>typedef</code> or
+     *         <code>null</code> value if <code>basePackageName</code> or
+     *         <code>modulName</code> or <code>typedef</code> or Q name of
+     *         <code>typedef</code> equals <code>null</code>
+     */
+    private Type typedefToGeneratedType(final String basePackageName, final Module module, final TypeDefinition<?> typedef) {
+        final String moduleName = module.getName();
+        final Date moduleRevision = module.getRevision();
+        if ((basePackageName != null) && (moduleName != null) && (typedef != null) && (typedef.getQName() != null)) {
+            final String typedefName = typedef.getQName().getLocalName();
+            final TypeDefinition<?> innerTypeDefinition = typedef.getBaseType();
+            if (!(innerTypeDefinition instanceof LeafrefTypeDefinition)
+                    && !(innerTypeDefinition instanceof IdentityrefTypeDefinition)) {
+                Type returnType = null;
+                if (innerTypeDefinition.getBaseType() != null) {
+                    returnType = provideGeneratedTOFromExtendedType(typedef, innerTypeDefinition, basePackageName, module.getName());
+                } else if (innerTypeDefinition instanceof UnionTypeDefinition) {
+                    final GeneratedTOBuilder genTOBuilder = provideGeneratedTOBuilderForUnionTypeDef(basePackageName,
+                            (UnionTypeDefinition) innerTypeDefinition, typedefName, typedef);
+                    genTOBuilder.setTypedef(true);
+                    genTOBuilder.setIsUnion(true);
+                    addUnitsToGenTO(genTOBuilder, typedef.getUnits());
+                    makeSerializable((GeneratedTOBuilderImpl) genTOBuilder);
+                    returnType = genTOBuilder.toInstance();
+                    // union builder
+                    GeneratedTOBuilder unionBuilder = new GeneratedTOBuilderImpl(genTOBuilder.getPackageName(),
+                            genTOBuilder.getName() + "Builder");
+                    unionBuilder.setIsUnionBuilder(true);
+                    MethodSignatureBuilder method = unionBuilder.addMethod("getDefaultInstance");
+                    method.setReturnType(returnType);
+                    method.addParameter(Types.STRING, "defaultValue");
+                    method.setAccessModifier(AccessModifier.PUBLIC);
+                    method.setStatic(true);
+                    Set<Type> types = additionalTypes.get(module);
+                    if (types == null) {
+                        types = Sets.<Type> newHashSet(unionBuilder.toInstance());
+                        additionalTypes.put(module, types);
+                    } else {
+                        types.add(unionBuilder.toInstance());
+                    }
+                } else if (innerTypeDefinition instanceof EnumTypeDefinition) {
+                    // enums are automatically Serializable
+                    final EnumTypeDefinition enumTypeDef = (EnumTypeDefinition) innerTypeDefinition;
+                    // TODO units for typedef enum
+                    returnType = provideTypeForEnum(enumTypeDef, typedefName, typedef);
+                } else if (innerTypeDefinition instanceof BitsTypeDefinition) {
+                    final BitsTypeDefinition bitsTypeDefinition = (BitsTypeDefinition) innerTypeDefinition;
+                    final GeneratedTOBuilder genTOBuilder = provideGeneratedTOBuilderForBitsTypeDefinition(
+                            basePackageName, bitsTypeDefinition, typedefName, module.getName());
+                    genTOBuilder.setTypedef(true);
+                    addUnitsToGenTO(genTOBuilder, typedef.getUnits());
+                    makeSerializable((GeneratedTOBuilderImpl) genTOBuilder);
+                    returnType = genTOBuilder.toInstance();
+                } else {
+                    final Type javaType = javaTypeForSchemaDefinitionType(innerTypeDefinition, typedef);
+                    returnType = wrapJavaTypeIntoTO(basePackageName, typedef, javaType, module.getName());
+                }
+                if (returnType != null) {
+                    final Map<Date, Map<String, Type>> modulesByDate = genTypeDefsContextMap.get(moduleName);
+                    Map<String, Type> typeMap = modulesByDate.get(moduleRevision);
+                    if (typeMap != null) {
+                        if (typeMap.isEmpty()) {
+                            typeMap = new HashMap<>(4);
+                            modulesByDate.put(moduleRevision, typeMap);
+                        }
+                        typeMap.put(typedefName, returnType);
+                    }
+                    return returnType;
+                }
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Wraps base YANG type to generated TO.
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param typedef
+     *            type definition which is converted to the TO
+     * @param javaType
+     *            JAVA <code>Type</code> to which is <code>typedef</code> mapped
+     * @return generated transfer object which represent<code>javaType</code>
+     */
+    private static GeneratedTransferObject wrapJavaTypeIntoTO(final String basePackageName, final TypeDefinition<?> typedef, final Type javaType, final String moduleName) {
+        Preconditions.checkNotNull(javaType, "javaType cannot be null");
+        final String propertyName = "value";
+
+        final GeneratedTOBuilder genTOBuilder = typedefToTransferObject(basePackageName, typedef, moduleName);
+        genTOBuilder.setRestrictions(BindingGeneratorUtil.getRestrictions(typedef));
+        final GeneratedPropertyBuilder genPropBuilder = genTOBuilder.addProperty(propertyName);
+        genPropBuilder.setReturnType(javaType);
+        genTOBuilder.addEqualsIdentity(genPropBuilder);
+        genTOBuilder.addHashIdentity(genPropBuilder);
+        genTOBuilder.addToStringProperty(genPropBuilder);
+        if (typedef.getStatus() == Status.DEPRECATED) {
+            genTOBuilder.addAnnotation("", "Deprecated");
+        }
+        if (javaType instanceof ConcreteType && "String".equals(javaType.getName()) && typedef.getBaseType() != null) {
+            final List<String> regExps = resolveRegExpressionsFromTypedef(typedef);
+            addStringRegExAsConstant(genTOBuilder, regExps);
+        }
+        addUnitsToGenTO(genTOBuilder, typedef.getUnits());
+        genTOBuilder.setTypedef(true);
+        makeSerializable((GeneratedTOBuilderImpl) genTOBuilder);
+        return genTOBuilder.toInstance();
+    }
+
+    /**
+     * Converts output list of generated TO builders to one TO builder (first
+     * from list) which contains the remaining builders as its enclosing TO.
