    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    private final int nameIdx;
    032
    033    private final ElementValueGen value;
    034
    035    private final ConstantPoolGen constantPoolGen;
    036
    037    public ElementValuePairGen(final ElementValuePair nvp, final ConstantPoolGen cpool, final boolean copyPoolEntries) {
    038        this.constantPoolGen = cpool;
    039        // J5ASSERT:
    040        // Could assert nvp.getNameString() points to the same thing as
    041        // constantPoolGen.getConstant(nvp.getNameIndex())
    042        // if
    043        // (!nvp.getNameString().equals(((ConstantUtf8)constantPoolGen.getConstant(nvp.getNameIndex())).getBytes()))
    044        // {
    045        // throw new IllegalArgumentException("envp buggered");
    046        // }
    047        if (copyPoolEntries) {
    048            nameIdx = cpool.addUtf8(nvp.getNameString());
    049        } else {
    050            nameIdx = nvp.getNameIndex();
    051        }
    052        value = ElementValueGen.copy(nvp.getValue(), cpool, copyPoolEntries);
    053    }
    054
    055    protected ElementValuePairGen(final int idx, final ElementValueGen value, final ConstantPoolGen cpool) {
    056        this.nameIdx = idx;
    057        this.value = value;
    058        this.constantPoolGen = cpool;
    059    }
    060
    061    public ElementValuePairGen(final String name, final ElementValueGen value, final ConstantPoolGen cpool) {
    062        this.nameIdx = cpool.addUtf8(name);
    063        this.value = value;
    064        this.constantPoolGen = cpool;
    065    }
    066
    067    protected void dump(final DataOutputStream dos) throws IOException {
    068        dos.writeShort(nameIdx); // u2 name of the element
    069        value.dump(dos);
    070    }
    071
    072    /**
    073     * Retrieve an immutable version of this ElementNameValuePairGen
    074     */
    075    public ElementValuePair getElementNameValuePair() {
    076        final ElementValue immutableValue = value.getElementValue();
    077        return new ElementValuePair(nameIdx, immutableValue, constantPoolGen.getConstantPool());
    078    }
    079
    080    public int getNameIndex() {
    081        return nameIdx;
    082    }
    083
    084    public final String getNameString() {
    085        // ConstantString cu8 = (ConstantString)constantPoolGen.getConstant(nameIdx);
    086        return ((ConstantUtf8) constantPoolGen.getConstant(nameIdx)).getBytes();
    087    }
    088
    089    public final ElementValueGen getValue() {
    090        return value;
    091    }
    092
    093    @Override
    094    public String toString() {
    095        return "ElementValuePair:[" + getNameString() + "=" + value.stringifyValue() + "]";
    096    }
    097}