    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.classfile;
    019
    020import java.io.DataOutputStream;
    021import java.io.IOException;
    022
    023import org.apache.bcel.Const;
    024
    025/**
    026 * @since 6.0
    027 */
    028public class SimpleElementValue extends ElementValue
    029{
    030    private int index;
    031
    032    public SimpleElementValue(final int type, final int index, final ConstantPool cpool)
    033    {
    034        super(type, cpool);
    035        this.index = index;
    036    }
    037
    038    /**
    039     * @return Value entry index in the cpool
    040     */
    041    public int getIndex()
    042    {
    043        return index;
    044    }
    045
    046    public void setIndex(final int index)
    047    {
    048        this.index = index;
    049    }
    050
    051    public String getValueString()
    052    {
    053        if (super.getType() != STRING) {
    054            throw new IllegalStateException(
    055                    "Dont call getValueString() on a non STRING ElementValue");
    056        }
    057        final ConstantUtf8 c = (ConstantUtf8) super.getConstantPool().getConstant(getIndex(),
    058                Const.CONSTANT_Utf8);
    059        return c.getBytes();
    060    }
    061
    062    public int getValueInt()
    063    {
    064        if (super.getType() != PRIMITIVE_INT) {
    065            throw new IllegalStateException(
    066                    "Dont call getValueString() on a non STRING ElementValue");
    067        }
    068        final ConstantInteger c = (ConstantInteger) super.getConstantPool().getConstant(getIndex(),
    069                Const.CONSTANT_Integer);
    070        return c.getBytes();
    071    }
    072
    073    public byte getValueByte()
    074    {
    075        if (super.getType() != PRIMITIVE_BYTE) {
    076            throw new IllegalStateException(
    077                    "Dont call getValueByte() on a non BYTE ElementValue");
    078        }
    079        final ConstantInteger c = (ConstantInteger) super.getConstantPool().getConstant(getIndex(),
    080                Const.CONSTANT_Integer);
    081        return (byte) c.getBytes();
    082    }
    083
    084    public char getValueChar()
    085    {
    086        if (super.getType() != PRIMITIVE_CHAR) {
    087            throw new IllegalStateException(
    088                    "Dont call getValueChar() on a non CHAR ElementValue");
    089        }
    090        final ConstantInteger c = (ConstantInteger) super.getConstantPool().getConstant(getIndex(),
    091                Const.CONSTANT_Integer);
    092        return (char) c.getBytes();
    093    }
    094
    095    public long getValueLong()
    096    {
    097        if (super.getType() != PRIMITIVE_LONG) {
    098            throw new IllegalStateException(
    099                    "Dont call getValueLong() on a non LONG ElementValue");
    100        }
    101        final ConstantLong j = (ConstantLong) super.getConstantPool().getConstant(getIndex());
    102        return j.getBytes();
    103    }
    104
    105    public float getValueFloat()
    106    {
    107        if (super.getType() != PRIMITIVE_FLOAT) {
    108            throw new IllegalStateException(
    109                    "Dont call getValueFloat() on a non FLOAT ElementValue");
    110        }
    111        final ConstantFloat f = (ConstantFloat) super.getConstantPool().getConstant(getIndex());
    112        return f.getBytes();
    113    }
    114
    115    public double getValueDouble()
    116    {
    117        if (super.getType() != PRIMITIVE_DOUBLE) {
    118            throw new IllegalStateException(
    119                    "Dont call getValueDouble() on a non DOUBLE ElementValue");
    120        }
    121        final ConstantDouble d = (ConstantDouble) super.getConstantPool().getConstant(getIndex());
    122        return d.getBytes();
    123    }
    124
    125    public boolean getValueBoolean()
    126    {
    127        if (super.getType() != PRIMITIVE_BOOLEAN) {
    128            throw new IllegalStateException(
    129                    "Dont call getValueBoolean() on a non BOOLEAN ElementValue");