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param typedef
+     *            type definition which should be of type
+     *            <code>UnionTypeDefinition</code>
+     * @param typeDefName
+     *            string with name for generated TO
+     * @return generated TO builder with the list of enclosed generated TO
+     *         builders
+     */
+    public GeneratedTOBuilder provideGeneratedTOBuilderForUnionTypeDef(final String basePackageName,
+            final UnionTypeDefinition typedef, final String typeDefName, final SchemaNode parentNode) {
+        final List<GeneratedTOBuilder> builders = provideGeneratedTOBuildersForUnionTypeDef(basePackageName,
+                typedef, typeDefName, parentNode);
+        Preconditions.checkState(!builders.isEmpty(), "No GeneratedTOBuilder objects generated from union %s", typedef);
+
+        final GeneratedTOBuilder resultTOBuilder = builders.remove(0);
+        for (GeneratedTOBuilder genTOBuilder : builders) {
+            resultTOBuilder.addEnclosingTransferObject(genTOBuilder);
+        }
+
+        resultTOBuilder.addProperty("value").setReturnType(Types.CHAR_ARRAY);
+        return resultTOBuilder;
+    }
+
+    /**
+     * Converts <code>typedef</code> to generated TO with
+     * <code>typeDefName</code>. Every union type from <code>typedef</code> is
+     * added to generated TO builder as property.
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param typedef
+     *            type definition which should be of type
+     *            <code>UnionTypeDefinition</code>
+     * @param typeDefName
+     *            string with name for generated TO
+     * @return generated TO builder which represents <code>typedef</code>
+     * @throws NullPointerException
+     *             <ul>
+     *             <li>if <code>basePackageName</code> is null</li>
+     *             <li>if <code>typedef</code> is null</li>
+     *             <li>if Qname of <code>typedef</code> is null</li>
+     *             </ul>
+     */
+    public List<GeneratedTOBuilder> provideGeneratedTOBuildersForUnionTypeDef(final String basePackageName, final UnionTypeDefinition typedef, final String typeDefName, final SchemaNode parentNode) {
+        Preconditions.checkNotNull(basePackageName, "Base Package Name cannot be NULL!");
+        Preconditions.checkNotNull(typedef, "Type Definition cannot be NULL!");
+        Preconditions.checkNotNull(typedef.getQName(), "Type definition QName cannot be NULL!");
+
+        final List<GeneratedTOBuilder> generatedTOBuilders = new ArrayList<>();
+        final List<TypeDefinition<?>> unionTypes = typedef.getTypes();
+        final Module module = findParentModule(schemaContext, parentNode);
+
+        final GeneratedTOBuilderImpl unionGenTOBuilder;
+        if (typeDefName != null && !typeDefName.isEmpty()) {
+            final String typeName = BindingMapping.getClassName(typeDefName);
+            unionGenTOBuilder = new GeneratedTOBuilderImpl(basePackageName, typeName);
+            final String typedefDescription = encodeAngleBrackets(typedef.getDescription());
+            unionGenTOBuilder.setDescription(typedefDescription);
+            unionGenTOBuilder.setReference(typedef.getReference());
+            unionGenTOBuilder.setSchemaPath(typedef.getPath().getPathFromRoot());
+            unionGenTOBuilder.setModuleName(module.getName());
+        } else {
+            unionGenTOBuilder = typedefToTransferObject(basePackageName, typedef, module.getName());
+        }
+
+        generatedTOBuilders.add(unionGenTOBuilder);
+        unionGenTOBuilder.setIsUnion(true);
+        final List<String> regularExpressions = new ArrayList<String>();
+        for (final TypeDefinition<?> unionType : unionTypes) {
+            final String unionTypeName = unionType.getQName().getLocalName();
+            if (unionType.getBaseType() != null) {
+                resolveExtendedSubtypeAsUnion(unionGenTOBuilder, unionType, regularExpressions,
+                        parentNode);
+            } else if (unionType instanceof UnionTypeDefinition) {
+                generatedTOBuilders.addAll(resolveUnionSubtypeAsUnion(unionGenTOBuilder, (UnionTypeDefinition) unionType,
+                        basePackageName, parentNode));
+            } else if (unionType instanceof EnumTypeDefinition) {
+                final Enumeration enumeration = addInnerEnumerationToTypeBuilder((EnumTypeDefinition) unionType,
+                        unionTypeName, unionGenTOBuilder);
+                updateUnionTypeAsProperty(unionGenTOBuilder, enumeration, unionTypeName);
+            } else {
+                final Type javaType = javaTypeForSchemaDefinitionType(unionType, parentNode);
+                updateUnionTypeAsProperty(unionGenTOBuilder, javaType, unionTypeName);
+            }
+        }
+        if (!regularExpressions.isEmpty()) {
+            addStringRegExAsConstant(unionGenTOBuilder, regularExpressions);
+        }
+
+        storeGenTO(typedef, unionGenTOBuilder, parentNode);
+
+        return generatedTOBuilders;
+    }
+
+    /**
+     * Wraps code which handle case when union subtype is also of the type
+     * <code>UnionType</code>.
