/*
 * 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.controller.sal.java.api.generator;

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;
import org.opendaylight.controller.sal.binding.model.api.Enumeration.Pair;
import org.opendaylight.controller.sal.binding.model.api.GeneratedProperty;
import org.opendaylight.controller.sal.binding.model.api.GeneratedTransferObject;
import org.opendaylight.controller.sal.binding.model.api.GeneratedType;
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 final class GeneratorUtil {

    private GeneratorUtil() {
    }

    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 createClassDeclaration(final GeneratedTransferObject genTransferObject, final String indent,
            final Map<String, LinkedHashMap<String, Integer>> availableImports, boolean isIdentity) {
        return createFileDeclaration(CLASS, genTransferObject, indent, availableImports, isIdentity);
    }

    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();
        final String currentPkg = genType.getPackageName();

        createComment(builder, genType.getComment(), indent);

        if (!genType.getAnnotations().isEmpty()) {
            final List<AnnotationType> annotations = genType.getAnnotations();
            appendAnnotations(builder, annotations);
            builder.append(NL);
        }

        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);
                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(getExplicitType(genImplements.get(0), availableImports, currentPkg));

            for (int i = 1; i < genImplements.size(); ++i) {
                builder.append(", ");
                builder.append(getExplicitType(genImplements.get(i), availableImports, currentPkg));
            }
        }

        builder.append(GAP + LCB);
        return builder.toString();
    }

    private static StringBuilder appendAnnotations(final StringBuilder builder, final List<AnnotationType> annotations) {
        if ((builder != null) && (annotations != null)) {
            for (final AnnotationType annotation : annotations) {
                builder.append("@");
                builder.append(annotation.getPackageName());
                builder.append(".");
                builder.append(annotation.getName());

                if (annotation.containsParameters()) {
                    builder.append("(");
                    final List<AnnotationType.Parameter> parameters = annotation.getParameters();
                    appendAnnotationParams(builder, parameters);
                    builder.append(")");
                }
            }
        }
        return builder;
    }

    private static StringBuilder appendAnnotationParams(final StringBuilder builder,
            final List<AnnotationType.Parameter> parameters) {
        if (parameters != null) {
            int i = 0;
            for (final AnnotationType.Parameter param : parameters) {
                if (param == null) {
                    continue;
                }
                if (i > 0) {
                    builder.append(", ");
                }
                final String paramName = param.getName();
                if (param.getValue() != null) {
                    builder.append(paramName);
                    builder.append(" = ");
                    builder.append(param.getValue());
                } else {
                    builder.append(paramName);
                    builder.append(" = {");
                    final List<String> values = param.getValues();
                    builder.append(values.get(0));
                    for (int j = 1; j < values.size(); ++j) {
                        builder.append(", ");
                        builder.append(values.get(j));
                    }
                    builder.append("}");
                }
                i++;
            }
        }
        return builder;
    }

    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(), availableImports, currentPkg) + GAP + constant.getName());
        builder.append(GAP + "=" + GAP);
        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,
            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
        final StringBuilder builder = new StringBuilder();
        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(), availableImports, currentPkg) + GAP
                + property.getName());
        builder.append(SC);
        return builder.toString();
    }

    /**
     * Create method declaration in interface.
     * 
     * @param method
     * @param indent
     * @return
     */
    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 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();

        createComment(builder, comment, indent);
        builder.append(NL);
        builder.append(indent);

        if (!method.getAnnotations().isEmpty()) {
            final List<AnnotationType> annotations = method.getAnnotations();
            appendAnnotations(builder, annotations);
            builder.append(NL);
        }

        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);
            String separator = COMMA;
            if (i + 1 == parameters.size()) {
                separator = "";
            }
            builder.append(getExplicitType(p.getType(), availableImports, currentPkg) + GAP + p.getName() + separator);
        }
        builder.append(RB);
        builder.append(SC);

        return builder.toString();
    }

    public static String createConstructor(GeneratedTransferObject genTransferObject, final String indent,
            Map<String, LinkedHashMap<String, Integer>> availableImports, boolean isIdentity) {
        final StringBuilder builder = new StringBuilder();

        final String currentPkg = genTransferObject.getPackageName();
        final List<GeneratedProperty> properties = genTransferObject.getProperties();
        final List<GeneratedProperty> ctorParams = new ArrayList<GeneratedProperty>();
        if (properties != null) {
            for (final GeneratedProperty property : properties) {
                if (property.isReadOnly()) {
                    ctorParams.add(property);
                }
            }
        }

