Added following mapping:
[controller.git] / opendaylight / sal / yang-prototype / code-generator / binding-java-api-generator / src / main / java / org / opendaylight / controller / sal / java / api / generator / GeneratorUtil.java
index 431835f6c09b3edbd401aba10f04037e8030f10f..16074c7e98ba0b1fac549c2c1fa6c42c67abe71c 100644 (file)
@@ -7,29 +7,16 @@
  */
 package org.opendaylight.controller.sal.java.api.generator;
 
-import static org.opendaylight.controller.sal.java.api.generator.Constants.CLASS;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.COMMA;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.ENUM;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.FINAL;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.GAP;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.IFC;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.LB;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.LCB;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.NL;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.PKG;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.PRIVATE;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.PUBLIC;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.RB;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.RCB;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.SC;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.STATIC;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.TAB;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.EXTENDS;
-import static org.opendaylight.controller.sal.java.api.generator.Constants.IMPLEMENTS;
+import static org.opendaylight.controller.sal.java.api.generator.Constants.*;
 
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
 import java.util.List;
+import java.util.Map;
 
+import org.opendaylight.controller.binding.generator.util.TypeConstants;
+import org.opendaylight.controller.binding.generator.util.Types;
 import org.opendaylight.controller.sal.binding.model.api.AnnotationType;
 import org.opendaylight.controller.sal.binding.model.api.Constant;
 import org.opendaylight.controller.sal.binding.model.api.Enumeration;
@@ -41,29 +28,32 @@ import org.opendaylight.controller.sal.binding.model.api.MethodSignature;
 import org.opendaylight.controller.sal.binding.model.api.MethodSignature.Parameter;
 import org.opendaylight.controller.sal.binding.model.api.ParameterizedType;
 import org.opendaylight.controller.sal.binding.model.api.Type;
+import org.opendaylight.controller.sal.binding.model.api.WildcardType;
 
-public class GeneratorUtil {
+public final class GeneratorUtil {
 
     private GeneratorUtil() {
     }
 
-    public static String createIfcDeclarationWithPkgName(
-            final GeneratedType genType, final String indent) {
-        return createFileDeclarationWithPkgName(IFC, genType, indent);
+    public static String createIfcDeclaration(final GeneratedType genType, final String indent,
+            final Map<String, LinkedHashMap<String, Integer>> availableImports) {
+        return createFileDeclaration(IFC, genType, indent, availableImports, false);
     }
 
-    public static String createClassDeclarationWithPkgName(
-            final GeneratedTransferObject genTransferObject, final String indent) {
-        return createFileDeclarationWithPkgName(CLASS, genTransferObject,
-                indent);
+    public static String createClassDeclaration(final GeneratedTransferObject genTransferObject, final String indent,
+            final Map<String, LinkedHashMap<String, Integer>> availableImports, boolean isIdentity) {
+        return createFileDeclaration(CLASS, genTransferObject, indent, availableImports, isIdentity);
     }
 
-    private static String createFileDeclarationWithPkgName(final String type,
-            final GeneratedType genType, final String indent) {
+    public static String createPackageDeclaration(final String packageName) {
+        return PKG + GAP + packageName + SC;
+    }
+
+    private static String createFileDeclaration(final String type, final GeneratedType genType, final String indent,
+            final Map<String, LinkedHashMap<String, Integer>> availableImports, boolean isIdentity) {
         final StringBuilder builder = new StringBuilder();
-        builder.append(PKG + GAP + genType.getPackageName() + SC);
-        builder.append(NL);
-        builder.append(NL);
+        final String currentPkg = genType.getPackageName();
+
         createComment(builder, genType.getComment(), indent);
 
         if (!genType.getAnnotations().isEmpty()) {
@@ -71,29 +61,38 @@ public class GeneratorUtil {
             appendAnnotations(builder, annotations);
             builder.append(NL);
         }
-        builder.append(PUBLIC + GAP + type + GAP + genType.getName() + GAP);
 