+     *
+     * In this case the new generated TO is created for union subtype (recursive
+     * call of method
+     * {@link #provideGeneratedTOBuildersForUnionTypeDef(String, UnionTypeDefinition,
+     * String, SchemaNode)}
+     * provideGeneratedTOBuilderForUnionTypeDef} and in parent TO builder
+     * <code>parentUnionGenTOBuilder</code> is created property which type is
+     * equal to new generated TO.
+     *
+     * @param parentUnionGenTOBuilder
+     *            generated TO builder to which is the property with the child
+     *            union subtype added
+     * @param basePackageName
+     *            string with the name of the module package
+     * @param unionSubtype
+     *            type definition which represents union subtype
+     * @return list of generated TO builders. The number of the builders can be
+     *         bigger one due to recursive call of
+     *         <code>provideGeneratedTOBuildersForUnionTypeDef</code> method.
+     */
+    private List<GeneratedTOBuilder> resolveUnionSubtypeAsUnion(final GeneratedTOBuilder parentUnionGenTOBuilder, final UnionTypeDefinition unionSubtype, final String basePackageName, final SchemaNode parentNode) {
+        final String newTOBuilderName = provideAvailableNameForGenTOBuilder(parentUnionGenTOBuilder.getName());
+        final List<GeneratedTOBuilder> subUnionGenTOBUilders = provideGeneratedTOBuildersForUnionTypeDef(
+                basePackageName, unionSubtype, newTOBuilderName, parentNode);
+
+        final GeneratedPropertyBuilder propertyBuilder;
+        propertyBuilder = parentUnionGenTOBuilder.addProperty(BindingMapping.getPropertyName(newTOBuilderName));
+        propertyBuilder.setReturnType(subUnionGenTOBUilders.get(0));
+        parentUnionGenTOBuilder.addEqualsIdentity(propertyBuilder);
+        parentUnionGenTOBuilder.addToStringProperty(propertyBuilder);
+
+        return subUnionGenTOBUilders;
+    }
+
+    /**
+     * Wraps code which handle case when union subtype is of the type
+     * <code>ExtendedType</code>.
+     *
+     * If TO for this type already exists it is used for the creation of the
+     * property in <code>parentUnionGenTOBuilder</code>. In other case the base
+     * type is used for the property creation.
+     *
+     * @param parentUnionGenTOBuilder
+     *            generated TO builder in which new property is created
+     * @param unionSubtype
+     *            type definition of the <code>ExtendedType</code> type which
+     *            represents union subtype
+     * @param regularExpressions
+     *            list of strings with the regular expressions
+     * @param parentNode
+     *            parent Schema Node for Extended Subtype
+     *
+     */
+    private void resolveExtendedSubtypeAsUnion(final GeneratedTOBuilder parentUnionGenTOBuilder, final TypeDefinition<?> unionSubtype, final List<String> regularExpressions, final SchemaNode parentNode) {
+        final String unionTypeName = unionSubtype.getQName().getLocalName();
+        final Type genTO = findGenTO(unionTypeName, unionSubtype);
+        if (genTO != null) {
+            updateUnionTypeAsProperty(parentUnionGenTOBuilder, genTO, genTO.getName());
+        } else {
+            final TypeDefinition<?> baseType = baseTypeDefForExtendedType(unionSubtype);
+            if (unionTypeName.equals(baseType.getQName().getLocalName())) {
+                final Type javaType = BaseYangTypes.BASE_YANG_TYPES_PROVIDER.javaTypeForSchemaDefinitionType(baseType,
+                        parentNode);
+                if (javaType != null) {
+                    updateUnionTypeAsProperty(parentUnionGenTOBuilder, javaType, unionTypeName);
+                }
+            }
+            if (baseType instanceof StringTypeDefinition) {
+                regularExpressions.addAll(resolveRegExpressionsFromTypedef(unionSubtype));
+            }
+        }
+    }
+
+    /**
+     * Searches for generated TO for <code>searchedTypeDef</code> type
+     * definition in {@link #genTypeDefsContextMap genTypeDefsContextMap}
+     *
+     * @param searchedTypeName
+     *            string with name of <code>searchedTypeDef</code>
+     * @return generated TO for <code>searchedTypeDef</code> or
+     *         <code>null</code> it it doesn't exist
+     */
+    private Type findGenTO(final String searchedTypeName, final SchemaNode parentNode) {
+        final Module typeModule = findParentModule(schemaContext, parentNode);
+        if (typeModule != null && typeModule.getName() != null) {
+            final Map<Date, Map<String, Type>> modulesByDate = genTypeDefsContextMap.get(typeModule.getName());
+            final Map<String, Type> genTOs = modulesByDate.get(typeModule.getRevision());
+            if (genTOs != null) {
+                return genTOs.get(searchedTypeName);
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Stores generated TO created from <code>genTOBuilder</code> for
+     * <code>newTypeDef</code> to {@link #genTypeDefsContextMap
+     * genTypeDefsContextMap} if the module for <code>newTypeDef</code> exists
+     *
+     * @param newTypeDef
+     *            type definition for which is <code>genTOBuilder</code> created
+     * @param genTOBuilder
+     *            generated TO builder which is converted to generated TO and
+     *            stored
+     */
+    private void storeGenTO(final TypeDefinition<?> newTypeDef, final GeneratedTOBuilder genTOBuilder, final SchemaNode parentNode) {
+        if (!(newTypeDef instanceof UnionTypeDefinition)) {
+            final Module parentModule = findParentModule(schemaContext, parentNode);
+            if (parentModule != null && parentModule.getName() != null) {
+                Map<Date, Map<String, Type>> modulesByDate = genTypeDefsContextMap.get(parentModule.getName());
+                Map<String, Type> genTOsMap = modulesByDate.get(parentModule.getRevision());
+                genTOsMap.put(newTypeDef.getQName().getLocalName(), genTOBuilder.toInstance());
+            }
+        }
+    }
+
+    /**
+     * Adds a new property with the name <code>propertyName</code> and with type
+     * <code>type</code> to <code>unonGenTransObject</code>.
