    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    private int index;
    030
    031    public SimpleElementValue(final int type, final int index, final ConstantPool cpool) {
    032        super(type, cpool);
    033        this.index = index;
    034    }
    035
    036    @Override
    037    public void dump(final DataOutputStream dos) throws IOException {
    038        final int type = super.getType();
    039        dos.writeByte(type); // u1 kind of value
    040        switch (type) {
    041        case PRIMITIVE_INT:
    042        case PRIMITIVE_BYTE:
    043        case PRIMITIVE_CHAR:
    044        case PRIMITIVE_FLOAT:
    045        case PRIMITIVE_LONG:
    046        case PRIMITIVE_BOOLEAN:
    047        case PRIMITIVE_SHORT:
    048        case PRIMITIVE_DOUBLE:
    049        case STRING:
    050            dos.writeShort(getIndex());
    051            break;
    052        default:
    053            throw new IllegalStateException("SimpleElementValue doesnt know how to write out type " + type);
    054        }
    055    }
    056
    057    /**
    058     * @return Value entry index in the cpool
    059     */
    060    public int getIndex() {
    061        return index;
    062    }
    063
    064    public boolean getValueBoolean() {
    065        if (super.getType() != PRIMITIVE_BOOLEAN) {
    066            throw new IllegalStateException("Dont call getValueBoolean() on a non BOOLEAN ElementValue");
    067        }
    068        final ConstantInteger bo = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    069        return bo.getBytes() != 0;
    070    }
    071
    072    public byte getValueByte() {
    073        if (super.getType() != PRIMITIVE_BYTE) {
    074            throw new IllegalStateException("Dont call getValueByte() on a non BYTE ElementValue");
    075        }
    076        return (byte) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    077    }
    078
    079    public char getValueChar() {
    080        if (super.getType() != PRIMITIVE_CHAR) {
    081            throw new IllegalStateException("Dont call getValueChar() on a non CHAR ElementValue");
    082        }
    083        return (char) super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    084    }
    085
    086    public double getValueDouble() {
    087        if (super.getType() != PRIMITIVE_DOUBLE) {
    088            throw new IllegalStateException("Dont call getValueDouble() on a non DOUBLE ElementValue");
    089        }
    090        final ConstantDouble d = (ConstantDouble) super.getConstantPool().getConstant(getIndex());
    091        return d.getBytes();
    092    }
    093
    094    public float getValueFloat() {
    095        if (super.getType() != PRIMITIVE_FLOAT) {
    096            throw new IllegalStateException("Dont call getValueFloat() on a non FLOAT ElementValue");
    097        }
    098        final ConstantFloat f = (ConstantFloat) super.getConstantPool().getConstant(getIndex());
    099        return f.getBytes();
    100    }
    101
    102    public int getValueInt() {
    103        if (super.getType() != PRIMITIVE_INT) {
    104            throw new IllegalStateException("Dont call getValueString() on a non STRING ElementValue");
    105        }
    106        return super.getConstantPool().getConstantInteger(getIndex()).getBytes();
    107    }
    108
    109    public long getValueLong() {
    110        if (super.getType() != PRIMITIVE_LONG) {
    111            throw new IllegalStateException("Dont call getValueLong() on a non LONG ElementValue");
    112        }
    113        final ConstantLong j = (ConstantLong) super.getConstantPool().getConstant(getIndex());
    114        return j.getBytes();
    115    }
    116
    117    public short getValueShort() {
    118        if (super.getType() != PRIMITIVE_SHORT) {
    119            throw new IllegalStateException("Dont call getValueShort() on a non SHORT ElementValue");
    120        }
    121        final ConstantInteger s = (ConstantInteger) super.getConstantPool().getConstant(getIndex());
    122        return (short) s.getBytes();
    123    }
    124
    125    public String getValueString() {
    126        if (super.getType() != STRING) {
    127            throw new IllegalStateException("Dont call getValueString() on a non STRING ElementValue");
    128        }
    129        return super.getConstantPool().getConstantUtf8(getIndex()).getBytes();
    130    }
    131
    132    public void setIndex(final int index) {
    133        this.index = index;
    134    }
    135
    136    // Whatever kind of value it is, return it as a string
    137    @Override
    138    public String stringifyValue() {
    139        final ConstantPool cpool = super.getConstantPool();
    140        final int type = super.getType();
    141        switch (type) {
    142        case PRIMITIVE_INT:
    143            return Integer.toString(cpool.getConstantInteger(getIndex()).getBytes());
    144        case PRIMITIVE_LONG:
    145            final ConstantLong j = cpool.getConstant(getIndex(), Const.CONSTANT_Long, ConstantLong.class);
    146            return Long.toString(j.getBytes());
    147        case PRIMITIVE_DOUBLE:
    148            final ConstantDouble d = cpool.getConstant(getIndex(), Const.CONSTANT_Double, ConstantDouble.class);
    149            return Double.toString(d.getBytes());
    150        case PRIMITIVE_FLOAT:
    151            final ConstantFloat f = cpool.getConstant(getIndex(), Const.CONSTANT_Float, ConstantFloat.class);
    152            return Float.toString(f.getBytes());
    153        case PRIMITIVE_SHORT:
    154            final ConstantInteger s = cpool.getConstantInteger(getIndex());
    155            return Integer.toString(s.getBytes());
    156        case PRIMITIVE_BYTE:
    157            final ConstantInteger b = cpool.getConstantInteger(getIndex());
    158            return Integer.toString(b.getBytes());
    159        case PRIMITIVE_CHAR:
    160            final ConstantInteger ch = cpool.getConstantInteger(getIndex());
    161            return String.valueOf((char) ch.getBytes());
    162        case PRIMITIVE_BOOLEAN:
    163            final ConstantInteger bo = cpool.getConstantInteger(getIndex());
    164            if (bo.getBytes() == 0) {
    165                return "false";
    166            }
    167            return "true";
    168        case STRING:
    169            return cpool.getConstantUtf8(getIndex()).getBytes();
    170        default:
    171            throw new IllegalStateException("SimpleElementValue class does not know how to stringify type " + type);
    172        }
    173    }
    174
    175    @Override
    176    public String toString() {
    177        return stringifyValue();
    178    }
    179}