/*
 * Copyright 2016-present Open Networking Laboratory
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.onosproject.yangutils.translator.tojava.utils;

import org.onosproject.yangutils.datamodel.YangAtomicPath;
import org.onosproject.yangutils.datamodel.YangBit;
import org.onosproject.yangutils.datamodel.YangBits;
import org.onosproject.yangutils.datamodel.YangCompilerAnnotation;
import org.onosproject.yangutils.datamodel.YangEnum;
import org.onosproject.yangutils.datamodel.YangEnumeration;
import org.onosproject.yangutils.datamodel.YangNode;
import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangDataTypes;
import org.onosproject.yangutils.translator.tojava.JavaAttributeInfo;
import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
import org.onosproject.yangutils.utils.io.YangPluginConfig;
import org.onosproject.yangutils.utils.io.impl.JavaDocGen;

import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
import static org.onosproject.yangutils.translator.tojava.utils.BracketType.OPEN_CLOSE_BRACKET;
import static org.onosproject.yangutils.translator.tojava.utils.BracketType.OPEN_CLOSE_BRACKET_WITH_VALUE;
import static org.onosproject.yangutils.translator.tojava.utils.IndentationType.EIGHT_SPACE;
import static org.onosproject.yangutils.translator.tojava.utils.IndentationType.FOUR_SPACE;
import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getAugmentMapTypeString;
import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getAugmentedClassNameForDataMethods;
import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getCurNodeName;
import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getSetOfNodeIdentifiers;
import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getEnumJavaAttribute;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.AUGMENTED_MAP_ADD;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.AUGMENTED_MAP_GETTER;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.AUGMENTED_MAP_GET_VALUE;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.GETTER;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.MANAGER_METHODS;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.SETTER;
import static org.onosproject.yangutils.translator.tojava.utils.MethodBodyTypes.TO_STRING;
import static org.onosproject.yangutils.translator.tojava.utils.MethodClassTypes.CLASS_TYPE;
import static org.onosproject.yangutils.translator.tojava.utils.MethodClassTypes.INTERFACE_TYPE;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.brackets;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getCompareToString;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getGreaterThanCondition;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getIfConditionBegin;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getLesserThanCondition;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getNewInstance;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getOverRideString;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.getReturnString;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.ifAndAndCondition;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.ifConditionForIntInTypeDefConstructor;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.ifEqualEqualCondition;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.methodBody;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.methodClose;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.methodSignature;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.methodSignatureClose;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.multiAttrMethodSignature;
import static org.onosproject.yangutils.translator.tojava.utils.StringGenerator.signatureClose;
import static org.onosproject.yangutils.utils.UtilConstants.ADD;
import static org.onosproject.yangutils.utils.UtilConstants.ADD_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.AND;
import static org.onosproject.yangutils.utils.UtilConstants.ARRAY_LIST;
import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED;
import static org.onosproject.yangutils.utils.UtilConstants.BASE64;
import static org.onosproject.yangutils.utils.UtilConstants.BIG_INTEGER;
import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_DATA_TYPE;
import static org.onosproject.yangutils.utils.UtilConstants.BUILD;
import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_LOWER_CASE;
import static org.onosproject.yangutils.utils.UtilConstants.CASE;
import static org.onosproject.yangutils.utils.UtilConstants.CLASS;
import static org.onosproject.yangutils.utils.UtilConstants.CLASS_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
import static org.onosproject.yangutils.utils.UtilConstants.COLON;
import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
import static org.onosproject.yangutils.utils.UtilConstants.DECODE;
import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT;
import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT_CAPS;
import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
import static org.onosproject.yangutils.utils.UtilConstants.ELSE;
import static org.onosproject.yangutils.utils.UtilConstants.ELSE_IF;
import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_PARAMETER_FUNCTION_CALL;
import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.ENUM;
import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
import static org.onosproject.yangutils.utils.UtilConstants.EQUALS_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.FALSE;
import static org.onosproject.yangutils.utils.UtilConstants.FOR;
import static org.onosproject.yangutils.utils.UtilConstants.FOR_TYPE_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_METHOD_NAME;
import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_PARAM_NAME;
import static org.onosproject.yangutils.utils.UtilConstants.GET;
import static org.onosproject.yangutils.utils.UtilConstants.GET_DECODER;
import static org.onosproject.yangutils.utils.UtilConstants.GET_METHOD_PREFIX;
import static org.onosproject.yangutils.utils.UtilConstants.GOOGLE_MORE_OBJECT_METHOD_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.HASH;
import static org.onosproject.yangutils.utils.UtilConstants.HASH_CODE_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.IF;
import static org.onosproject.yangutils.utils.UtilConstants.INSTANCE_OF;
import static org.onosproject.yangutils.utils.UtilConstants.INT;
import static org.onosproject.yangutils.utils.UtilConstants.INTEGER_WRAPPER;
import static org.onosproject.yangutils.utils.UtilConstants.IS_SELECT_LEAF;
import static org.onosproject.yangutils.utils.UtilConstants.LEAF;
import static org.onosproject.yangutils.utils.UtilConstants.LEAF_IDENTIFIER;
import static org.onosproject.yangutils.utils.UtilConstants.LONG;
import static org.onosproject.yangutils.utils.UtilConstants.MAP;
import static org.onosproject.yangutils.utils.UtilConstants.MAX_RANGE;
import static org.onosproject.yangutils.utils.UtilConstants.MIN_RANGE;
import static org.onosproject.yangutils.utils.UtilConstants.NEW;
import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
import static org.onosproject.yangutils.utils.UtilConstants.NULL;
import static org.onosproject.yangutils.utils.UtilConstants.OBJ;
import static org.onosproject.yangutils.utils.UtilConstants.OBJECT;
import static org.onosproject.yangutils.utils.UtilConstants.OBJECT_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.OF;
import static org.onosproject.yangutils.utils.UtilConstants.ONE;
import static org.onosproject.yangutils.utils.UtilConstants.OPEN_CURLY_BRACKET;
import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
import static org.onosproject.yangutils.utils.UtilConstants.OP_PARAM;
import static org.onosproject.yangutils.utils.UtilConstants.OTHER;
import static org.onosproject.yangutils.utils.UtilConstants.OVERRIDE;
import static org.onosproject.yangutils.utils.UtilConstants.PARSE_INT;
import static org.onosproject.yangutils.utils.UtilConstants.PATTERN;
import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
import static org.onosproject.yangutils.utils.UtilConstants.PRIVATE;
import static org.onosproject.yangutils.utils.UtilConstants.PROCESS_SUBTREE_FILTERING;
import static org.onosproject.yangutils.utils.UtilConstants.PROTECTED;
import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
import static org.onosproject.yangutils.utils.UtilConstants.QUOTE_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
import static org.onosproject.yangutils.utils.UtilConstants.REPLACE_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.RETURN;
import static org.onosproject.yangutils.utils.UtilConstants.RPC_INPUT_VAR_NAME;
import static org.onosproject.yangutils.utils.UtilConstants.SCHEMA_NAME;
import static org.onosproject.yangutils.utils.UtilConstants.SELECT_ALL_CHILD;
import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLON;
import static org.onosproject.yangutils.utils.UtilConstants.SET_METHOD_PREFIX;
import static org.onosproject.yangutils.utils.UtilConstants.SET_SELECT_LEAF;
import static org.onosproject.yangutils.utils.UtilConstants.SINGLE_QUOTE;
import static org.onosproject.yangutils.utils.UtilConstants.SIXTEEN_SPACE_INDENTATION;
import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
import static org.onosproject.yangutils.utils.UtilConstants.SPLIT_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.SQUARE_BRACKETS;
import static org.onosproject.yangutils.utils.UtilConstants.STATIC;
import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
import static org.onosproject.yangutils.utils.UtilConstants.SUFFIX_S;
import static org.onosproject.yangutils.utils.UtilConstants.SWITCH;
import static org.onosproject.yangutils.utils.UtilConstants.THIS;
import static org.onosproject.yangutils.utils.UtilConstants.TMP_VAL;
import static org.onosproject.yangutils.utils.UtilConstants.TO;
import static org.onosproject.yangutils.utils.UtilConstants.TO_CAPS;
import static org.onosproject.yangutils.utils.UtilConstants.TRIM_STRING;
import static org.onosproject.yangutils.utils.UtilConstants.TRUE;
import static org.onosproject.yangutils.utils.UtilConstants.TWELVE_SPACE_INDENTATION;
import static org.onosproject.yangutils.utils.UtilConstants.TWENTY_SPACE_INDENTATION;
import static org.onosproject.yangutils.utils.UtilConstants.VALIDATE_RANGE;
import static org.onosproject.yangutils.utils.UtilConstants.VALUE;
import static org.onosproject.yangutils.utils.UtilConstants.VALUE_LEAF_SET;
import static org.onosproject.yangutils.utils.UtilConstants.VOID;
import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUGMENTED_INFO;
import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUGMENTED_INFO_LOWER_CASE;
import static org.onosproject.yangutils.utils.UtilConstants.ZERO;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILD_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.CONSTRUCTOR;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.DEFAULT_CONSTRUCTOR;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.FROM_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.MANAGER_SETTER_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.OF_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.SETTER_METHOD;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.TYPE_CONSTRUCTOR;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateForAddAugmentation;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateForBuilderMethod;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateForGetAugmentation;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateForGetMethodWithAttribute;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateForValidatorMethod;
import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getCamelCase;
import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getCapitalCase;
import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getSmallCase;
import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.trimAtLast;