+     *
+     * @param unionGenTransObject
+     *            generated TO to which should be property added
+     * @param type
+     *            JAVA <code>type</code> of the property which should be added
+     *            to <code>unionGentransObject</code>
+     * @param propertyName
+     *            string with name of property which should be added to
+     *            <code>unionGentransObject</code>
+     */
+    private static void updateUnionTypeAsProperty(final GeneratedTOBuilder unionGenTransObject, final Type type, final String propertyName) {
+        if (unionGenTransObject != null && type != null && !unionGenTransObject.containsProperty(propertyName)) {
+            final GeneratedPropertyBuilder propBuilder = unionGenTransObject
+                    .addProperty(BindingMapping.getPropertyName(propertyName));
+            propBuilder.setReturnType(type);
+
+            unionGenTransObject.addEqualsIdentity(propBuilder);
+            unionGenTransObject.addHashIdentity(propBuilder);
+            unionGenTransObject.addToStringProperty(propBuilder);
+        }
+    }
+
+    /**
+     * Converts <code>typedef</code> to the generated TO builder.
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param typedef
+     *            type definition from which is the generated TO builder created
+     * @return generated TO builder which contains data from
+     *         <code>typedef</code> and <code>basePackageName</code>
+     */
+    private static GeneratedTOBuilderImpl typedefToTransferObject(final String basePackageName, final TypeDefinition<?> typedef, final String moduleName) {
+
+        final String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, typedef.getPath());
+        final String typeDefTOName = typedef.getQName().getLocalName();
+
+        if ((packageName != null) && (typeDefTOName != null)) {
+            final String genTOName = BindingMapping.getClassName(typeDefTOName);
+            final GeneratedTOBuilderImpl newType = new GeneratedTOBuilderImpl(packageName, genTOName);
+            final String typedefDescription = encodeAngleBrackets(typedef.getDescription());
+
+            newType.setDescription(typedefDescription);
+            newType.setReference(typedef.getReference());
+            newType.setSchemaPath(typedef.getPath().getPathFromRoot());
+            newType.setModuleName(moduleName);
+
+            return newType;
+        }
+        return null;
+    }
+
+    /**
+     * Converts <code>typeDef</code> which should be of the type
+     * <code>BitsTypeDefinition</code> to <code>GeneratedTOBuilder</code>.
+     *
+     * All the bits of the typeDef are added to returning generated TO as
+     * properties.
+     *
+     * @param basePackageName
+     *            string with name of package to which the module belongs
+     * @param typeDef
+     *            type definition from which is the generated TO builder created
+     * @param typeDefName
+     *            string with the name for generated TO builder
+     * @return generated TO builder which represents <code>typeDef</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>typeDef</code> equals null</li>
+     *             <li>if <code>basePackageName</code> equals null</li>
+     *             </ul>
+     */
+    public GeneratedTOBuilder provideGeneratedTOBuilderForBitsTypeDefinition(final String basePackageName, final TypeDefinition<?> typeDef, final String typeDefName, final String moduleName) {
+
+        Preconditions.checkArgument(typeDef != null, "typeDef cannot be NULL!");
+        Preconditions.checkArgument(basePackageName != null, "Base Package Name cannot be NULL!");
+
+        if (typeDef instanceof BitsTypeDefinition) {
+            BitsTypeDefinition bitsTypeDefinition = (BitsTypeDefinition) typeDef;
+
+            final String typeName = BindingMapping.getClassName(typeDefName);
+            final GeneratedTOBuilderImpl genTOBuilder = new GeneratedTOBuilderImpl(basePackageName, typeName);
+            final String typedefDescription = encodeAngleBrackets(typeDef.getDescription());
+
+            genTOBuilder.setDescription(typedefDescription);
+            genTOBuilder.setReference(typeDef.getReference());
+            genTOBuilder.setSchemaPath(typeDef.getPath().getPathFromRoot());
+            genTOBuilder.setModuleName(moduleName);
+            genTOBuilder.setBaseType(typeDef);
+
+            final List<Bit> bitList = bitsTypeDefinition.getBits();
+            GeneratedPropertyBuilder genPropertyBuilder;
+            for (final Bit bit : bitList) {
+                String name = bit.getName();
+                genPropertyBuilder = genTOBuilder.addProperty(BindingMapping.getPropertyName(name));
+                genPropertyBuilder.setReadOnly(true);
+                genPropertyBuilder.setReturnType(BaseYangTypes.BOOLEAN_TYPE);
+
+                genTOBuilder.addEqualsIdentity(genPropertyBuilder);
+                genTOBuilder.addHashIdentity(genPropertyBuilder);
+                genTOBuilder.addToStringProperty(genPropertyBuilder);
+            }
+
+            return genTOBuilder;
+        }
+        return null;
+    }
+
+    /**
+     * Converts the pattern constraints from <code>typedef</code> to the list of
+     * the strings which represents these constraints.
