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
020/**
021 * LDC2_W - Push long or double from constant pool
022 *
023 * <PRE>
024 * Stack: ... -&gt; ..., item.word1, item.word2
025 * </PRE>
026 *
027 */
028public class LDC2_W extends CPInstruction implements PushInstruction {
029
030    /**
031     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
032     */
033    LDC2_W() {
034    }
035
036    public LDC2_W(final int index) {
037        super(org.apache.bcel.Const.LDC2_W, index);
038    }
039
040    /**
041     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
042     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
043     *
044     * @param v Visitor object
045     */
046    @Override
047    public void accept(final Visitor v) {
048        v.visitStackProducer(this);
049        v.visitPushInstruction(this);
050        v.visitTypedInstruction(this);
051        v.visitCPInstruction(this);
052        v.visitLDC2_W(this);
053    }
054
055    @Override
056    public Type getType(final ConstantPoolGen cpg) {
057        switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
058        case org.apache.bcel.Const.CONSTANT_Long:
059            return Type.LONG;
060        case org.apache.bcel.Const.CONSTANT_Double:
061            return Type.DOUBLE;
062        default: // Never reached
063            throw new IllegalArgumentException("Unknown constant type " + super.getOpcode());
064        }
065    }
066
067    public Number getValue(final ConstantPoolGen cpg) {
068        final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
069        switch (c.getTag()) {
070        case org.apache.bcel.Const.CONSTANT_Long:
071            return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
072        case org.apache.bcel.Const.CONSTANT_Double:
073            return Double.valueOf(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
074        default: // Never reached
075            throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex());
076        }
077    }
078}