-        final List<GeneratedType> genImplements = genType.getImplements();
+        if (isIdentity) {
+            if (!(CLASS.equals(type))) {
+                throw new IllegalArgumentException("'identity' has to be generated as a class");
+            }
+            builder.append(PUBLIC + GAP + ABSTRACT + GAP + type + GAP + genType.getName() + GAP);
+        } else {
+            builder.append(PUBLIC + GAP + type + GAP + genType.getName() + GAP);
+        }
+
         if (genType instanceof GeneratedTransferObject) {
             GeneratedTransferObject genTO = (GeneratedTransferObject) genType;
 
             if (genTO.getExtends() != null) {
                 builder.append(EXTENDS + GAP);
-                builder.append(genTO.getExtends() + GAP);
+                String gtoString = getExplicitType(genTO.getExtends(), availableImports, currentPkg);
+                builder.append(gtoString + GAP);
             }
         }
+
+        final List<Type> genImplements = genType.getImplements();
         if (!genImplements.isEmpty()) {
             if (genType instanceof GeneratedTransferObject) {
                 builder.append(IMPLEMENTS + GAP);
             } else {
                 builder.append(EXTENDS + GAP);
             }
-            builder.append(genImplements.get(0).getPackageName()
-                    + "." + genImplements.get(0).getName());
+            builder.append(getExplicitType(genImplements.get(0), availableImports, currentPkg));
+
             for (int i = 1; i < genImplements.size(); ++i) {
                 builder.append(", ");
-                builder.append(genImplements.get(i).getPackageName()
-                        + "." + genImplements.get(i).getName());
+                builder.append(getExplicitType(genImplements.get(i), availableImports, currentPkg));
             }
         }
 
@@ -101,8 +100,7 @@ public class GeneratorUtil {
         return builder.toString();
     }
 
-    private static StringBuilder appendAnnotations(final StringBuilder builder,
-            final List<AnnotationType> annotations) {
+    private static StringBuilder appendAnnotations(final StringBuilder builder, final List<AnnotationType> annotations) {
         if ((builder != null) && (annotations != null)) {
             for (final AnnotationType annotation : annotations) {
                 builder.append("@");
@@ -112,8 +110,7 @@ public class GeneratorUtil {
 
                 if (annotation.containsParameters()) {
                     builder.append("(");
-                    final List<AnnotationType.Parameter> parameters = annotation
-                            .getParameters();
+                    final List<AnnotationType.Parameter> parameters = annotation.getParameters();
                     appendAnnotationParams(builder, parameters);
                     builder.append(")");
                 }
@@ -122,8 +119,7 @@ public class GeneratorUtil {
         return builder;
     }
 
-    private static StringBuilder appendAnnotationParams(
-            final StringBuilder builder,
+    private static StringBuilder appendAnnotationParams(final StringBuilder builder,
             final List<AnnotationType.Parameter> parameters) {
         if (parameters != null) {
             int i = 0;
@@ -156,28 +152,52 @@ public class GeneratorUtil {
         return builder;
     }
 
-    public static String createConstant(final Constant constant,
-            final String indent) {
+    public static String createConstant(final Constant constant, final String indent,
+            final Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
         final StringBuilder builder = new StringBuilder();
+        if (constant == null)
+            throw new IllegalArgumentException();
         builder.append(indent + PUBLIC + GAP + STATIC + GAP + FINAL + GAP);
-        builder.append(getExplicitType(constant.getType()) + GAP
-                + constant.getName());
+        builder.append(getExplicitType(constant.getType(), availableImports, currentPkg) + GAP + constant.getName());
         builder.append(GAP + "=" + GAP);
-        builder.append(constant.getValue() + SC);
+        final Object constValue = constant.getValue();
+
+        if (constant.getName().equals(TypeConstants.PATTERN_CONSTANT_NAME)) {
+            if (constant.getName() == null || constant.getType() == null || constant.getValue() == null)
+                throw new IllegalArgumentException();
+            if (constValue instanceof List) {
+                builder.append("Arrays.asList" + LB);
+                final List<?> constantValues = (List<?>) constValue;
+                int stringsCount = 0;
+                for (Object value : constantValues) {
+                    if (value instanceof String) {
+                        if (stringsCount > 0) {
+                            builder.append(COMMA);
+                        }
+                        stringsCount++;
+                        builder.append(DOUBLE_QUOTE + (String) value + DOUBLE_QUOTE);
+                    }
+                }
+                builder.append(RB);
+            }
+        } else {
+            builder.append(constant.getValue());
+        }
+        builder.append(SC);
+
         return builder.toString();
     }
 