+     *
+     * @param typedef
+     *            extended type in which are the pattern constraints sought
+     * @return list of strings which represents the constraint patterns
+     * @throws IllegalArgumentException
+     *             if <code>typedef</code> equals null
+     *
+     */
+    private static List<String> resolveRegExpressionsFromTypedef(final TypeDefinition<?> typedef) {
+        Preconditions.checkArgument(typedef != null, "typedef can't be null");
+
+        final List<PatternConstraint> patternConstraints;
+        if (typedef instanceof StringTypeDefinition) {
+            // FIXME: run diff against base
+            patternConstraints = ((StringTypeDefinition) typedef).getPatternConstraints();
+        } else {
+            patternConstraints = ImmutableList.of();
+        }
+
+        final List<String> regExps = new ArrayList<>(patternConstraints.size());
+        for (PatternConstraint patternConstraint : patternConstraints) {
+            final String regEx = patternConstraint.getRegularExpression();
+            final String modifiedRegEx = StringEscapeUtils.escapeJava(regEx);
+            regExps.add(modifiedRegEx);
+        }
+
+        return regExps;
+    }
+
+    /**
+     *
+     * Adds to the <code>genTOBuilder</code> the constant which contains regular
+     * expressions from the <code>regularExpressions</code>
+     *
+     * @param genTOBuilder
+     *            generated TO builder to which are
+     *            <code>regular expressions</code> added
+     * @param regularExpressions
+     *            list of string which represent regular expressions
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>genTOBuilder</code> equals null</li>
+     *             <li>if <code>regularExpressions</code> equals null</li>
+     *             </ul>
+     */
+    private static void addStringRegExAsConstant(final GeneratedTOBuilder genTOBuilder, final List<String> regularExpressions) {
+        if (genTOBuilder == null) {
+            throw new IllegalArgumentException("Generated transfer object builder can't be null");
+        }
+        if (regularExpressions == null) {
+            throw new IllegalArgumentException("List of regular expressions can't be null");
+        }
+        if (!regularExpressions.isEmpty()) {
+            genTOBuilder.addConstant(Types.listTypeFor(BaseYangTypes.STRING_TYPE), TypeConstants.PATTERN_CONSTANT_NAME,
+                    regularExpressions);
+        }
+    }
+
+    /**
+     * Creates generated TO with data about inner extended type
+     * <code>innerExtendedType</code>, about the package name
+     * <code>typedefName</code> and about the generated TO name
+     * <code>typedefName</code>.
+     *
+     * It is supposed that <code>innerExtendedType</code> is already present in
+     * {@link TypeProviderImpl#genTypeDefsContextMap genTypeDefsContextMap} to
+     * be possible set it as extended type for the returning generated TO.
+     *
+     * @param typedef
+     *            Type Definition
+     * @param innerExtendedType
+     *            extended type which is part of some other extended type
+     * @param basePackageName
+     *            string with the package name of the module
+     * @param moduleName
+     *            Module Name
+     * @return generated TO which extends generated TO for
+     *         <code>innerExtendedType</code>
+     * @throws IllegalArgumentException
+     *             <ul>
+     *             <li>if <code>extendedType</code> equals null</li>
+     *             <li>if <code>basePackageName</code> equals null</li>
+     *             <li>if <code>typedefName</code> equals null</li>
+     *             </ul>
+     */
+    private GeneratedTransferObject provideGeneratedTOFromExtendedType(final TypeDefinition<?> typedef, final TypeDefinition<?> innerExtendedType, final String basePackageName, final String moduleName) {
+        Preconditions.checkArgument(innerExtendedType != null, "Extended type cannot be NULL!");
+        Preconditions.checkArgument(basePackageName != null, "String with base package name cannot be NULL!");
+
+        final String typedefName = typedef.getQName().getLocalName();
+        final String classTypedefName = BindingMapping.getClassName(typedefName);
+        final String innerTypeDef = innerExtendedType.getQName().getLocalName();
+        final GeneratedTOBuilderImpl genTOBuilder = new GeneratedTOBuilderImpl(basePackageName, classTypedefName);
+        final String typedefDescription = encodeAngleBrackets(typedef.getDescription());
+
+        genTOBuilder.setDescription(typedefDescription);
+        genTOBuilder.setReference(typedef.getReference());
+        genTOBuilder.setSchemaPath(typedef.getPath().getPathFromRoot());
+        genTOBuilder.setModuleName(moduleName);
+        genTOBuilder.setTypedef(true);
+        Restrictions r = BindingGeneratorUtil.getRestrictions(typedef);
+        genTOBuilder.setRestrictions(r);
+        if (typedef.getStatus() == Status.DEPRECATED) {
+            genTOBuilder.addAnnotation("", "Deprecated");
+        }
+
+        if (baseTypeDefForExtendedType(innerExtendedType) instanceof UnionTypeDefinition) {
+            genTOBuilder.setIsUnion(true);
+        }
+
+        Map<Date, Map<String, Type>> modulesByDate = null;
+        Map<String, Type> typeMap = null;
+        final Module parentModule = findParentModule(schemaContext, innerExtendedType);
+        if (parentModule != null) {
+            modulesByDate = genTypeDefsContextMap.get(parentModule.getName());
+            typeMap = modulesByDate.get(parentModule.getRevision());
+        }
+
+        if (typeMap != null) {
+            Type type = typeMap.get(innerTypeDef);
+            if (type instanceof GeneratedTransferObject) {
+                genTOBuilder.setExtendsType((GeneratedTransferObject) type);
+            }
+        }
+        addUnitsToGenTO(genTOBuilder, typedef.getUnits());
+        makeSerializable(genTOBuilder);
+
+        return genTOBuilder.toInstance();
+    }
+
+    /**
+     * Add {@link Serializable} to implemented interfaces of this TO. Also
+     * compute and add serialVersionUID property.