/**
 * Represents generator for methods of generated files based on the file type.
 */
public final class MethodsGenerator {
    private static final String BITS_STRING_ARRAY_VAR = "bitsTemp";
    private static final String BIT_TEMP_VAR = "bitTemp";
    private static final String BIT_NAMES_VAR = "bitNames";
    private static final String BIT_NAME_VAR = "bitName";

    /**
     * Creates an instance of method generator.
     */
    private MethodsGenerator() {
    }

    /**
     * Returns the methods strings for builder interface.
     *
     * @param name attribute name
     * @return method string for builder interface
     */
    public static String parseBuilderInterfaceBuildMethodString(String name) {
        return getJavaDoc(BUILD_METHOD, name, false, null) +
                getBuildForInterface(name);
    }

    /**
     * Returns getter string.
     *
     * @param attr    attribute info
     * @param genType generated java files
     * @return getter string
     */
    public static String getGetterString(JavaAttributeInfo attr, int genType) {

        String returnType = getReturnType(attr);
        String attributeName = attr.getAttributeName();
        String appDataStructure = null;
        StringBuilder builder = new StringBuilder();
        if (attr.getCompilerAnnotation() != null) {
            appDataStructure =
                    attr.getCompilerAnnotation().getYangAppDataStructure()
                            .getDataStructure().name();
        }
        if (genType == GENERATE_SERVICE_AND_MANAGER) {
            builder.append(generateForGetMethodWithAttribute(returnType))
                    .append(getGetterForInterface(
                            attributeName, returnType, attr.isListAttr(),
                            genType, attr.getCompilerAnnotation()));

            return builder.toString();
        }

        builder.append(getJavaDoc(GETTER_METHOD, attributeName, attr
                .isListAttr(), appDataStructure))
                .append(getGetterForInterface(
                        attributeName, returnType, attr.isListAttr(),
                        genType, attr.getCompilerAnnotation()));

        return builder.toString();
    }

    /**
     * Returns setter string.
     *
     * @param attr      attribute info
     * @param className java class name
     * @param genType   generated java files
     * @return setter string
     */
    public static String getSetterString(JavaAttributeInfo attr,
                                         String className, int genType) {

        String attrType = getReturnType(attr);
        String attributeName = attr.getAttributeName();
        JavaDocGen.JavaDocType type;
        StringBuilder builder = new StringBuilder();
        if (genType == GENERATE_SERVICE_AND_MANAGER) {
            type = MANAGER_SETTER_METHOD;
        } else {
            type = SETTER_METHOD;
        }

        String appDataStructure = null;
        if (attr.getCompilerAnnotation() != null) {
            appDataStructure =
                    attr.getCompilerAnnotation().getYangAppDataStructure()
                            .getDataStructure().name();
        }
        builder.append(getJavaDoc(type, attributeName, attr.isListAttr(),
                                  appDataStructure))
                .append(getSetterForInterface(attributeName, attrType, className,
                                              attr.isListAttr(), genType,
                                              attr.getCompilerAnnotation()));
        return builder.toString();
    }

    /**
     * Returns constructor method string.
     *
     * @param name class name
     * @return constructor string
     */
    private static String getConstructorString(String name) {
        return getJavaDoc(CONSTRUCTOR, name, false, null);
    }

    /**
     * Returns default constructor method string.
     *
     * @param name         class name
     * @param modifierType modifier type
     * @return default constructor string
     */
    public static String getDefaultConstructorString(String name,
                                                     String modifierType) {
        return getJavaDoc(DEFAULT_CONSTRUCTOR, name, false, null)
                + getDefaultConstructor(name, modifierType) + NEW_LINE;
    }

    /**
     * Returns build method string.
     *
     * @param name       class name
     * @param isRootNode if root node
     * @return build string
     */
    public static String getBuildString(String name, boolean isRootNode) {
        if (isRootNode) {
            return NEW_LINE + getBuild(name, true);
        }
        return FOUR_SPACE_INDENTATION + OVERRIDE + NEW_LINE +
                getBuild(name, false);
    }

    /**
     * Returns the getter method strings for class file.
     *
     * @param attr               attribute info
     * @param generatedJavaFiles for the type of java file being generated
     * @return getter method for class
     */
    public static String getGetterForClass(JavaAttributeInfo attr,
                                           int generatedJavaFiles) {

        String attrQualifiedType = getReturnType(attr);
        String attributeName = attr.getAttributeName();

        if (!attr.isListAttr()) {
            return getGetter(attrQualifiedType, attributeName,
                             generatedJavaFiles);
        }
        String attrParam = StringGenerator.getListAttribute(attrQualifiedType,
                                                            attr.getCompilerAnnotation());
        return getGetter(attrParam, attributeName, generatedJavaFiles);
    }

    /**
     * Returns getter for attribute.
     *
     * @param type    return type
     * @param name    attribute name
     * @param genType generated java files
     * @return getter for attribute
     */
    static String getGetter(String type, String name, int genType) {
        StringBuilder builder = new StringBuilder();
        if (genType == GENERATE_SERVICE_AND_MANAGER) {
            //Append method signature.
            builder.append(methodSignature(getCapitalCase(name), GET,
                                           PUBLIC, null, type, null,
                                           CLASS_TYPE))
                    //Append method body.
                    .append(methodBody(MANAGER_METHODS, null, null,
                                       EIGHT_SPACE_INDENTATION, null,
                                       type, false))
                    .append(signatureClose())
                    //Append method close.
                    .append(methodClose(FOUR_SPACE));
            return builder.toString();
        }
        builder.append(methodSignature(name, EMPTY_STRING,
                                       PUBLIC, null, type, null,
                                       CLASS_TYPE))
                //Append method body.
                .append(methodBody(GETTER, name, name,
                                   EIGHT_SPACE_INDENTATION, null,
                                   type, false))
                .append(signatureClose())
                //Append method close.
                .append(methodClose(FOUR_SPACE));
        return builder.toString();
    }

