    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 */
    017package org.apache.bcel.classfile;
    018
    019import java.io.DataOutputStream;
    020import java.io.IOException;
    021
    022import org.apache.bcel.Const;
    023
    024/**
    025 * @since 6.0
    026 */
    027public class SimpleElementValue extends ElementValue {
    028    private int index;
    029
    030    public SimpleElementValue(final int type, final int index, final ConstantPool cpool) {
    031        super(type, cpool);
    032        this.index = index;
    033    }
    034
    035    @Override
    036    public void dump(final DataOutputStream dos) throws IOException {
    037        final int type = super.getType();
    038        dos.writeByte(type); // u1 kind of value
    039        switch (type) {
    040        case PRIMITIVE_INT:
    041        case PRIMITIVE_BYTE:
    042        case PRIMITIVE_CHAR:
    043        case PRIMITIVE_FLOAT:
    044        case PRIMITIVE_LONG:
    045        case PRIMITIVE_BOOLEAN:
    046        case PRIMITIVE_SHORT:
    047        case PRIMITIVE_DOUBLE:
    048        case STRING:
    049            dos.writeShort(getIndex());
    050            break;
    051        default:
    052            throw new ClassFormatException("SimpleElementValue doesnt know how to write out type " + type);
    053        }
    054    }
    055
    056    /**
    057     * @return Value entry index in the cpool
    058     */
    059    public int getIndex() {
    060        return index;
    061    }
    062
    063    public boolean getValueBoolean() {
    064        if (super.getType() != PRIMITIVE_BOOLEAN) {
    065            throw new IllegalStateException("Dont call getValueBoolean() on a non BOOLEAN ElementValue");
    066        }
    067        final ConstantInteger bo = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    068        return bo.getBytes() != 0;
    069    }
    070
    071    public byte getValueByte() {
    072        if (super.getType() != PRIMITIVE_BYTE) {
    073            throw new IllegalStateException("Dont call getValueByte() on a non BYTE ElementValue");
    074        }
    075        return (byte) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    076    }
    077
    078    public char getValueChar() {
    079        if (super.getType() != PRIMITIVE_CHAR) {
    080            throw new IllegalStateException("Dont call getValueChar() on a non CHAR ElementValue");
    081        }
    082        return (char) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    083    }
    084
    085    public double getValueDouble() {
    086        if (super.getType() != PRIMITIVE_DOUBLE) {
    087            throw new IllegalStateException("Dont call getValueDouble() on a non DOUBLE ElementValue");
    088        }
    089        final ConstantDouble d = (ConstantDouble) super.getConstantPool().getConstant(getIndex());
    090        return d.getBytes();
    091    }
    092
    093    public float getValueFloat() {
    094        if (super.getType() != PRIMITIVE_FLOAT) {
    095            throw new IllegalStateException("Dont call getValueFloat() on a non FLOAT ElementValue");
    096        }
    097        final ConstantFloat f = (ConstantFloat) super.getConstantPool().getConstant(getIndex());
    098        return f.getBytes();
    099    }
    100
    101    public int getValueInt() {
    102        if (super.getType() != PRIMITIVE_INT) {
    103            throw new IllegalStateException("Dont call getValueInt() on a non INT ElementValue");
    104        }
    105        return super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    106    }
    107
    108    public long getValueLong() {
    109        if (super.getType() != PRIMITIVE_LONG) {
    110            throw new IllegalStateException("Dont call getValueLong() on a non LONG ElementValue");
    111        }
    112        final ConstantLong j = (ConstantLong) super.getConstantPool().getConstant(getIndex());
    113        return j.getBytes();
    114    }
    115
    116    public short getValueShort() {
    117        if (super.getType() != PRIMITIVE_SHORT) {
    118            throw new IllegalStateException("Dont call getValueShort() on a non SHORT ElementValue");
    119        }
    120        final ConstantInteger s = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    121        return (short) s.getBytes();
    122    }
    123
    124    public String getValueString() {
    125        if (super.getType() != STRING) {
    126            throw new IllegalStateException("Dont call getValueString() on a non STRING ElementValue");
    127        }
    128        return super.getConstantPool().getConstantUtf8(getIndex()).getBytes();
    129    }
    130
    131    public void setIndex(final int index) {
    132        this.index = index;
    133    }
    134
    135    // Whatever kind of value it is, return it as a string
    136    @Override
    137    public String stringifyValue() {
    138        final ConstantPool cpool = super.getConstantPool();
    139        final int type = super.getType();
    140        switch (type) {
    141        case PRIMITIVE_INT:
    142            return Integer.toString(cpool.getConstantInteger(getIndex()).getBytes());
    143        case PRIMITIVE_LONG:
    144            final ConstantLong j = cpool.getConstant(getIndex(), Const.CONSTANT_Long, ConstantLong.class);
    145            return Long.toString(j.getBytes());
    146        case PRIMITIVE_DOUBLE:
    147            final ConstantDouble d = cpool.getConstant(getIndex(), Const.CONSTANT_Double, ConstantDouble.class);
    148            return Double.toString(d.getBytes());
    149        case PRIMITIVE_FLOAT:
    150            final ConstantFloat f = cpool.getConstant(getIndex(), Const.CONSTANT_Float, ConstantFloat.class);
    151            return Float.toString(f.getBytes());
    152        case PRIMITIVE_SHORT:
    153            final ConstantInteger s = cpool.getConstantInteger(getIndex());
    154            return Integer.toString(s.getBytes());
    155        case PRIMITIVE_BYTE:
    156            final ConstantInteger b = cpool.getConstantInteger(getIndex());
    157            return Integer.toString(b.getBytes());
    158        case PRIMITIVE_CHAR:
    159            final ConstantInteger ch = cpool.getConstantInteger(getIndex());
    160            return String.valueOf((char) ch.getBytes());
    161        case PRIMITIVE_BOOLEAN:
    162            final ConstantInteger bo = cpool.getConstantInteger(getIndex());
    163            if (bo.getBytes() == 0) {
    164                return "false";
    165            }
    166            return "true";
    167        case STRING:
    168            return cpool.getConstantUtf8(getIndex()).getBytes();
    169        default:
    170            throw new IllegalStateException("SimpleElementValue class does not know how to stringify type " + type);
    171        }
    172    }
    173
    174    @Override
    175    public String toString() {
    176        return stringifyValue();
    177    }
    178}