    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 *  Unless required by applicable law or agreed to in writing, software
    012 *  distributed under the License is distributed on an "AS IS" BASIS,
    013 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 *  See the License for the specific language governing permissions and
    015 *  limitations under the License.
    016 *
    017 */
    018package org.apache.bcel.generic;
    019
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022
    023import org.apache.bcel.classfile.ConstantUtf8;
    024import org.apache.bcel.classfile.ElementValue;
    025import org.apache.bcel.classfile.ElementValuePair;
    026
    027/**
    028 * @since 6.0
    029 */
    030public class ElementValuePairGen
    031{
    032    private int nameIdx;
    033
    034    private final ElementValueGen value;
    035
    036    private final ConstantPoolGen constantPoolGen;
    037
    038    public ElementValuePairGen(final ElementValuePair nvp, final ConstantPoolGen cpool,
    039            final boolean copyPoolEntries)
    040    {
    041        this.constantPoolGen = cpool;
    042        // J5ASSERT:
    043        // Could assert nvp.getNameString() points to the same thing as
    044        // constantPoolGen.getConstant(nvp.getNameIndex())
    045        // if
    046        // (!nvp.getNameString().equals(((ConstantUtf8)constantPoolGen.getConstant(nvp.getNameIndex())).getBytes()))
    047        // {
    048        // throw new IllegalArgumentException("envp buggered");
    049        // }
    050        if (copyPoolEntries)
    051        {
    052            nameIdx = cpool.addUtf8(nvp.getNameString());
    053        }
    054        else
    055        {
    056            nameIdx = nvp.getNameIndex();
    057        }
    058        value = ElementValueGen.copy(nvp.getValue(), cpool, copyPoolEntries);
    059    }
    060
    061    /**
    062     * Retrieve an immutable version of this ElementNameValuePairGen
    063     */
    064    public ElementValuePair getElementNameValuePair()
    065    {
    066        final ElementValue immutableValue = value.getElementValue();
    067        return new ElementValuePair(nameIdx, immutableValue, constantPoolGen
    068                .getConstantPool());
    069    }
    070
    071    protected ElementValuePairGen(final int idx, final ElementValueGen value,
    072            final ConstantPoolGen cpool)
    073    {
    074        this.nameIdx = idx;
    075        this.value = value;
    076        this.constantPoolGen = cpool;
    077    }
    078
    079    public ElementValuePairGen(final String name, final ElementValueGen value,
    080            final ConstantPoolGen cpool)
    081    {
    082        this.nameIdx = cpool.addUtf8(name);
    083        this.value = value;
    084        this.constantPoolGen = cpool;
    085    }
    086
    087    protected void dump(final DataOutputStream dos) throws IOException
    088    {
    089        dos.writeShort(nameIdx); // u2 name of the element
    090        value.dump(dos);
    091    }
    092
    093    public int getNameIndex()
    094    {
    095        return nameIdx;
    096    }
    097
    098    public final String getNameString()
    099    {
    100        // ConstantString cu8 = (ConstantString)constantPoolGen.getConstant(nameIdx);
    101        return ((ConstantUtf8) constantPoolGen.getConstant(nameIdx)).getBytes();
    102    }
    103
    104    public final ElementValueGen getValue()
    105    {
    106        return value;
    107    }
    108
    109    @Override
    110    public String toString()
    111    {
    112        return "ElementValuePair:[" + getNameString() + "="
    113                + value.stringifyValue() + "]";
    114    }
    115}