    /**
     * Returns the setter method strings for class file.
     *
     * @param attr               attribute info
     * @param className          name of the class
     * @param generatedJavaFiles generated java files
     * @return setter method for class
     */
    public static String getSetterForClass(JavaAttributeInfo attr,
                                           String className,
                                           int generatedJavaFiles) {
        String attrQualifiedType = getReturnType(attr);
        String attributeName = attr.getAttributeName();
        boolean isTypeNull = false;
        if (attr.getAttributeType() == null) {
            isTypeNull = true;
        }
        if (!attr.isListAttr()) {
            return getSetter(className, attributeName, attrQualifiedType,
                             generatedJavaFiles, isTypeNull, false);
        }
        String attrParam = StringGenerator.getListAttribute(attrQualifiedType,
                                                            attr.getCompilerAnnotation());
        return getSetter(className, attributeName, attrParam,
                         generatedJavaFiles, isTypeNull, true);
    }

    /**
     * Returns setter for attribute.
     *
     * @param className  class name
     * @param name       attribute name
     * @param type       return type
     * @param isTypeNull if attribute type is null
     * @param isList     true if leaf-list
     * @return setter for attribute
     */
    private static String getSetter(String className, String name, String type,
                                    int genType,
                                    boolean isTypeNull, boolean isList) {
        StringBuilder builder = new StringBuilder();
        if (genType == GENERATE_SERVICE_AND_MANAGER) {
            //Append method signature.
            builder.append(methodSignature(getCapitalCase(name),
                                           SET_METHOD_PREFIX,
                                           PUBLIC, name, VOID, type,
                                           CLASS_TYPE))
                    //Append method body.
                    .append(methodBody(MANAGER_METHODS, null, null,
                                       EIGHT_SPACE_INDENTATION, null, null,
                                       false))
                    .append(methodClose(FOUR_SPACE));
            return builder.toString();
        }
        if (genType == GENERATE_EVENT_SUBJECT_CLASS) {
            builder.append(methodSignature(name, EMPTY_STRING, PUBLIC, name, VOID,
                                           type, CLASS_TYPE))

                    //Append method body.
                    .append(methodBody(SETTER, name, name,
                                       EIGHT_SPACE_INDENTATION, null, null,
                                       false))
                    .append(methodClose(FOUR_SPACE));
            return builder.toString();
        }
        builder.append(methodSignature(name, EMPTY_STRING,
                                       PUBLIC, name, getCapitalCase(className) +
                                               BUILDER, type, CLASS_TYPE));
        if (!isTypeNull && !isList) {
            builder.append(StringGenerator.getValueLeafSetString(name));
        } else {
            builder.append(EMPTY_STRING);
        }
        //Append method body.
        builder.append(methodBody(SETTER, name, name,
                                  EIGHT_SPACE_INDENTATION, null, null,
                                  true))
                //Append method close.
                .append(methodClose(FOUR_SPACE));
        return builder.toString();
    }

    /**
     * Returns the setter method strings for class file.
     *
     * @param attr attribute info
     * @return setter method for class
     */
    static String getSetterForTypeDefClass(JavaAttributeInfo attr) {

        String attrQualifiedType = getReturnType(attr);
        String attributeName = attr.getAttributeName();
        return getTypeDefSetter(attrQualifiedType, attributeName);
    }

    /**
     * Returns type def's setter for attribute.
     *
     * @param type data type
     * @param name attribute name
     * @return setter for type def's attribute
     */
    private static String getTypeDefSetter(String type, String name) {
        return methodSignature(getCapitalCase(name), SET_METHOD_PREFIX, PUBLIC,
                               name, VOID, type, CLASS_TYPE) +
                methodBody(SETTER, name, name, EIGHT_SPACE_INDENTATION, null,
                           null, false) + methodClose(FOUR_SPACE);
    }

    /**
     * Returns the getter method strings for interface file.
     *
     * @param yangName   name of the attribute
     * @param returnType return type of attribute
     * @param isList     is list attribute
     * @param genType    generated java files
     * @param annotation compiler annotation
     * @return getter method for interface
     */
    static String getGetterForInterface(String yangName, String returnType,
                                        boolean isList,
                                        int genType,
                                        YangCompilerAnnotation annotation) {
        if (!isList) {
            return getGetterInterfaceString(returnType, yangName,
                                            genType);
        }
        String listAttr = StringGenerator.getListAttribute(returnType, annotation);
        return getGetterInterfaceString(listAttr, yangName, genType);
    }

    /**
     * Returns getter for attribute in interface.
     *
     * @param returnType return type
     * @param yangName   attribute name
     * @return getter for interface
     */
    private static String getGetterInterfaceString(String returnType,
                                                   String yangName,
                                                   int genType) {
        switch (genType) {
            case GENERATE_SERVICE_AND_MANAGER:
                return getGetMethodWithArgument(returnType, yangName);
            default:
                return methodSignature(yangName, EMPTY_STRING, null,
                                       null, returnType, null, INTERFACE_TYPE);
        }
    }

    /**
     * Returns the setter method strings for interface file.
     *
     * @param attrName   name of the attribute
     * @param attrType   return type of attribute
     * @param className  name of the java class being generated
     * @param isList     is list attribute
     * @param genType    generated java files
     * @param annotation compiler annotations
     * @return setter method for interface
     */
    static String getSetterForInterface(String attrName, String attrType,
                                        String className,
                                        boolean isList, int genType,
                                        YangCompilerAnnotation annotation) {
        if (!isList) {
            return getSetterInterfaceString(className, attrName, attrType,
                                            genType);
        }

        String listAttr = StringGenerator.getListAttribute(attrType, annotation);
        return getSetterInterfaceString(className, attrName, listAttr, genType);
    }

    /**
     * Returns setter string for interface.
     *
     * @param name     class name
     * @param attrName attribute name
     * @param attrType attribute type
     * @return setter string
     */
    private static String getSetterInterfaceString(String name,
                                                   String attrName,
                                                   String attrType,
                                                   int genType) {
        if (genType == GENERATE_SERVICE_AND_MANAGER) {
            return methodSignature(getCapitalCase(attrName),
                                   SET_METHOD_PREFIX,
                                   null, attrName, VOID, attrType +
                                           OP_PARAM, INTERFACE_TYPE);
        }
        return methodSignature(attrName, EMPTY_STRING, null,
                               attrName, name + BUILDER, attrType, INTERFACE_TYPE);
    }

    /**
     * Returns return type for attribute.
     *
     * @param attr attribute info
     * @return return type
     */
    private static String getReturnType(JavaAttributeInfo attr) {
        String returnType;
        StringBuilder builder = new StringBuilder();
        if (attr.isQualifiedName() &&
                attr.getImportInfo().getPkgInfo() != null) {
            returnType = attr.getImportInfo().getPkgInfo() + PERIOD;
            builder.append(returnType);
        }
        returnType = attr.getImportInfo().getClassInfo();
        builder.append(returnType);
        return builder.toString();
    }

    /**
     * Returns the build method strings for interface file.
     *
     * @param yangName name of the interface
     * @return build method for interface
     */
    static String getBuildForInterface(String yangName) {
        return methodSignature(BUILD, EMPTY_STRING, null, null,
                               yangName, null, INTERFACE_TYPE);
    }