-    public static String createField(final GeneratedProperty property,
-            final String indent) {
+    public static String createField(final GeneratedProperty property, final String indent,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
         final StringBuilder builder = new StringBuilder();
-        builder.append(indent);
         if (!property.getAnnotations().isEmpty()) {
             final List<AnnotationType> annotations = property.getAnnotations();
             appendAnnotations(builder, annotations);
             builder.append(NL);
         }
         builder.append(indent + PRIVATE + GAP);
-        builder.append(getExplicitType(property.getReturnType()) + GAP
+        builder.append(getExplicitType(property.getReturnType(), availableImports, currentPkg) + GAP
                 + property.getName());
         builder.append(SC);
         return builder.toString();
@@ -190,14 +210,27 @@ public class GeneratorUtil {
      * @param indent
      * @return
      */
-    public static String createMethodDeclaration(final MethodSignature method,
-            final String indent) {
+    public static String createMethodDeclaration(final MethodSignature method, final String indent,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
+        final StringBuilder builder = new StringBuilder();
+
+        if (method == null) {
+            throw new IllegalArgumentException("Method Signature parameter MUST be specified and cannot be NULL!");
+        }
+
         final String comment = method.getComment();
-        final Type type = method.getReturnType();
         final String name = method.getName();
+        if (name == null) {
+            throw new IllegalStateException("Method Name cannot be NULL!");
+        }
+
+        final Type type = method.getReturnType();
+        if (type == null) {
+            throw new IllegalStateException("Method Return type cannot be NULL!");
+        }
+
         final List<Parameter> parameters = method.getParameters();
 
-        final StringBuilder builder = new StringBuilder();
         createComment(builder, comment, indent);
         builder.append(NL);
         builder.append(indent);
@@ -208,7 +241,7 @@ public class GeneratorUtil {
             builder.append(NL);
         }
 
-        builder.append(indent + getExplicitType(type) + GAP + name);
+        builder.append(indent + getExplicitType(type, availableImports, currentPkg) + GAP + name);
         builder.append(LB);
         for (int i = 0; i < parameters.size(); i++) {
             Parameter p = parameters.get(i);
@@ -216,8 +249,7 @@ public class GeneratorUtil {
             if (i + 1 == parameters.size()) {
                 separator = "";
             }
-            builder.append(getExplicitType(p.getType()) + GAP + p.getName()
-                    + separator);
+            builder.append(getExplicitType(p.getType(), availableImports, currentPkg) + GAP + p.getName() + separator);
         }
         builder.append(RB);
         builder.append(SC);
@@ -225,33 +257,35 @@ public class GeneratorUtil {
         return builder.toString();
     }
 
-    public static String createConstructor(
-            GeneratedTransferObject genTransferObject, final String indent) {
+    public static String createConstructor(GeneratedTransferObject genTransferObject, final String indent,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, boolean isIdentity) {
         final StringBuilder builder = new StringBuilder();
 
-        final List<GeneratedProperty> properties = genTransferObject
-                .getProperties();
+        final String currentPkg = genTransferObject.getPackageName();
+        final List<GeneratedProperty> properties = genTransferObject.getProperties();
         final List<GeneratedProperty> ctorParams = new ArrayList<GeneratedProperty>();
-        for (final GeneratedProperty property : properties) {
-            if (property.isReadOnly()) {
-                ctorParams.add(property);
+        if (properties != null) {
+            for (final GeneratedProperty property : properties) {
+                if (property.isReadOnly()) {
+                    ctorParams.add(property);
+                }
             }
         }
-        
+
         builder.append(indent);
-        builder.append(PUBLIC);
+        builder.append(isIdentity ? PROTECTED : PUBLIC);
         builder.append(GAP);
         builder.append(genTransferObject.getName());
         builder.append(LB);
-        
+
         if (!ctorParams.isEmpty()) {
-            builder.append(getExplicitType(ctorParams.get(0).getReturnType()));
+            builder.append(getExplicitType(ctorParams.get(0).getReturnType(), availableImports, currentPkg));
             builder.append(" ");
             builder.append(ctorParams.get(0).getName());
             for (int i = 1; i < ctorParams.size(); ++i) {
                 final GeneratedProperty param = ctorParams.get(i);
                 builder.append(", ");
-                builder.append(getExplicitType(param.getReturnType()));
+                builder.append(getExplicitType(param.getReturnType(), availableImports, currentPkg));
                 builder.append(GAP);
                 builder.append(param.getName());
             }
@@ -269,13 +303,37 @@ public class GeneratorUtil {
                 builder.append(NL);
             }
         }
+        List<Constant> consts = genTransferObject.getConstantDefinitions();
+        for (Constant con : consts) {
+            if (con.getName() == null || con.getType() == null || con.getValue() == null)
+                continue;
+            if (con.getName().equals(TypeConstants.PATTERN_CONSTANT_NAME)) {
+                Object values = con.getValue();
+                if (values instanceof List) {
+                    for (Object regEx : (List<?>) values) {
+                        if (regEx instanceof String) {
+                            builder.append(indent + TAB + "for (String regEx : " + TypeConstants.PATTERN_CONSTANT_NAME
+                                    + ") {" + NL);
+                            builder.append(indent + TAB + TAB + "this." + MEMBER_PATTERN_LIST
+                                    + ".add(Pattern.compile(regEx))" + SC + NL);
+                            builder.append(indent + TAB + RCB + NL);
+
+                            break;
+                        }
+                    }
+
+                }
+            }
+
+        }
+
         builder.append(indent);
         builder.append(RCB);
         return builder.toString();
     }
 
