    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>Stack: ... -&gt; ..., item.word1, item.word2</PRE>
    024 *
    025 */
    026public class LDC2_W extends CPInstruction implements PushInstruction {
    027
    028    /**
    029     * Empty constructor needed for Instruction.readInstruction.
    030     * Not to be used otherwise.
    031     */
    032    LDC2_W() {
    033    }
    034
    035
    036    public LDC2_W(final int index) {
    037        super(org.apache.bcel.Const.LDC2_W, index);
    038    }
    039
    040
    041    @Override
    042    public Type getType( final ConstantPoolGen cpg ) {
    043        switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
    044            case org.apache.bcel.Const.CONSTANT_Long:
    045                return Type.LONG;
    046            case org.apache.bcel.Const.CONSTANT_Double:
    047                return Type.DOUBLE;
    048            default: // Never reached
    049                throw new RuntimeException("Unknown constant type " + super.getOpcode());
    050        }
    051    }
    052
    053
    054    public Number getValue( final ConstantPoolGen cpg ) {
    055        final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
    056        switch (c.getTag()) {
    057            case org.apache.bcel.Const.CONSTANT_Long:
    058                return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
    059            case org.apache.bcel.Const.CONSTANT_Double:
    060                return new Double(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
    061            default: // Never reached
    062                throw new RuntimeException("Unknown or invalid constant type at " + super.getIndex());
    063        }
    064    }
    065
    066
    067    /**
    068     * Call corresponding visitor method(s). The order is:
    069     * Call visitor methods of implemented interfaces first, then
    070     * call methods according to the class hierarchy in descending order,
    071     * i.e., the most specific visitXXX() call comes last.
    072     *
    073     * @param v Visitor object
    074     */
    075    @Override
    076    public void accept( final Visitor v ) {
    077        v.visitStackProducer(this);
    078        v.visitPushInstruction(this);
    079        v.visitTypedInstruction(this);
    080        v.visitCPInstruction(this);
    081        v.visitLDC2_W(this);
    082    }
    083}