    /**
     * Returns constructor string for impl class.
     *
     * @param yangName   class name
     * @param isRootNode if root node
     * @return constructor string
     */
    static String getConstructorStart(String yangName,
                                      boolean isRootNode) {
        StringBuilder builder = new StringBuilder(
                getConstructorString(yangName));

        String name = getCapitalCase(yangName);
        String returnType = DEFAULT_CAPS + name;
        if (isRootNode) {
            returnType = name + OP_PARAM;
        }
        builder.append(methodSignature(
                returnType, EMPTY_STRING, PROTECTED, BUILDER_LOWER_CASE + OBJECT,
                null, name + BUILDER, CLASS_TYPE));
        return builder.toString();
    }

    /**
     * Returns the constructor strings for class file.
     *
     * @param attr    attribute info
     * @param genType generated java files
     * @return constructor for class
     */
    public static String getConstructor(JavaAttributeInfo attr, int genType) {
        String attrName = attr.getAttributeName();
        String attrCaps = getCapitalCase(attrName);
        switch (genType) {
            case GENERATE_SERVICE_AND_MANAGER:
                return methodBody(MethodBodyTypes.CONSTRUCTOR, attrName,
                                  attrCaps, EIGHT_SPACE_INDENTATION, GET, null,
                                  false);
            default:
                return methodBody(MethodBodyTypes.CONSTRUCTOR, attrName,
                                  attrName, EIGHT_SPACE_INDENTATION, EMPTY_STRING,
                                  null, false);
        }
    }

    /**
     * Returns the rpc strings for service interface.
     *
     * @param rpcName name of the rpc
     * @param input   name of input
     * @param output  name of output
     * @return rpc method string
     */
    public static String getRpcServiceMethod(String rpcName, String input,
                                             String output) {
        String inputVal = EMPTY_STRING;
        if (!input.equals(EMPTY_STRING)) {
            inputVal = RPC_INPUT_VAR_NAME;
        }
        return methodSignature(rpcName, EMPTY_STRING, null,
                               inputVal, output, input, INTERFACE_TYPE) +
                NEW_LINE;
    }

    /**
     * Returns the build method strings for class file.
     *
     * @param yangName   class name
     * @param isRootNode if root node
     * @return build method string for class
     */
    static String getBuild(String yangName, boolean isRootNode) {
        String type = DEFAULT_CAPS + yangName;
        if (isRootNode) {
            type = yangName + OP_PARAM;
        }
        return methodSignature(BUILD, EMPTY_STRING, PUBLIC, null,
                               yangName, null,
                               CLASS_TYPE) +
                methodBody(MethodBodyTypes.BUILD, type, BUILD,
                           EIGHT_SPACE_INDENTATION, EMPTY_STRING,
                           null, false) +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns the Default constructor strings for class file.
     *
     * @param name         name of the class
     * @param modifierType modifier type for default constructor
     * @return Default constructor for class
     */
    private static String getDefaultConstructor(String name,
                                                String modifierType) {
        return methodSignature(name, EMPTY_STRING, modifierType, null,
                               null, null, CLASS_TYPE) +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns to string method's open strings.
     *
     * @return string method's open string
     */
    static String getToStringMethodOpen() {
        String line;
        StringBuilder builder = new StringBuilder(getOverRideString());
        builder.append(methodSignature(TO + STRING_DATA_TYPE, EMPTY_STRING,
                                       PUBLIC, null, STRING_DATA_TYPE, null,
                                       CLASS_TYPE));
        line = getReturnString(GOOGLE_MORE_OBJECT_METHOD_STRING,
                               EIGHT_SPACE_INDENTATION) + NEW_LINE;
        builder.append(line);
        return builder.toString();
    }

    /**
     * Returns to string method's close string.
     *
     * @return to string method close string
     */
    static String getToStringMethodClose() {
        return TWELVE_SPACE_INDENTATION + PERIOD + TO + STRING_DATA_TYPE +
                brackets(OPEN_CLOSE_BRACKET, null, null) + signatureClose() +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns to string method for class.
     *
     * @param attr attribute info
     * @return to string method
     */
    public static String getToStringMethod(JavaAttributeInfo attr) {
        String attributeName = attr.getAttributeName();
        return methodBody(TO_STRING, attributeName, null,
                          TWELVE_SPACE_INDENTATION, null, null, false);
    }

    /**
     * Returns from string method's open string.
     *
     * @param className name of the class
     * @return from string method's open string
     */
    static String getFromStringMethodSignature(String className) {
        return getJavaDoc(FROM_METHOD, className, false, null) +
                methodSignature(FROM_STRING_METHOD_NAME, EMPTY_STRING, PUBLIC +
                                        SPACE + STATIC, FROM_STRING_PARAM_NAME,
                                className, STRING_DATA_TYPE,
                                CLASS_TYPE);
    }

    /**
     * Return from string method's close string.
     *
     * @return from string method's close string
     */
    static String getFromStringMethodClose() {
        return getReturnString(NULL, EIGHT_SPACE_INDENTATION) +
                signatureClose() + methodClose(FOUR_SPACE);
    }

    /**
     * Return from string method's body string.
     *
     * @param attr     attribute info
     * @param fromAttr attribute info for the from string wrapper
     *                 type
     * @return from string method's body string
     */
    public static String getFromStringMethod(JavaAttributeInfo attr,
                                             JavaAttributeInfo fromAttr) {

        return EIGHT_SPACE_INDENTATION + StringGenerator.getTrySubString() +
                StringGenerator.getNewLineAndSpace(TWELVE_SPACE_INDENTATION) +
                getParsedSubString(attr, fromAttr) +
                StringGenerator.getNewLineAndSpace(FOUR_SPACE_INDENTATION) +
                StringGenerator.getReturnOfSubString() +
                StringGenerator.getNewLineAndSpace(EIGHT_SPACE_INDENTATION) +
                StringGenerator.getCatchSubString() +
                StringGenerator.getNewLineAndSpace(EIGHT_SPACE_INDENTATION) +
                CLOSE_CURLY_BRACKET;
    }

    /**
     * Returns sub string with parsed statement for union's from string method.
     *
     * @param attr attribute info
     * @return sub string with parsed statement for union's from string method
     */
    private static String getParsedSubString(JavaAttributeInfo attr,
                                             JavaAttributeInfo fromStringAttr) {

        String targetDataType = getReturnType(attr);
        StringBuilder builder = new StringBuilder();
        YangDataTypes types = fromStringAttr.getAttributeType()
                .getDataType();
        switch (types) {
            case BITS:
                return getFromStringForBits(attr, (YangBits) fromStringAttr.getAttributeType()
                    .getDataTypeExtendedInfo());
            case BINARY:
                return targetDataType + SPACE + TMP_VAL + SPACE + EQUAL + SPACE +
                        BASE64 + PERIOD + GET_DECODER + OPEN_PARENTHESIS +
                        CLOSE_PARENTHESIS + PERIOD + DECODE + OPEN_PARENTHESIS +
                        FROM_STRING_PARAM_NAME + CLOSE_PARENTHESIS + SEMI_COLON
                        + NEW_LINE;
            default:
                return targetDataType + SPACE + TMP_VAL + SPACE + EQUAL +
                        SPACE + StringGenerator.getParseFromStringMethod(
                        targetDataType, fromStringAttr.getAttributeType()) +
                        OPEN_PARENTHESIS + FROM_STRING_PARAM_NAME +
                        CLOSE_PARENTHESIS + SEMI_COLON + NEW_LINE;
        }
    }