-    public static String createGetter(final GeneratedProperty property,
-            final String indent) {
+    public static String createGetter(final GeneratedProperty property, final String indent,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
         final StringBuilder builder = new StringBuilder();
 
         final Type type = property.getReturnType();
@@ -283,8 +341,7 @@ public class GeneratorUtil {
         final char first = Character.toUpperCase(varName.charAt(0));
         final String methodName = "get" + first + varName.substring(1);
 
-        builder.append(indent + PUBLIC + GAP + getExplicitType(type) + GAP
-                + methodName);
+        builder.append(indent + PUBLIC + GAP + getExplicitType(type, availableImports, currentPkg) + GAP + methodName);
         builder.append(LB + RB + LCB + NL);
 
         String currentIndent = indent + TAB;
@@ -294,9 +351,9 @@ public class GeneratorUtil {
         builder.append(indent + RCB);
         return builder.toString();
     }
-    
-    public static String createSetter(final GeneratedProperty property,
-            final String indent) {
+
+    public static String createSetter(final GeneratedProperty property, final String indent,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, String currentPkg) {
         final StringBuilder builder = new StringBuilder();
 
         final Type type = property.getReturnType();
@@ -304,26 +361,23 @@ public class GeneratorUtil {
         final char first = Character.toUpperCase(varName.charAt(0));
         final String methodName = "set" + first + varName.substring(1);
 
-        builder.append(indent + PUBLIC + GAP + "void" + GAP
-                + methodName);
-        builder.append(LB + getExplicitType(type) + GAP + varName + RB + LCB + NL);
+        builder.append(indent + PUBLIC + GAP + "void" + GAP + methodName);
+        builder.append(LB + getExplicitType(type, availableImports, currentPkg) + GAP + varName + RB + LCB + NL);
         String currentIndent = indent + TAB;
         builder.append(currentIndent + "this." + varName + " = " + varName + SC + NL);
         builder.append(indent + RCB);
         return builder.toString();
     }
 
-    public static String createHashCode(
-            final List<GeneratedProperty> properties, final String indent) {
+    public static String createHashCode(final List<GeneratedProperty> properties, final String indent) {
         StringBuilder builder = new StringBuilder();
         builder.append(indent + "public int hashCode() {" + NL);
         builder.append(indent + TAB + "final int prime = 31;" + NL);
         builder.append(indent + TAB + "int result = 1;" + NL);
-        
+
         for (GeneratedProperty property : properties) {
             String fieldName = property.getName();
-            builder.append(indent + TAB + "result = prime * result + (("
-                    + fieldName + " == null) ? 0 : " + fieldName
+            builder.append(indent + TAB + "result = prime * result + ((" + fieldName + " == null) ? 0 : " + fieldName
                     + ".hashCode());" + NL);
         }
 
@@ -332,12 +386,12 @@ public class GeneratorUtil {
         return builder.toString();
     }
 