    130        }
    131        final ConstantInteger bo = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    132        return bo.getBytes() != 0;
    133    }
    134
    135    public short getValueShort()
    136    {
    137        if (super.getType() != PRIMITIVE_SHORT) {
    138            throw new IllegalStateException(
    139                    "Dont call getValueShort() on a non SHORT ElementValue");
    140        }
    141        final ConstantInteger s = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    142        return (short) s.getBytes();
    143    }
    144
    145    @Override
    146    public String toString()
    147    {
    148        return stringifyValue();
    149    }
    150
    151    // Whatever kind of value it is, return it as a string
    152    @Override
    153    public String stringifyValue()
    154    {
    155        final ConstantPool cpool = super.getConstantPool();
    156        final int _type = super.getType();
    157        switch (_type)
    158        {
    159        case PRIMITIVE_INT:
    160            final ConstantInteger c = (ConstantInteger) cpool.getConstant(getIndex(),
    161                    Const.CONSTANT_Integer);
    162            return Integer.toString(c.getBytes());
    163        case PRIMITIVE_LONG:
    164            final ConstantLong j = (ConstantLong) cpool.getConstant(getIndex(),
    165                    Const.CONSTANT_Long);
    166            return Long.toString(j.getBytes());
    167        case PRIMITIVE_DOUBLE:
    168            final ConstantDouble d = (ConstantDouble) cpool.getConstant(getIndex(),
    169                    Const.CONSTANT_Double);
    170            return Double.toString(d.getBytes());
    171        case PRIMITIVE_FLOAT:
    172            final ConstantFloat f = (ConstantFloat) cpool.getConstant(getIndex(),
    173                    Const.CONSTANT_Float);
    174            return Float.toString(f.getBytes());
    175        case PRIMITIVE_SHORT:
    176            final ConstantInteger s = (ConstantInteger) cpool.getConstant(getIndex(),
    177                    Const.CONSTANT_Integer);
    178            return Integer.toString(s.getBytes());
    179        case PRIMITIVE_BYTE:
    180            final ConstantInteger b = (ConstantInteger) cpool.getConstant(getIndex(),
    181                    Const.CONSTANT_Integer);
    182            return Integer.toString(b.getBytes());
    183        case PRIMITIVE_CHAR:
    184            final ConstantInteger ch = (ConstantInteger) cpool.getConstant(
    185                    getIndex(), Const.CONSTANT_Integer);
    186            return String.valueOf((char)ch.getBytes());
    187        case PRIMITIVE_BOOLEAN:
    188            final ConstantInteger bo = (ConstantInteger) cpool.getConstant(
    189                    getIndex(), Const.CONSTANT_Integer);
    190            if (bo.getBytes() == 0) {
    191                return "false";
    192            }
    193            return "true";
    194        case STRING:
    195            final ConstantUtf8 cu8 = (ConstantUtf8) cpool.getConstant(getIndex(),
    196                    Const.CONSTANT_Utf8);
    197            return cu8.getBytes();
    198        default:
    199            throw new IllegalStateException("SimpleElementValue class does not know how to stringify type " + _type);
    200        }
    201    }
    202
    203    @Override
    204    public void dump(final DataOutputStream dos) throws IOException
    205    {
    206        final int _type = super.getType();
    207        dos.writeByte(_type); // u1 kind of value
    208        switch (_type)
    209        {
    210        case PRIMITIVE_INT:
    211        case PRIMITIVE_BYTE:
    212        case PRIMITIVE_CHAR:
    213        case PRIMITIVE_FLOAT:
    214        case PRIMITIVE_LONG:
    215        case PRIMITIVE_BOOLEAN:
    216        case PRIMITIVE_SHORT:
    217        case PRIMITIVE_DOUBLE:
    218        case STRING:
    219            dos.writeShort(getIndex());
    220            break;
    221        default:
    222            throw new IllegalStateException("SimpleElementValue doesnt know how to write out type " + _type);
    223        }
    224    }
    225}