    /**
     * Returns hash code method open strings.
     *
     * @return hash code method open string
     */
    static String getHashCodeMethodOpen() {
        String line;
        StringBuilder builder = new StringBuilder(getOverRideString());
        builder.append(methodSignature(HASH_CODE_STRING, EMPTY_STRING, PUBLIC,
                                       null, INT, null, CLASS_TYPE));
        line = getReturnString(OBJECT_STRING + SUFFIX_S + PERIOD + HASH +
                                       OPEN_PARENTHESIS, EIGHT_SPACE_INDENTATION);
        builder.append(line);
        return builder.toString();
    }

    /**
     * Returns hash code methods close string.
     *
     * @param hashcodeString hash code string
     * @return to hash code method close string
     */
    static String getHashCodeMethodClose(String hashcodeString) {
        String[] array = {SPACE, COMMA};
        hashcodeString = trimAtLast(hashcodeString, array);
        return hashcodeString + CLOSE_PARENTHESIS + signatureClose() +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns hash code method for class.
     *
     * @param attr attribute info
     * @return hash code method
     */
    public static String getHashCodeMethod(JavaAttributeInfo attr) {
        return attr.getAttributeName() + COMMA + SPACE;
    }

    /**
     * Returns equals method open strings.
     *
     * @param className class name
     * @return equals method open string
     */
    static String getEqualsMethodOpen(String className) {
        return getOverRideString() +
                methodSignature(EQUALS_STRING, EMPTY_STRING, PUBLIC, OBJ,
                                BOOLEAN_DATA_TYPE, OBJECT_STRING,
                                CLASS_TYPE) +
                getEqualsMethodsCommonIfCondition() +
                getEqualsMethodsSpecificIfCondition(className);
    }

    /**
     * Returns equal methods if condition string.
     *
     * @return if condition string
     */
    private static String getEqualsMethodsCommonIfCondition() {
        return getIfConditionBegin(EIGHT_SPACE_INDENTATION, THIS + SPACE +
                EQUAL + EQUAL + SPACE + OBJ) + getReturnString(
                TRUE, TWELVE_SPACE_INDENTATION) + signatureClose()
                + methodClose(EIGHT_SPACE);
    }

    /**
     * Returns if condition for specific class object in equals method.
     *
     * @param className class name
     * @return if condition string
     */
    private static String getEqualsMethodsSpecificIfCondition(String className) {
        return EIGHT_SPACE_INDENTATION + IF + SPACE + OPEN_PARENTHESIS + OBJ +
                INSTANCE_OF + className + CLOSE_PARENTHESIS + SPACE +
                OPEN_CURLY_BRACKET + NEW_LINE + TWELVE_SPACE_INDENTATION +
                className + SPACE + OTHER + SPACE + EQUAL + SPACE +
                OPEN_PARENTHESIS + className + CLOSE_PARENTHESIS + SPACE + OBJ +
                SEMI_COLON + NEW_LINE + TWELVE_SPACE_INDENTATION + RETURN +
                NEW_LINE;
    }

    /**
     * Returns equals methods close string.
     *
     * @param equalMethodString equal method string
     * @return equals method close string
     */
    static String getEqualsMethodClose(String equalMethodString) {
        String[] array = {NEW_LINE, AND, AND, SPACE};
        equalMethodString = trimAtLast(equalMethodString, array) +
                signatureClose();
        return equalMethodString + methodClose(EIGHT_SPACE) +
                getReturnString(FALSE, EIGHT_SPACE_INDENTATION) +
                signatureClose() + methodClose(FOUR_SPACE);
    }

    /**
     * Returns equals method for class.
     *
     * @param attr attribute info
     * @return equals method
     */
    public static String getEqualsMethod(JavaAttributeInfo attr) {
        String attributeName = attr.getAttributeName();
        return SIXTEEN_SPACE_INDENTATION + OBJECT_STRING + SUFFIX_S +
                PERIOD + EQUALS_STRING + OPEN_PARENTHESIS + attributeName +
                COMMA + SPACE + OTHER + PERIOD + attributeName +
                CLOSE_PARENTHESIS + SPACE + AND + AND;
    }

    /**
     * Returns of method's string and java doc for special type.
     *
     * @param attr      attribute info
     * @param className class name
     * @return of method's string and java doc for special type
     */
    public static String getOfMethodStringAndJavaDoc(JavaAttributeInfo attr,
                                                     String className) {
        String attrType = getReturnType(attr);
        String attrName = attr.getAttributeName();

        return getJavaDoc(OF_METHOD, className + FOR_TYPE_STRING + attrName,
                          false, null) + getOfMethodString(attrType, className);
    }

    /**
     * Returns of method's string.
     *
     * @param type data type
     * @param name class name
     * @return of method's string
     */
    private static String getOfMethodString(String type, String name) {
        return methodSignature(OF, EMPTY_STRING, PUBLIC + SPACE + STATIC,
                               VALUE, name, type, CLASS_TYPE) +
                methodBody(MethodBodyTypes.OF_METHOD, name, null,
                           EIGHT_SPACE_INDENTATION, EMPTY_STRING, null, false) +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns string and java doc for constructor of type class.
     *
     * @param attr      attribute info
     * @param className class name
     * @return string and java doc for constructor of type class
     */
    public static String getTypeConstructorStringAndJavaDoc(
            JavaAttributeInfo attr, String className) {
        String attrType = getReturnType(attr);
        String attrName = attr.getAttributeName();
        return getJavaDoc(TYPE_CONSTRUCTOR, attrName, false, null) +
                getTypeConstructorString(attrType, attrName, className);
    }

    /**
     * Returns string and java doc for constructor of type class.
     *
     * @param attr1    first attribute info
     * @param attr2    second attribute info
     * @param genType  class name
     * @param type     conflict validate type
     * @param addFirst whether int came first or uInt came first
     * @return string and java doc for constructor of type class
     */
    public static String getTypeConstructorStringAndJavaDoc(
            JavaAttributeInfo attr1, JavaAttributeInfo attr2, String genType,
            ValidatorTypeForUnionTypes type, boolean addFirst) {

        String attrType = getReturnType(attr1);
        String attrName1 = "";
        String attrName2 = "";
        if (attr1 != null) {
            if (addFirst) {
                attrName1 = attr1.getAttributeName();
            } else {
                attrName2 = attr1.getAttributeName();
            }
        }
        if (attr2 != null) {
            if (addFirst) {
                attrName1 = attr2.getAttributeName();
            } else {
                attrName2 = attr2.getAttributeName();
            }
        }

        String appDataStructure = null;
        if (attr1 != null && attr1.getCompilerAnnotation() != null) {
            appDataStructure =
                    attr1.getCompilerAnnotation().getYangAppDataStructure()
                            .getDataStructure().name();
        }
        String doc;
        if (attrName1.isEmpty()) {
            doc = attrName2;
        } else {
            doc = attrName1;
        }
        return getJavaDoc(TYPE_CONSTRUCTOR, doc, false, appDataStructure) +
                getTypeConstructorString(attrType, attrName1,
                                         attrName2, genType,
                                         type, addFirst);
    }

    /**
     * Returns type constructor string.
     *
     * @param type      data type
     * @param name      attribute name
     * @param className class name
     * @return type constructor string
     */
    private static String getTypeConstructorString(String type, String name,
                                                   String className) {
        return methodSignature(className, EMPTY_STRING, PUBLIC, name,
                               null, type, CLASS_TYPE) +
                methodBody(SETTER, name, null, EIGHT_SPACE_INDENTATION,
                           EMPTY_STRING, null, false) + methodClose(FOUR_SPACE);
    }

    /**
     * Returns type constructor string.
     *
     * @param type      data type
     * @param attr1     attribute attr1
     * @param className class attr1
     * @return type constructor string
     */
    private static String getTypeConstructorString(
            String type, String attr1, String attr2, String className,
            ValidatorTypeForUnionTypes validatorType, boolean addInt) {

