    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.generic;
    018
    019/**
    020 * LDC2_W - Push long or double from constant pool
    021 *
    022 * <PRE>
    023 * Stack: ... -&gt; ..., item.word1, item.word2
    024 * </PRE>
    025 */
    026public class LDC2_W extends CPInstruction implements PushInstruction {
    027
    028    /**
    029     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    030     */
    031    LDC2_W() {
    032    }
    033
    034    public LDC2_W(final int index) {
    035        super(org.apache.bcel.Const.LDC2_W, index);
    036    }
    037
    038    /**
    039     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    040     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    041     *
    042     * @param v Visitor object
    043     */
    044    @Override
    045    public void accept(final Visitor v) {
    046        v.visitStackProducer(this);
    047        v.visitPushInstruction(this);
    048        v.visitTypedInstruction(this);
    049        v.visitCPInstruction(this);
    050        v.visitLDC2_W(this);
    051    }
    052
    053    @Override
    054    public Type getType(final ConstantPoolGen cpg) {
    055        switch (cpg.getConstantPool().getConstant(super.getIndex()).getTag()) {
    056        case org.apache.bcel.Const.CONSTANT_Long:
    057            return Type.LONG;
    058        case org.apache.bcel.Const.CONSTANT_Double:
    059            return Type.DOUBLE;
    060        default: // Never reached
    061            throw new IllegalArgumentException("Unknown constant type " + super.getOpcode());
    062        }
    063    }
    064
    065    public Number getValue(final ConstantPoolGen cpg) {
    066        final org.apache.bcel.classfile.Constant c = cpg.getConstantPool().getConstant(super.getIndex());
    067        switch (c.getTag()) {
    068        case org.apache.bcel.Const.CONSTANT_Long:
    069            return Long.valueOf(((org.apache.bcel.classfile.ConstantLong) c).getBytes());
    070        case org.apache.bcel.Const.CONSTANT_Double:
    071            return Double.valueOf(((org.apache.bcel.classfile.ConstantDouble) c).getBytes());
    072        default: // Never reached
    073            throw new IllegalArgumentException("Unknown or invalid constant type at " + super.getIndex());
    074        }
    075    }
    076}