    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.EnumElementValue;
    026
    027/**
    028 * @since 6.0
    029 */
    030public class EnumElementValueGen extends ElementValueGen
    031{
    032    // For enum types, these two indices point to the type and value
    033    private int typeIdx;
    034
    035    private int valueIdx;
    036
    037    /**
    038     * This ctor assumes the constant pool already contains the right type and
    039     * value - as indicated by typeIdx and valueIdx. This ctor is used for
    040     * deserialization
    041     */
    042    protected EnumElementValueGen(final int typeIdx, final int valueIdx,
    043            final ConstantPoolGen cpool)
    044    {
    045        super(ElementValueGen.ENUM_CONSTANT, cpool);
    046        if (super.getElementValueType() != ENUM_CONSTANT) {
    047            throw new RuntimeException(
    048                    "Only element values of type enum can be built with this ctor - type specified: " + super.getElementValueType());
    049        }
    050        this.typeIdx = typeIdx;
    051        this.valueIdx = valueIdx;
    052    }
    053
    054    /**
    055     * Return immutable variant of this EnumElementValue
    056     */
    057    @Override
    058    public ElementValue getElementValue()
    059    {
    060        System.err.println("Duplicating value: " + getEnumTypeString() + ":"
    061                + getEnumValueString());
    062        return new EnumElementValue(super.getElementValueType(), typeIdx, valueIdx,
    063                getConstantPool().getConstantPool());
    064    }
    065
    066    public EnumElementValueGen(final ObjectType t, final String value, final ConstantPoolGen cpool)
    067    {
    068        super(ElementValueGen.ENUM_CONSTANT, cpool);
    069        typeIdx = cpool.addUtf8(t.getSignature());// was addClass(t);
    070        valueIdx = cpool.addUtf8(value);// was addString(value);
    071    }
    072
    073    public EnumElementValueGen(final EnumElementValue value, final ConstantPoolGen cpool,
    074            final boolean copyPoolEntries)
    075    {
    076        super(ENUM_CONSTANT, cpool);
    077        if (copyPoolEntries)
    078        {
    079            typeIdx = cpool.addUtf8(value.getEnumTypeString());// was
    080                                                                // addClass(value.getEnumTypeString());
    081            valueIdx = cpool.addUtf8(value.getEnumValueString()); // was
    082                                                                    // addString(value.getEnumValueString());
    083        }
    084        else
    085        {
    086            typeIdx = value.getTypeIndex();
    087            valueIdx = value.getValueIndex();
    088        }
    089    }
    090
    091    @Override
    092    public void dump(final DataOutputStream dos) throws IOException
    093    {
    094        dos.writeByte(super.getElementValueType()); // u1 type of value (ENUM_CONSTANT == 'e')
    095        dos.writeShort(typeIdx); // u2
    096        dos.writeShort(valueIdx); // u2
    097    }
    098
    099    @Override
    100    public String stringifyValue()
    101    {
    102        final ConstantUtf8 cu8 = (ConstantUtf8) getConstantPool().getConstant(valueIdx);
    103        return cu8.getBytes();
    104        // ConstantString cu8 =
    105        // (ConstantString)getConstantPool().getConstant(valueIdx);
    106        // return
    107        // ((ConstantUtf8)getConstantPool().getConstant(cu8.getStringIndex())).getBytes();
    108    }
    109
    110    // BCELBUG: Should we need to call utility.signatureToString() on the output
    111    // here?
    112    public String getEnumTypeString()
    113    {
    114        // Constant cc = getConstantPool().getConstant(typeIdx);
    115        // ConstantClass cu8 =
    116        // (ConstantClass)getConstantPool().getConstant(typeIdx);
    117        // return
    118        // ((ConstantUtf8)getConstantPool().getConstant(cu8.getNameIndex())).getBytes();
    119        return ((ConstantUtf8) getConstantPool().getConstant(typeIdx))
    120                .getBytes();
    121        // return Utility.signatureToString(cu8.getBytes());
    122    }
    123
    124    public String getEnumValueString()
    125    {
    126        return ((ConstantUtf8) getConstantPool().getConstant(valueIdx)).getBytes();
    127        // ConstantString cu8 =
    128        // (ConstantString)getConstantPool().getConstant(valueIdx);
    129        // return
    130        // ((ConstantUtf8)getConstantPool().getConstant(cu8.getStringIndex())).getBytes();
    131    }
    132
    133    public int getValueIndex()
    134    {
    135        return valueIdx;
    136    }
    137
    138    public int getTypeIndex()
    139    {
    140        return typeIdx;
    141    }
    142}