        StringBuilder constructor = new StringBuilder(
                methodSignature(className, EMPTY_STRING, null, type,
                                null, type, CLASS_TYPE))
                .append(ifConditionForIntInTypeDefConstructor(validatorType,
                                                              addInt))
                .append(methodBody(SETTER, attr1, null,
                                   TWELVE_SPACE_INDENTATION, EMPTY_STRING,
                                   null, false));
        String str = EIGHT_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + SPACE +
                ELSE + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
        constructor.append(str)
                .append(methodBody(SETTER, attr2, null,
                                   TWELVE_SPACE_INDENTATION, EMPTY_STRING,
                                   null, false))
                .append(methodClose(FOUR_SPACE))
                .append(methodClose(EIGHT_SPACE));

        return constructor.toString();
    }

    /**
     * Returns interface of add augmentation.
     *
     * @return interface of add augmentation
     */
    static String getAddAugmentInfoMethodInterface() {
        StringBuilder builder = new StringBuilder(generateForAddAugmentation());
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put(OBJECT_STRING, VALUE);
        map.put(CLASS_STRING, CLASS + OBJECT_STRING);
        builder.append(multiAttrMethodSignature(ADD_STRING + YANG_AUGMENTED_INFO,
                                                EMPTY_STRING, EMPTY_STRING,
                                                VOID, map, INTERFACE_TYPE));
        return builder.toString();
    }

    /**
     * Returns implementation of add augmentation.
     *
     * @return implementation of add augmentation
     */
    static String getAddAugmentInfoMethodImpl() {
        StringBuilder builder = new StringBuilder(getOverRideString());
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put(OBJECT_STRING, VALUE);
        map.put(CLASS_STRING, CLASS + OBJECT_STRING);
        builder.append(multiAttrMethodSignature(ADD_STRING + YANG_AUGMENTED_INFO,
                                                EMPTY_STRING, PUBLIC,
                                                VOID, map, CLASS_TYPE))
                .append(methodBody(AUGMENTED_MAP_ADD, null, null,
                                   EIGHT_SPACE_INDENTATION, null, null, false))
                .append(methodClose(FOUR_SPACE))
                .append(NEW_LINE);
        return builder.toString();
    }

    /**
     * Returns interface of get YANG augment info.
     *
     * @return interface of get YANG augment info
     */
    static String getYangAugmentInfoInterface() {
        return generateForGetAugmentation() +
                methodSignature(YANG_AUGMENTED_INFO_LOWER_CASE, EMPTY_STRING,
                                null, CLASS + OBJECT_STRING,
                                OBJECT_STRING, CLASS_STRING, INTERFACE_TYPE);
    }

    /**
     * Returns implementation of get YANG augment info.
     *
     * @return implementation of get YANG augment info
     */
    static String getYangAugmentInfoImpl() {
        return getOverRideString() +
                methodSignature(YANG_AUGMENTED_INFO_LOWER_CASE, EMPTY_STRING,
                                PUBLIC, CLASS + OBJECT_STRING, OBJECT_STRING,
                                CLASS_STRING, CLASS_TYPE) +
                methodBody(AUGMENTED_MAP_GET_VALUE, null, null,
                           EIGHT_SPACE_INDENTATION, null, null, false) +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns implementation of get YANG augment info.
     *
     * @return implementation of get YANG augment info
     */
    static String getYangAugmentInfoMapInterface() {
        return NEW_LINE +
                getJavaDoc(GETTER_METHOD, YANG_AUGMENTED_INFO_LOWER_CASE + MAP,
                           false, null) +
                methodSignature(YANG_AUGMENTED_INFO_LOWER_CASE + MAP,
                                EMPTY_STRING, null, null,
                                getAugmentMapTypeString(), null, INTERFACE_TYPE);
    }

    /**
     * Returns implementation of get YANG augment info.
     *
     * @return implementation of get YANG augment info
     */
    static String getYangAugmentInfoMapImpl() {
        return getOverRideString() + methodSignature(
                YANG_AUGMENTED_INFO_LOWER_CASE + MAP, EMPTY_STRING, PUBLIC, null,
                getAugmentMapTypeString(), null, CLASS_TYPE) +
                methodBody(AUGMENTED_MAP_GETTER, null, null,
                           EIGHT_SPACE_INDENTATION, null, null, false) +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns enum's constructor.
     *
     * @param className enum's class name
     * @return enum's constructor
     */
    static String getEnumsConstructor(String className) {
        StringBuilder builder = new StringBuilder();
        String clsName = getSmallCase(className);
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put(INT, clsName);
        map.put(STRING_DATA_TYPE, SCHEMA_NAME);
        builder.append(multiAttrMethodSignature(className, EMPTY_STRING,
                                                EMPTY_STRING, null,
                                                map, CLASS_TYPE))
                .append(methodBody(SETTER, clsName, EMPTY_STRING,
                                   EIGHT_SPACE_INDENTATION, EMPTY_STRING,
                                   EMPTY_STRING, false))
                .append(methodBody(SETTER, SCHEMA_NAME, EMPTY_STRING,
                                   EIGHT_SPACE_INDENTATION, EMPTY_STRING,
                                   EMPTY_STRING, false))
                .append(methodClose(FOUR_SPACE));

        return builder.toString();
    }

    /**
     * Returns of method for enum class.
     *
     * @param className class name
     * @param type      method body type
     * @return of method
     */
    static String getEnumsOfValueMethod(String className,
                                        YangEnumeration enumeration,
                                        MethodBodyTypes type) {
        String name = getCapitalCase(className);
        StringBuilder builder = new StringBuilder(getJavaDoc(
                OF_METHOD, name + SPACE + FOR,
                false, null));
        //Switch statement.
        String sw = EIGHT_SPACE_INDENTATION + SWITCH + SPACE + brackets(
                OPEN_CLOSE_BRACKET_WITH_VALUE, VALUE, null) +
                methodSignatureClose(CLASS_TYPE);
        String str;
        switch (type) {
            case ENUM_METHOD_INT_VALUE:
                builder.append(getEnumValueMethodSignature(name, INT))
                        .append(sw);
                for (YangEnum yangEnum : enumeration.getEnumSet()) {
                    str = getEnumJavaAttribute(yangEnum.getNamedValue())
                            .toUpperCase();
                    builder.append(getEnumValueMethodCases(
                            EMPTY_STRING + yangEnum.getValue(), str, name));
                }
                break;
            case ENUM_METHOD_STRING_VALUE:
                builder.append(getEnumValueMethodSignature(name,
                                                           STRING_DATA_TYPE))
                        .append(sw);
                for (YangEnum yangEnum : enumeration.getEnumSet()) {
                    str = getEnumJavaAttribute(yangEnum.getNamedValue())
                            .toUpperCase();
                    builder.append(getEnumValueMethodCases(
                            QUOTES + yangEnum.getNamedValue() + QUOTES, str,
                            name));
                }
                break;
            default:
                return null;
        }

        String method = TWELVE_SPACE_INDENTATION + DEFAULT + SPACE + COLON +
                NEW_LINE;
        builder.append(method)
                .append(getReturnString(NULL, SIXTEEN_SPACE_INDENTATION))
                .append(signatureClose())
                .append(methodClose(EIGHT_SPACE))
                .append(methodClose(FOUR_SPACE));

        return builder.toString();
    }

    /**
     * Returns enum value method signature.
     *
     * @param name method name
     * @param type param type
     * @return enum value method signature
     */
    private static String getEnumValueMethodSignature(String name, String type) {
        return methodSignature(OF, EMPTY_STRING, PUBLIC + SPACE +
                STATIC, VALUE, name, type, CLASS_TYPE);
    }