+     *
+     * @param gto
+     *            transfer object which needs to be serializable
+     */
+    private static void makeSerializable(final GeneratedTOBuilderImpl gto) {
+        gto.addImplementsType(Types.typeForClass(Serializable.class));
+        GeneratedPropertyBuilder prop = new GeneratedPropertyBuilderImpl("serialVersionUID");
+        prop.setValue(Long.toString(BindingGeneratorUtil.computeDefaultSUID(gto)));
+        gto.setSUID(prop);
+    }
+
+    /**
+     * Finds out for each type definition how many immersion (depth) is
+     * necessary to get to the base type. Every type definition is inserted to
+     * the map which key is depth and value is list of type definitions with
+     * equal depth. In next step are lists from this map concatenated to one
+     * list in ascending order according to their depth. All type definitions
+     * are in the list behind all type definitions on which depends.
+     *
+     * @param unsortedTypeDefinitions
+     *            list of type definitions which should be sorted by depth
+     * @return list of type definitions sorted according their each other
+     *         dependencies (type definitions which are depend on other type
+     *         definitions are in list behind them).
+     */
+    private static List<TypeDefinition<?>> sortTypeDefinitionAccordingDepth(
+            final Collection<TypeDefinition<?>> unsortedTypeDefinitions) {
+        List<TypeDefinition<?>> sortedTypeDefinition = new ArrayList<>();
+
+        Map<Integer, List<TypeDefinition<?>>> typeDefinitionsDepths = new TreeMap<>();
+        for (TypeDefinition<?> unsortedTypeDefinition : unsortedTypeDefinitions) {
+            final int depth = getTypeDefinitionDepth(unsortedTypeDefinition);
+            List<TypeDefinition<?>> typeDefinitionsConcreteDepth = typeDefinitionsDepths.get(depth);
+            if (typeDefinitionsConcreteDepth == null) {
+                typeDefinitionsConcreteDepth = new ArrayList<TypeDefinition<?>>();
+                typeDefinitionsDepths.put(depth, typeDefinitionsConcreteDepth);
+            }
+            typeDefinitionsConcreteDepth.add(unsortedTypeDefinition);
+        }
+
+        // SortedMap guarantees order corresponding to keys in ascending order
+        for (List<TypeDefinition<?>> v : typeDefinitionsDepths.values()) {
+            sortedTypeDefinition.addAll(v);
+        }
+
+        return sortedTypeDefinition;
+    }
+
+    /**
+     * Returns how many immersion is necessary to get from the type definition
+     * to the base type.
+     *
+     * @param typeDefinition
+     *            type definition for which is depth sought.
+     * @return number of immersions which are necessary to get from the type
+     *         definition to the base type
+     */
+    private static int getTypeDefinitionDepth(final TypeDefinition<?> typeDefinition) {
+        // FIXME: rewrite this in a non-recursive manner
+        if (typeDefinition == null) {
+            return 1;
+        }
+        TypeDefinition<?> baseType = typeDefinition.getBaseType();
+        if (baseType == null) {
+            return 1;
+        }
+
+        int depth = 1;
+        if (baseType.getBaseType() != null) {
+            depth = depth + getTypeDefinitionDepth(baseType);
+        } else if (baseType instanceof UnionTypeDefinition) {
+            List<TypeDefinition<?>> childTypeDefinitions = ((UnionTypeDefinition) baseType).getTypes();
+            int maxChildDepth = 0;
+            int childDepth = 1;
+            for (TypeDefinition<?> childTypeDefinition : childTypeDefinitions) {
+                childDepth = childDepth + getTypeDefinitionDepth(childTypeDefinition);
+                if (childDepth > maxChildDepth) {
+                    maxChildDepth = childDepth;
+                }
+            }
+            return maxChildDepth;
+        }
+        return depth;
+    }
+
+    /**
+     * Returns string which contains the same value as <code>name</code> but
+     * integer suffix is incremented by one. If <code>name</code> contains no
+     * number suffix then number 1 is added.
+     *
+     * @param name
+     *            string with name of augmented node
+     * @return string with the number suffix incremented by one (or 1 is added)
+     */
+    private static String provideAvailableNameForGenTOBuilder(final String name) {
+        Matcher mtch = NUMBERS_PATTERN.matcher(name);
+        if (mtch.find()) {
+            final int newSuffix = Integer.valueOf(name.substring(mtch.start())) + 1;
+            return name.substring(0, mtch.start()) + newSuffix;
+        } else {
+            return name + 1;
+        }
+    }
+
+    public static void addUnitsToGenTO(final GeneratedTOBuilder to, final String units) {
+        if (!Strings.isNullOrEmpty(units)) {
+            to.addConstant(Types.STRING, "_UNITS", "\"" + units + "\"");
+            GeneratedPropertyBuilder prop = new GeneratedPropertyBuilderImpl("UNITS");
+            prop.setReturnType(Types.STRING);
+            to.addToStringProperty(prop);
+        }
+    }
+
+    @Override
+    public String getTypeDefaultConstruction(final LeafSchemaNode node) {
+        return getTypeDefaultConstruction(node, node.getDefault());
+    }
+
+    public String getTypeDefaultConstruction(final LeafSchemaNode node, final String defaultValue) {
+        TypeDefinition<?> type = CompatUtils.compatLeafType(node);
+        QName typeQName = type.getQName();
+        TypeDefinition<?> base = baseTypeDefForExtendedType(type);
+        Preconditions.checkNotNull(type, "Cannot provide default construction for null type of %s", node);
+        Preconditions.checkNotNull(defaultValue, "Cannot provide default construction for null default statement of %s",
+                node);
+
+        StringBuilder sb = new StringBuilder();
+        String result = null;
+        if (base instanceof BinaryTypeDefinition) {
+            result = binaryToDef(defaultValue);
+        } else if (base instanceof BitsTypeDefinition) {
+            String parentName;
+            String className;
+            Module parent = getParentModule(node);
+            Iterator<QName> path = node.getPath().getPathFromRoot().iterator();
+            path.next();