-    public static String createEquals(final GeneratedTransferObject type,
-            final List<GeneratedProperty> properties, final String indent) {
+    public static String createEquals(final GeneratedTransferObject type, final List<GeneratedProperty> properties,
+            final String indent) {
         StringBuilder builder = new StringBuilder();
         final String indent1 = indent + TAB;
-        final String indent2 = indent + TAB + TAB;
-        final String indent3 = indent + TAB + TAB + TAB;
+        final String indent2 = indent1 + TAB;
+        final String indent3 = indent2 + TAB;
 
         builder.append(indent + "public boolean equals(Object obj) {" + NL);
         builder.append(indent1 + "if (this == obj) {" + NL);
@@ -350,19 +404,16 @@ public class GeneratorUtil {
         builder.append(indent2 + "return false;" + NL);
         builder.append(indent1 + "}" + NL);
 
-        String typeStr = type.getPackageName() + "." + type.getName();
-        builder.append(indent1 + typeStr + " other = (" + typeStr + ") obj;"
-                + NL);
+        String typeStr = type.getName();
+        builder.append(indent1 + typeStr + " other = (" + typeStr + ") obj;" + NL);
 
         for (GeneratedProperty property : properties) {
             String fieldName = property.getName();
             builder.append(indent1 + "if (" + fieldName + " == null) {" + NL);
-            builder.append(indent2 + "if (other." + fieldName + " != null) {"
-                    + NL);
+            builder.append(indent2 + "if (other." + fieldName + " != null) {" + NL);
             builder.append(indent3 + "return false;" + NL);
             builder.append(indent2 + "}" + NL);
-            builder.append(indent1 + "} else if (!" + fieldName
-                    + ".equals(other." + fieldName + ")) {" + NL);
+            builder.append(indent1 + "} else if (!" + fieldName + ".equals(other." + fieldName + ")) {" + NL);
             builder.append(indent2 + "return false;" + NL);
             builder.append(indent1 + "}" + NL);
         }
@@ -373,8 +424,8 @@ public class GeneratorUtil {
         return builder.toString();
     }
 
-    public static String createToString(final GeneratedTransferObject type,
-            final List<GeneratedProperty> properties, final String indent) {
+    public static String createToString(final GeneratedTransferObject type, final List<GeneratedProperty> properties,
+            final String indent) {
         StringBuilder builder = new StringBuilder();
         builder.append(indent);
         builder.append("public String toString() {");
@@ -411,7 +462,7 @@ public class GeneratorUtil {
                 builder.append(NL);
                 builder.append(indent);
                 builder.append(TAB);
-                builder.append("builder.append(\", ");
+                builder.append("builder.append(");
                 builder.append(property.getName());
                 builder.append(");");
             }
@@ -432,46 +483,87 @@ public class GeneratorUtil {
         return builder.toString();
     }
 
-    public static String createEnum(final Enumeration enumeration,
-            final String indent) {
-        final StringBuilder builder = new StringBuilder(indent + ENUM + GAP
-                + enumeration.getName() + GAP + LCB + NL);
+    public static String createEnum(final Enumeration enumeration, final String indent) {
+        if (enumeration == null || indent == null)
+            throw new IllegalArgumentException();
+        final StringBuilder builder = new StringBuilder(indent + PUBLIC + GAP + ENUM + GAP + enumeration.getName()
+                + GAP + LCB + NL);
 
-        String separator = COMMA;
+        String separator = COMMA + NL;
         final List<Pair> values = enumeration.getValues();
-        builder.append(indent + TAB);
+
         for (int i = 0; i < values.size(); i++) {
             if (i + 1 == values.size()) {
                 separator = SC;
             }
-            builder.append(values.get(i).getName() + separator);
+            builder.append(indent + TAB + values.get(i).getName() + LB + values.get(i).getValue() + RB + separator);
         }
         builder.append(NL);
+        builder.append(NL);
+        final String ENUMERATION_NAME = "value";
+        final String ENUMERATION_TYPE = "int";
+        builder.append(indent + TAB + ENUMERATION_TYPE + GAP + ENUMERATION_NAME + SC);
+        builder.append(NL);
+        builder.append(indent + TAB + PRIVATE + GAP + enumeration.getName() + LB + ENUMERATION_TYPE + GAP
+                + ENUMERATION_NAME + RB + GAP + LCB + NL);
+        builder.append(indent + TAB + TAB + "this." + ENUMERATION_NAME + GAP + "=" + GAP + ENUMERATION_NAME + SC + NL);
+        builder.append(indent + TAB + RCB + NL);
+
         builder.append(indent + RCB);
+        builder.append(NL);
         return builder.toString();
     }
 
