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 * LCONST - Push 0 or 1, other values cause an exception
022 *
023 * <PRE>Stack: ... -&gt; ..., </PRE>
024 *
025 */
026public class LCONST extends Instruction implements ConstantPushInstruction {
027
028    private long value;
029
030
031    /**
032     * Empty constructor needed for Instruction.readInstruction.
033     * Not to be used otherwise.
034     */
035    LCONST() {
036    }
037
038
039    public LCONST(final long l) {
040        super(org.apache.bcel.Const.LCONST_0, (short) 1);
041        if (l == 0) {
042            super.setOpcode(org.apache.bcel.Const.LCONST_0);
043        } else if (l == 1) {
044            super.setOpcode(org.apache.bcel.Const.LCONST_1);
045        } else {
046            throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
047        }
048        value = l;
049    }
050
051
052    @Override
053    public Number getValue() {
054        return Long.valueOf(value);
055    }
056
057
058    /** @return Type.LONG
059     */
060    @Override
061    public Type getType( final ConstantPoolGen cp ) {
062        return Type.LONG;
063    }
064
065
066    /**
067     * Call corresponding visitor method(s). The order is:
068     * Call visitor methods of implemented interfaces first, then
069     * call methods according to the class hierarchy in descending order,
070     * i.e., the most specific visitXXX() call comes last.
071     *
072     * @param v Visitor object
073     */
074    @Override
075    public void accept( final Visitor v ) {
076        v.visitPushInstruction(this);
077        v.visitStackProducer(this);
078        v.visitTypedInstruction(this);
079        v.visitConstantPushInstruction(this);
080        v.visitLCONST(this);
081    }
082}