+            if (!(path.hasNext())) {
+                parentName = BindingMapping.getClassName(parent.getName()) + "Data";
+                String basePackageName = BindingMapping.getRootPackageName(parent.getQNameModule());
+                className = basePackageName + "." + parentName + "." + BindingMapping.getClassName(node.getQName());
+            } else {
+                String basePackageName = BindingMapping.getRootPackageName(parent.getQNameModule());
+                String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, type.getPath());
+                parentName = BindingMapping.getClassName(parent.getName());
+                className = packageName + "." + parentName + "." + BindingMapping.getClassName(node.getQName());
+            }
+            result = bitsToDef((BitsTypeDefinition) base, className, defaultValue, type.getBaseType() != null);
+        } else if (base instanceof BooleanTypeDefinition) {
+            result = typeToBooleanDef(defaultValue);
+        } else if (base instanceof DecimalTypeDefinition) {
+            result = typeToDef(BigDecimal.class, defaultValue);
+        } else if (base instanceof EmptyTypeDefinition) {
+            result = typeToBooleanDef(defaultValue);
+        } else if (base instanceof EnumTypeDefinition) {
+            char[] defValArray = defaultValue.toCharArray();
+            char first = Character.toUpperCase(defaultValue.charAt(0));
+            defValArray[0] = first;
+            String newDefVal = new String(defValArray);
+            String className;
+            if (type.getBaseType() != null) {
+                Module m = getParentModule(type);
+                String basePackageName = BindingMapping.getRootPackageName(m.getQNameModule());
+                String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, type.getPath());
+                className = packageName + "." + BindingMapping.getClassName(typeQName);
+            } else {
+                Module parentModule = getParentModule(node);
+                String basePackageName = BindingMapping.getRootPackageName(parentModule.getQNameModule());
+                String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, node.getPath());
+                className = packageName + "." + BindingMapping.getClassName(node.getQName());
+            }
+            result = className + "." + newDefVal;
+        } else if (base instanceof IdentityrefTypeDefinition) {
+            throw new UnsupportedOperationException("Cannot get default construction for identityref type");
+        } else if (base instanceof InstanceIdentifierTypeDefinition) {
+            throw new UnsupportedOperationException("Cannot get default construction for instance-identifier type");
+        } else if (BaseTypes.isInt8(base)) {
+            result = typeToValueOfDef(Byte.class, defaultValue);
+        } else if (BaseTypes.isInt16(base)) {
+            result = typeToValueOfDef(Short.class, defaultValue);
+        } else if (BaseTypes.isInt32(base)) {
+            result = typeToValueOfDef(Integer.class, defaultValue);
+        } else if (BaseTypes.isInt64(base)) {
+            result = typeToValueOfDef(Long.class, defaultValue);
+        } else if (base instanceof LeafrefTypeDefinition) {
+            result = leafrefToDef(node, (LeafrefTypeDefinition) base, defaultValue);
+        } else if (base instanceof StringTypeDefinition) {
+            result = "\"" + defaultValue + "\"";
+        } else if (BaseTypes.isUint8(base)) {
+            result = typeToValueOfDef(Short.class, defaultValue);
+        } else if (BaseTypes.isUint16(base)) {
+            result = typeToValueOfDef(Integer.class, defaultValue);
+        } else if (BaseTypes.isUint32(base)) {
+            result = typeToValueOfDef(Long.class, defaultValue);
+        } else if (BaseTypes.isUint64(base)) {
+            switch (defaultValue) {
+                case "0":
+                    result = "java.math.BigInteger.ZERO";
+                    break;
+                case "1":
+                    result = "java.math.BigInteger.ONE";
+                    break;
+                case "10":
+                    result = "java.math.BigInteger.TEN";
+                    break;
+                default:
+                    result = typeToDef(BigInteger.class, defaultValue);
+            }
+        } else if (base instanceof UnionTypeDefinition) {
+            result = unionToDef(node);
+        } else {
+            result = "";
+        }
+        sb.append(result);
+
+        if (type.getBaseType() != null && !(base instanceof LeafrefTypeDefinition)
+                && !(base instanceof EnumTypeDefinition) && !(base instanceof UnionTypeDefinition)) {
+            Module m = getParentModule(type);
+            String basePackageName = BindingMapping.getRootPackageName(m.getQNameModule());
+            String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, type.getPath());
+            String className = packageName + "." + BindingMapping.getClassName(typeQName);
+            sb.insert(0, "new " + className + "(");
+            sb.insert(sb.length(), ')');
+        }
+
+        return sb.toString();
+    }
+
+    private static String typeToDef(final Class<?> clazz, final String defaultValue) {
+        return "new " + clazz.getName() + "(\"" + defaultValue + "\")";
+    }
+
+    private static String typeToValueOfDef(final Class<?> clazz, final String defaultValue) {
+        return clazz.getName() + ".valueOf(\"" + defaultValue + "\")";
+    }
+
+    private static String typeToBooleanDef(final String defaultValue) {
+        switch (defaultValue) {
+            case "false":
+                return "java.lang.Boolean.FALSE";
+            case "true":
+                return "java.lang.Boolean.TRUE";
+            default:
+                return typeToValueOfDef(Boolean.class, defaultValue);
+        }
+    }
+
+    private static String binaryToDef(final String defaultValue) {
+        StringBuilder sb = new StringBuilder();
+        BaseEncoding en = BaseEncoding.base64();
+        byte[] encoded = en.decode(defaultValue);
+        sb.append("new byte[] {");
+        for (int i = 0; i < encoded.length; i++) {
+            sb.append(encoded[i]);