-    private static String getExplicitType(final Type type) {
-        String packageName = type.getPackageName();
-        if (packageName.endsWith(".")) {
-            packageName = packageName.substring(0, packageName.length() - 1);
-        }
-        final StringBuilder builder = new StringBuilder(packageName + "."
-                + type.getName());
-        if (type instanceof ParameterizedType) {
-            ParameterizedType pType = (ParameterizedType) type;
-            Type[] pTypes = pType.getActualTypeArguments();
-            builder.append("<");
-            builder.append(getParameters(pTypes));
-            builder.append(">");
+    private static String getExplicitType(final Type type,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
+        if (type == null) {
+            throw new IllegalArgumentException("Type parameter MUST be specified and cannot be NULL!");
         }
-        if (builder.toString().equals("java.lang.Void")) {
-            return "void";
+        String packageName = type.getPackageName();
+
+        LinkedHashMap<String, Integer> imports = availableImports.get(type.getName());
+
+        if ((imports != null && packageName.equals(findMaxValue(imports).get(0))) || packageName.equals(currentPkg)) {
+            final StringBuilder builder = new StringBuilder(type.getName());
+            if (type instanceof ParameterizedType) {
+                ParameterizedType pType = (ParameterizedType) type;
+                Type[] pTypes = pType.getActualTypeArguments();
+                builder.append("<");
+                builder.append(getParameters(pTypes, availableImports, currentPkg));
+                builder.append(">");
+            }
+            if (builder.toString().equals("Void")) {
+                return "void";
+            }
+            return builder.toString();
+        } else {
+            final StringBuilder builder = new StringBuilder();
+            if (packageName.startsWith("java.lang")) {
+                builder.append(type.getName());
+            } else {
+                if (!packageName.isEmpty()) {
+                    builder.append(packageName + "." + type.getName());
+                } else {
+                    builder.append(type.getName());
+                }
+
+            }
+            if (type instanceof ParameterizedType) {
+                ParameterizedType pType = (ParameterizedType) type;
+                Type[] pTypes = pType.getActualTypeArguments();
+                builder.append("<");
+                builder.append(getParameters(pTypes, availableImports, currentPkg));
+                builder.append(">");
+            }
+            if (builder.toString().equals("Void")) {
+                return "void";
+            }
+            return builder.toString();
         }
-        return builder.toString();
     }
 
-    private static String getParameters(final Type[] pTypes) {
+    private static String getParameters(final Type[] pTypes,
+            Map<String, LinkedHashMap<String, Integer>> availableImports, String currentPkg) {
         final StringBuilder builder = new StringBuilder();
         for (int i = 0; i < pTypes.length; i++) {
             Type t = pTypes[i];
@@ -480,13 +572,36 @@ public class GeneratorUtil {
             if (i + 1 == pTypes.length) {
                 separator = "";
             }
-            builder.append(getExplicitType(t) + separator);
+
+            String wildcardParam = "";
+            if (t instanceof WildcardType) {
+                wildcardParam = "? extends ";
+            }
+
+            builder.append(wildcardParam + getExplicitType(t, availableImports, currentPkg) + separator);
         }
         return builder.toString();
     }
 
-    private static void createComment(final StringBuilder builder,
-            final String comment, final String indent) {
+    private static List<String> findMaxValue(LinkedHashMap<String, Integer> imports) {
+        final List<String> result = new ArrayList<String>();
+
+        int maxValue = 0;
+        int currentValue = 0;
+        for (Map.Entry<String, Integer> entry : imports.entrySet()) {
+            currentValue = entry.getValue();
+            if (currentValue > maxValue) {
+                result.clear();
+                result.add(entry.getKey());
+                maxValue = currentValue;
+            } else if (currentValue == maxValue) {
+                result.add(entry.getKey());
+            }
+        }
+        return result;
+    }
+
+    private static void createComment(final StringBuilder builder, final String comment, final String indent) {
         if (comment != null && comment.length() > 0) {
             builder.append(indent + "/*" + NL);
             builder.append(indent + comment + NL);
@@ -494,4 +609,119 @@ public class GeneratorUtil {
         }
     }
 