        builder.append(indent);
        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(), 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(), availableImports, currentPkg));
                builder.append(GAP);
                builder.append(param.getName());
            }
        }
        builder.append(RB + GAP + LCB + NL + indent + TAB + "super();" + NL);
        if (!ctorParams.isEmpty()) {
            for (final GeneratedProperty property : ctorParams) {
                builder.append(indent);
                builder.append(TAB);
                builder.append("this.");
                builder.append(property.getName());
                builder.append(" = ");
                builder.append(property.getName());
                builder.append(SC);
                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,
            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
        final StringBuilder builder = new StringBuilder();

        final Type type = property.getReturnType();
        final String varName = property.getName();
        final char first = Character.toUpperCase(varName.charAt(0));
        final String methodName = "get" + first + varName.substring(1);

        builder.append(indent + PUBLIC + GAP + getExplicitType(type, availableImports, currentPkg) + GAP + methodName);
        builder.append(LB + RB + LCB + NL);

        String currentIndent = indent + TAB;

        builder.append(currentIndent + "return " + varName + SC + NL);

        builder.append(indent + RCB);
        return builder.toString();
    }

    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();
        final String varName = property.getName();
        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, 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) {
        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
                    + ".hashCode());" + NL);
        }

        builder.append(indent + TAB + "return result;" + NL);
        builder.append(indent + RCB + NL);
        return builder.toString();
    }

    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 = indent1 + TAB;
        final String indent3 = indent2 + TAB;

        builder.append(indent + "public boolean equals(Object obj) {" + NL);
        builder.append(indent1 + "if (this == obj) {" + NL);
        builder.append(indent2 + "return true;" + NL);
        builder.append(indent1 + "}" + NL);
        builder.append(indent1 + "if (obj == null) {" + NL);
        builder.append(indent2 + "return false;" + NL);
        builder.append(indent1 + "}" + NL);
        builder.append(indent1 + "if (getClass() != obj.getClass()) {" + NL);
        builder.append(indent2 + "return false;" + NL);
        builder.append(indent1 + "}" + 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(indent3 + "return false;" + NL);
            builder.append(indent2 + "}" + NL);
            builder.append(indent1 + "} else if (!" + fieldName + ".equals(other." + fieldName + ")) {" + NL);
            builder.append(indent2 + "return false;" + NL);
            builder.append(indent1 + "}" + NL);
        }

        builder.append(indent1 + "return true;" + NL);

        builder.append(indent + RCB + NL);
        return builder.toString();
    }

    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() {");
        builder.append(NL);
        builder.append(indent);
        builder.append(TAB);
        builder.append("StringBuilder builder = new StringBuilder();");
        builder.append(NL);
        builder.append(indent);
        builder.append(TAB);
        builder.append("builder.append(\"");
        builder.append(type.getName());
        builder.append(" [");

        boolean first = true;
        for (GeneratedProperty property : properties) {
            if (first) {
                builder.append(property.getName());
                builder.append("=\");");
                builder.append(NL);
                builder.append(indent);
                builder.append(TAB);
                builder.append("builder.append(");
                builder.append(property.getName());
                builder.append(");");
                first = false;
            } else {
                builder.append(NL);
                builder.append(indent);
                builder.append(TAB);
                builder.append("builder.append(\", ");
                builder.append(property.getName());
                builder.append("=\");");
                builder.append(NL);
                builder.append(indent);
                builder.append(TAB);
                builder.append("builder.append(");
                builder.append(property.getName());
                builder.append(");");
            }
        }
        builder.append(NL);
        builder.append(indent);
        builder.append(TAB);
        builder.append("builder.append(\"]\");");
        builder.append(NL);
        builder.append(indent);
        builder.append(TAB);
        builder.append("return builder.toString();");

        builder.append(NL);
        builder.append(indent);
        builder.append(RCB);
        builder.append(NL);
        return builder.toString();
    }

    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 + NL;
        final List<Pair> values = enumeration.getValues();

        for (int i = 0; i < values.size(); i++) {
            if (i + 1 == values.size()) {
                separator = SC;
            }
            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,
            Map<String, LinkedHashMap<String, Integer>> availableImports, final String currentPkg) {
        if (type == null) {
            throw new IllegalArgumentException("Type parameter MUST be specified and cannot be NULL!");
        }
        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();
        }
    }

    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];

            String separator = COMMA;
            if (i + 1 == pTypes.length) {
                separator = "";
            }

            String wildcardParam = "";
            if (t instanceof WildcardType) {
                wildcardParam = "? extends ";
            }

            builder.append(wildcardParam + getExplicitType(t, availableImports, currentPkg) + separator);
        }
        return builder.toString();
    }

    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);
            builder.append(indent + "*/" + NL);
        }
    }

    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;
    }

}