+            if (i != encoded.length - 1) {
+                sb.append(", ");
+            }
+        }
+        sb.append('}');
+        return sb.toString();
+    }
+
+    private static final Comparator<Bit> BIT_NAME_COMPARATOR = (o1, o2) -> o1.getName().compareTo(o2.getName());
+
+    private static String bitsToDef(final BitsTypeDefinition type, final String className, final String defaultValue, final boolean isExt) {
+        List<Bit> bits = new ArrayList<>(type.getBits());
+        Collections.sort(bits, BIT_NAME_COMPARATOR);
+        StringBuilder sb = new StringBuilder();
+        if (!isExt) {
+            sb.append("new ");
+            sb.append(className);
+            sb.append('(');
+        }
+        for (int i = 0; i < bits.size(); i++) {
+            if (bits.get(i).getName().equals(defaultValue)) {
+                sb.append(true);
+            } else {
+                sb.append(false);
+            }
+            if (i != bits.size() - 1) {
+                sb.append(", ");
+            }
+        }
+        if (!isExt) {
+            sb.append(')');
+        }
+        return sb.toString();
+    }
+
+    private Module getParentModule(final SchemaNode node) {
+        QName qname = node.getPath().getPathFromRoot().iterator().next();
+        URI namespace = qname.getNamespace();
+        Date revision = qname.getRevision();
+        return schemaContext.findModuleByNamespaceAndRevision(namespace, revision);
+    }
+
+    private String leafrefToDef(final LeafSchemaNode parentNode, final LeafrefTypeDefinition leafrefType, final String defaultValue) {
+        Preconditions.checkArgument(leafrefType != null, "Leafref Type Definition reference cannot be NULL!");
+        Preconditions.checkArgument(leafrefType.getPathStatement() != null,
+                "The Path Statement for Leafref Type Definition cannot be NULL!");
+
+        final RevisionAwareXPath xpath = leafrefType.getPathStatement();
+        final String strXPath = xpath.toString();
+
+        if (strXPath != null) {
+            if (strXPath.indexOf('[') == -1) {
+                final Module module = findParentModule(schemaContext, parentNode);
+                if (module != null) {
+                    final SchemaNode dataNode;
+                    if (xpath.isAbsolute()) {
+                        dataNode = findDataSchemaNode(schemaContext, module, xpath);
+                    } else {
+                        dataNode = findDataSchemaNodeForRelativeXPath(schemaContext, module, parentNode, xpath);
+                    }
+                    String result = getTypeDefaultConstruction((LeafSchemaNode) dataNode, defaultValue);
+                    return result;
+                }
+            } else {
+                return "new java.lang.Object()";
+            }
+        }
+
+        return null;
+    }
+
+    private String unionToDef(final LeafSchemaNode node) {
+        final TypeDefinition<?> type = CompatUtils.compatLeafType(node);
+        String parentName;
+        String className;
+
+        if (type.getBaseType() != null) {
+            QName typeQName = type.getQName();
+            Module module = null;
+            Set<Module> modules = schemaContext.findModuleByNamespace(typeQName.getNamespace());
+            if (modules.size() > 1) {
+                for (Module m : modules) {
+                    if (m.getRevision().equals(typeQName.getRevision())) {
+                        module = m;
+                        break;
+                    }
+                }
+                if (module == null) {
+                    List<Module> modulesList = new ArrayList<>(modules);
+                    Collections.sort(modulesList, (o1, o2) -> o1.getRevision().compareTo(o2.getRevision()));
+                    module = modulesList.get(0);
+                }
+            } else {
+                module = modules.iterator().next();
+            }
+
+            String basePackageName = BindingMapping.getRootPackageName(module.getQNameModule());
+            className = basePackageName + "." + BindingMapping.getClassName(typeQName);
+        } else {
+            Iterator<QName> path = node.getPath().getPathFromRoot().iterator();
+            QName first = path.next();
+            if (!(path.hasNext())) {
+                URI namespace = first.getNamespace();
+                Date revision = first.getRevision();
+                Module parent = schemaContext.findModuleByNamespaceAndRevision(namespace, revision);
+                parentName = BindingMapping.getClassName((parent).getName()) + "Data";
+                String basePackageName = BindingMapping.getRootPackageName(parent.getQNameModule());
+                className = basePackageName + "." + parentName + "." + BindingMapping.getClassName(node.getQName());
+            } else {
+                URI namespace = first.getNamespace();
+                Date revision = first.getRevision();
+                Module parentModule = schemaContext.findModuleByNamespaceAndRevision(namespace, revision);
+                String basePackageName = BindingMapping.getRootPackageName(parentModule.getQNameModule());
+                String packageName = BindingGeneratorUtil.packageNameForGeneratedType(basePackageName, UNION_PATH);
+                className = packageName + "." + BindingMapping.getClassName(node.getQName());
+            }
+        }
+        return union(className, node.getDefault(), node);
+    }
+
+    private static String union(final String className, final String defaultValue, final LeafSchemaNode node) {
+        StringBuilder sb = new StringBuilder();
+        sb.append("new ");
+        sb.append(className);
+        sb.append("(\"");
+        sb.append(defaultValue);
+        sb.append("\".toCharArray())");
+        return sb.toString();
+    }
+
+    @Override
+    public String getConstructorPropertyName(final SchemaNode node) {
+        if (node instanceof TypeDefinition<?>) {
+            return "value";
+        } else {
+            return "";
+        }
+    }
+
+    @Override
+    public String getParamNameFromType(final TypeDefinition<?> type) {
+        return BindingMapping.getPropertyName(type.getQName().getLocalName());
+    }
+
+}