+    public static Map<String, LinkedHashMap<String, Integer>> createImports(GeneratedType genType) {
+        final Map<String, LinkedHashMap<String, Integer>> imports = new HashMap<String, LinkedHashMap<String, Integer>>();
+        final String genTypePkg = genType.getPackageName();
+
+        final List<Constant> constants = genType.getConstantDefinitions();
+        final List<MethodSignature> methods = genType.getMethodDefinitions();
+        List<Type> impl = genType.getImplements();
+
+        // IMPLEMENTATIONS
+        if (impl != null) {
+            for (Type t : impl) {
+                addTypeToImports(t, imports, genTypePkg);
+            }
+        }
+
+        // CONSTANTS
+        if (constants != null) {
+            for (Constant c : constants) {
+                Type ct = c.getType();
+                addTypeToImports(ct, imports, genTypePkg);
+            }
+        }
+
+        // METHODS
+        if (methods != null) {
+            for (MethodSignature m : methods) {
+                Type ct = m.getReturnType();
+                addTypeToImports(ct, imports, genTypePkg);
+                for (MethodSignature.Parameter p : m.getParameters()) {
+                    addTypeToImports(p.getType(), imports, genTypePkg);
+                }
+            }
+        }
+
+        // PROPERTIES
+        if (genType instanceof GeneratedTransferObject) {
+            GeneratedTransferObject genTO = (GeneratedTransferObject) genType;
+
+            List<GeneratedProperty> props = genTO.getProperties();
+            if (props != null) {
+                for (GeneratedProperty prop : props) {
+                    Type pt = prop.getReturnType();
+                    addTypeToImports(pt, imports, genTypePkg);
+                }
+            }
+        }
+
+        // REGULAR EXPRESSION
+        if (genType instanceof GeneratedTransferObject) {
+            if (isConstantInTO(TypeConstants.PATTERN_CONSTANT_NAME, (GeneratedTransferObject) genType)) {
+                addTypeToImports(Types.typeForClass(java.util.regex.Pattern.class), imports, genTypePkg);
+                addTypeToImports(Types.typeForClass(java.util.Arrays.class), imports, genTypePkg);
+                addTypeToImports(Types.typeForClass(java.util.ArrayList.class), imports, genTypePkg);
+            }
+        }
+
+        return imports;
+    }
+
+    private static void addTypeToImports(Type type, Map<String, LinkedHashMap<String, Integer>> importedTypes,
+            String genTypePkg) {
+        String typeName = type.getName();
+        String typePkg = type.getPackageName();
+        if (typePkg.startsWith("java.lang") || typePkg.equals(genTypePkg) || typePkg.isEmpty()) {
+            return;
+        }
+        LinkedHashMap<String, Integer> packages = importedTypes.get(typeName);
+        if (packages == null) {
+            packages = new LinkedHashMap<String, Integer>();
+            packages.put(typePkg, 1);
+            importedTypes.put(typeName, packages);
+        } else {
+            Integer occurrence = packages.get(typePkg);
+            if (occurrence == null) {
+                packages.put(typePkg, 1);
+            } else {
+                occurrence++;
+                packages.put(typePkg, occurrence);
+            }
+        }
+
+        if (type instanceof ParameterizedType) {
+            ParameterizedType pt = (ParameterizedType) type;
+            Type[] params = pt.getActualTypeArguments();
+            for (Type param : params) {
+                addTypeToImports(param, importedTypes, genTypePkg);
+            }
+        }
+    }
+
+    public static List<String> createImportLines(Map<String, LinkedHashMap<String, Integer>> imports) {
+        List<String> importLines = new ArrayList<String>();
+
+        for (Map.Entry<String, LinkedHashMap<String, Integer>> entry : imports.entrySet()) {
+            String typeName = entry.getKey();
+            LinkedHashMap<String, Integer> typePkgMap = entry.getValue();
+            String typePkg = typePkgMap.keySet().iterator().next();
+            importLines.add("import " + typePkg + "." + typeName + SC);
+        }
+        return importLines;
+    }
+
+    public static boolean isConstantInTO(String constName, GeneratedTransferObject genTO) {
+        if (constName == null || genTO == null)
+            throw new IllegalArgumentException();
+        List<Constant> consts = genTO.getConstantDefinitions();
+        for (Constant cons : consts) {
+            if (cons.getName().equals(constName)) {
+                return true;
+            }
+
+        }
+        return false;
+    }
+
 }