    /**
     * Returns enum value method's cases.
     *
     * @param caseType case type
     * @param value    return value
     * @param name     name of class
     * @return enum value method's cases
     */
    private static String getEnumValueMethodCases(String caseType, String value,
                                                  String name) {
        return TWELVE_SPACE_INDENTATION + CASE + SPACE + caseType +
                COLON + NEW_LINE + getReturnString(name,
                                                   SIXTEEN_SPACE_INDENTATION) +
                PERIOD + value + signatureClose();
    }

    /**
     * Returns augmented data getter and setter methods for service class.
     *
     * @param parent parent node
     * @return augmented data getter and setter methods for service class
     */
    static String getAugmentsDataMethodForService(YangNode parent) {
        List<YangAtomicPath> targets = getSetOfNodeIdentifiers(parent);
        YangNode augmentedNode;
        String curNodeName;
        String method;
        StringBuilder methods = new StringBuilder();
        String parentName;
        String returnType;
        YangNode methodNode;
        YangPluginConfig pluginConfig =
                ((JavaFileInfoContainer) parent).getJavaFileInfo()
                        .getPluginConfig();
        for (YangAtomicPath nodeId : targets) {
            augmentedNode = nodeId.getResolvedNode().getParent();
            methodNode = nodeId.getResolvedNode();
            if (((JavaFileInfoContainer) methodNode).getJavaFileInfo()
                    .getJavaName() != null) {
                curNodeName =
                        ((JavaFileInfoContainer) methodNode).getJavaFileInfo()
                                .getJavaName();
            } else {
                curNodeName = getCapitalCase(
                        getCamelCase(methodNode.getName(),
                                     pluginConfig.getConflictResolver()));
            }
            returnType =
                    getAugmentedClassNameForDataMethods(augmentedNode, parent);
            parentName = getCurNodeName(augmentedNode,
                                        pluginConfig);
            method = generateForGetMethodWithAttribute(returnType) +
                    getGetMethodWithArgument(returnType, AUGMENTED +
                            parentName + getCapitalCase(curNodeName)) + NEW_LINE;
            methods.append(method);

            method = getJavaDoc(MANAGER_SETTER_METHOD,
                                AUGMENTED + getCapitalCase(parentName) +
                                        getCapitalCase(curNodeName), false,
                                null) +
                    getSetterForInterface(getSmallCase(AUGMENTED) + parentName +
                                                  getCapitalCase(curNodeName),
                                          returnType, parentName, false,
                                          GENERATE_SERVICE_AND_MANAGER, null) +
                    NEW_LINE;
            methods.append(method);
        }
        return methods.toString();
    }

    /**
     * Returns validator method for range in union class.
     *
     * @param type type
     * @return validator method for range in union class
     */
    static String getRangeValidatorMethodForUnion(String type) {
        String newType;
        if (type.contentEquals(BIG_INTEGER)) {
            newType = LONG;
        } else {
            newType = INT;
        }
        StringBuilder builder = new StringBuilder(generateForValidatorMethod());
        String var = getSmallCase(BIG_INTEGER);
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put(MIN_RANGE, type);
        map.put(MAX_RANGE, type);
        map.put(VALUE, newType);
        builder.append(multiAttrMethodSignature(VALIDATE_RANGE, EMPTY_STRING,
                                                PRIVATE, BOOLEAN_DATA_TYPE, map,
                                                CLASS_TYPE));
        if (type.contentEquals(BIG_INTEGER)) {
            //Create new instance of big integer.
            builder.append(getNewInstance(BIG_INTEGER, var, EIGHT_SPACE_INDENTATION,
                                          QUOTES + SPACE + QUOTES + SPACE +
                                                  ADD + SPACE + VALUE))
                    //Add return string.
                    .append(getReturnString(var, EIGHT_SPACE_INDENTATION))
                    //Add compareTo string
                    .append(getCompareToString())
                    //Add && condition.
                    .append(ifAndAndCondition(
                            //Add == condition
                            ifEqualEqualCondition(
                                    brackets(OPEN_CLOSE_BRACKET_WITH_VALUE,
                                             MIN_RANGE, null), ONE),
                            var))
                    //Add compareTo string.
                    .append(getCompareToString())
                    //Add == condition.
                    .append(ifEqualEqualCondition(
                            brackets(OPEN_CLOSE_BRACKET_WITH_VALUE,
                                     MAX_RANGE, null), ONE))
                    .append(signatureClose());
        } else {
            builder.append(getReturnString(VALUE, EIGHT_SPACE_INDENTATION))
                    .append(getGreaterThanCondition())
                    .append(ifAndAndCondition(MIN_RANGE, VALUE))
                    .append(getLesserThanCondition())
                    .append(MAX_RANGE)
                    .append(signatureClose());
        }
        builder.append(methodClose(FOUR_SPACE));
        return builder.toString();
    }

    //Get method with arguments.
    private static String getGetMethodWithArgument(String returnType,
                                                   String yangName) {
        return methodSignature(getCapitalCase(yangName), GET_METHOD_PREFIX,
                               null, getSmallCase(returnType),
                               returnType, returnType + OP_PARAM,
                               INTERFACE_TYPE);
    }

    /**
     * Returns add to list method interface.
     *
     * @param attr      java attribute
     * @param className name of the class
     * @return add to list method interface
     */
    public static String getAddToListMethodInterface(JavaAttributeInfo attr,
                                                     String className) {

        return methodSignature(ADD_STRING + TO_CAPS + getCapitalCase(
                attr.getAttributeName()), EMPTY_STRING, EMPTY_STRING,
                               ADD_STRING + TO_CAPS,
                               className + BUILDER, getReturnType(attr),
                               INTERFACE_TYPE);
    }

    /**
     * Returns add to list method impl.
     *
     * @param attr   java attribute
     * @param name   class name
     * @param isRoot is root
     * @return add to list method impl
     */
    public static String getAddToListMethodImpl(JavaAttributeInfo attr,
                                                String name,
                                                boolean isRoot) {
        String attrName = attr.getAttributeName();
        String retString = "";
        if (!isRoot) {
            retString = getOverRideString();
        }
        StringBuilder builder = new StringBuilder(retString);
        builder.append(methodSignature(ADD_STRING + TO_CAPS +
                                               getCapitalCase(attrName),
                                       EMPTY_STRING, PUBLIC, ADD_STRING + TO_CAPS,
                                       name + BUILDER, getReturnType(attr),
                                       CLASS_TYPE))
                .append(getIfConditionForAddToListMethod(attrName));
        retString = EIGHT_SPACE_INDENTATION + attrName + PERIOD + ADD_STRING +
                OPEN_PARENTHESIS + ADD_STRING + TO_CAPS + CLOSE_PARENTHESIS;
        builder.append(retString)
                .append(signatureClose())
                .append(getReturnString(THIS, EIGHT_SPACE_INDENTATION))
                .append(signatureClose())
                .append(methodClose(FOUR_SPACE));
        return builder.toString();
    }

    // Returns if condition for add to list method.
    static String getIfConditionForAddToListMethod(String name) {
        return getIfConditionBegin(EIGHT_SPACE_INDENTATION, name + SPACE + EQUAL +
                EQUAL + SPACE + NULL) + TWELVE_SPACE_INDENTATION +
                name + SPACE + EQUAL + SPACE +
                NEW + SPACE + ARRAY_LIST + signatureClose() + methodClose(
                EIGHT_SPACE);
    }

