    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}