    /**
     * Returns builder method for class.
     *
     * @param name name of class
     * @return builder method for class
     */
    static String builderMethod(String name) {
        return generateForBuilderMethod(name) +
                methodSignature(BUILDER_LOWER_CASE,
                                EMPTY_STRING, PUBLIC + SPACE +
                                        STATIC, null, name + BUILDER, null, CLASS_TYPE) +
                getReturnString(NEW + SPACE + name + BUILDER,
                                EIGHT_SPACE_INDENTATION) +
                brackets(OPEN_CLOSE_BRACKET, null, null) + signatureClose() +
                methodClose(FOUR_SPACE);
    }

    /**
     * Returns is filter content match interface.
     *
     * @param name name of node
     * @return is filter content match interface
     */
    static String processSubtreeFilteringInterface(String name) {
        String method = "   /**\n" +
                "     * Checks if the passed " + name +
                " maps the content match query condition.\n" +
                "     *\n" +
                "     * @param " + getSmallCase(name) + SPACE +
                getSmallCase(name) + SPACE + "being passed to check" +
                " for" +
                " content match\n" +
                "     * @param isSelectAllSchemaChild is select all schema child\n" +
                "     * @return match result\n" +
                "     */\n";
        LinkedHashMap<String, String> map = new LinkedHashMap<>();
        map.put(name, getSmallCase(name));
        map.put(BOOLEAN_DATA_TYPE, SELECT_ALL_CHILD);

        return method + multiAttrMethodSignature(PROCESS_SUBTREE_FILTERING,
                                                 EMPTY_STRING, EMPTY_STRING,
                                                 name, map, INTERFACE_TYPE);
    }

    /**
     * Returns is value set interface.
     *
     * @return is value set interface
     */
    static String isLeafValueSetInterface() {
        String method = "\n    /**\n" +
                "     * Checks if the leaf value is set.\n" +
                "     *\n" +
                "     * @param leaf leaf whose value status needs to checked\n" +
                "     * @return result of leaf value set in object\n" +
                "     */\n";
        return method + methodSignature(VALUE_LEAF_SET, EMPTY_STRING, null,
                                        LEAF, BOOLEAN_DATA_TYPE,
                                        LEAF_IDENTIFIER, INTERFACE_TYPE);
    }

    /**
     * Returns is select leaf set interface.
     *
     * @return is select leaf set interface
     */
    static String isSelectLeafSetInterface() {
        String method = "\n    /**\n" +
                "     * Checks if the leaf is set to be a selected leaf.\n" +
                "     *\n" +
                "     * @param leaf if leaf needs to be selected\n" +
                "     * @return result of leaf value set in object\n" +
                "     */\n";
        return method + methodSignature(IS_SELECT_LEAF, EMPTY_STRING, null,
                                        LEAF, BOOLEAN_DATA_TYPE, LEAF_IDENTIFIER,
                                        INTERFACE_TYPE);
    }

    /**
     * Returns set select leaf set interface.
     *
     * @param name node name
     * @return set select leaf set interface
     */
    static String setSelectLeafSetInterface(String name) {
        String method = "    /**\n" +
                "     * Set a leaf to be selected.\n" +
                "     *\n" +
                "     * @param leaf leaf needs to be selected\n" +
                "     * @return builder object for select leaf\n" +
                "     */\n";
        return method + methodSignature(SET_SELECT_LEAF, EMPTY_STRING,
                                        null, LEAF, name +
                                                BUILDER, LEAF_IDENTIFIER,
                                        INTERFACE_TYPE) + NEW_LINE;
    }

    /**
     * Returns leaf identifier interface enum signature.
     *
     * @param name name of node
     * @return leaf identifier interface enum signature
     */
    static String getInterfaceLeafIdEnumSignature(String name) {
        String start = "\n    /**\n" +
                "     * Identify the leaf of " + name + PERIOD + NEW_LINE +
                "     */\n";
        return start + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + ENUM + SPACE +
                LEAF_IDENTIFIER + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
    }

    /**
     * Returns setter for select leaf.
     *
     * @param name       name of node
     * @param isRootNode if root node
     * @return setter for select leaf
     */
    static String getSetterForSelectLeaf(String name, boolean isRootNode) {
        String append = OVERRIDE;
        if (isRootNode) {
            append = EMPTY_STRING;
        }
        return "\n" +
                "    " + append + "\n" +
                "    public " + name + BUILDER +
                " selectLeaf(LeafIdentifier leaf) {\n" +
                "        getSelectLeafFlags().set(leaf.getLeafIndex());\n" +
                "        return this;\n" +
                "    }\n";
    }

    /**
     * Generates fromString code for bits.
     *
     * @param attr attribute information
     * @param yangBits parsed yang bits
     * @return generated fromString code for bits.
     */
    private static String getFromStringForBits(JavaAttributeInfo attr, YangBits yangBits) {
        String targetDataType = getReturnType(attr);
        String key;
        YangBit bit;
        // Split the input string and check each bit name falls in configured yang file
        String lines = targetDataType + SPACE + TMP_VAL + SPACE + EQUAL + SPACE + NEW + SPACE + targetDataType +
                OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLON + NEW_LINE +
                TWELVE_SPACE_INDENTATION + STRING_DATA_TYPE + SQUARE_BRACKETS + SPACE + BIT_NAMES_VAR + SPACE +
                EQUAL + SPACE + FROM_STRING_PARAM_NAME + PERIOD + TRIM_STRING + EMPTY_PARAMETER_FUNCTION_CALL +
                PERIOD + SPLIT_STRING + OPEN_PARENTHESIS + PATTERN + PERIOD + QUOTE_STRING +
                OPEN_PARENTHESIS +  QUOTES + SPACE + QUOTES + CLOSE_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLON +
                NEW_LINE +
                TWELVE_SPACE_INDENTATION + FOR + SPACE + OPEN_PARENTHESIS + STRING_DATA_TYPE + SPACE + BIT_NAME_VAR +
                SPACE + COLON + SPACE + BIT_NAMES_VAR + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
        boolean firstIf = true;
        String ifCondition = IF;
        for (Map.Entry<String, YangBit> entry : yangBits.getBitNameMap().entrySet()) {
            key = entry.getKey();
            bit = entry.getValue();
            if (bit == null) {
                return null;
            }
            if (firstIf) {
                lines += SIXTEEN_SPACE_INDENTATION;
            }
            // Add condition checking for bit name
            lines += ifCondition + SPACE + OPEN_PARENTHESIS + BIT_NAME_VAR + PERIOD +
                    EQUALS_STRING + OPEN_PARENTHESIS + QUOTES + key + QUOTES + CLOSE_PARENTHESIS + CLOSE_PARENTHESIS +
                    SPACE + OPEN_CURLY_BRACKET + NEW_LINE +
                    TWENTY_SPACE_INDENTATION + TMP_VAL + PERIOD + SET_METHOD_PREFIX + OPEN_PARENTHESIS +
                    bit.getPosition() + CLOSE_PARENTHESIS + SEMI_COLON + NEW_LINE + SIXTEEN_SPACE_INDENTATION +
                    CLOSE_CURLY_BRACKET;
            if (firstIf) {
                ifCondition = SPACE + ELSE_IF;
                firstIf = false;
            }
        }

        if (!firstIf) {
            // This means at least one if condition is added in code generation
            // Now add else condition for validation
            lines += SPACE + ELSE + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + TWENTY_SPACE_INDENTATION + RETURN +
                    SPACE + NULL + SEMI_COLON + NEW_LINE + SIXTEEN_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
        }

        lines += NEW_LINE + TWELVE_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE;
        return lines;
    }
}