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 * @version $Id: LCONST.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public class LCONST extends Instruction implements ConstantPushInstruction {
028
029    private long value;
030
031
032    /**
033     * Empty constructor needed for the Class.newInstance() statement in
034     * Instruction.readInstruction(). Not to be used otherwise.
035     */
036    LCONST() {
037    }
038
039
040    public LCONST(final long l) {
041        super(org.apache.bcel.Const.LCONST_0, (short) 1);
042        if (l == 0) {
043            super.setOpcode(org.apache.bcel.Const.LCONST_0);
044        } else if (l == 1) {
045            super.setOpcode(org.apache.bcel.Const.LCONST_1);
046        } else {
047            throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
048        }
049        value = l;
050    }
051
052
053    @Override
054    public Number getValue() {
055        return Long.valueOf(value);
056    }
057
058
059    /** @return Type.LONG
060     */
061    @Override
062    public Type getType( final ConstantPoolGen cp ) {
063        return Type.LONG;
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.visitPushInstruction(this);
078        v.visitStackProducer(this);
079        v.visitTypedInstruction(this);
080        v.visitConstantPushInstruction(this);
081        v.visitLCONST(this);
082    }
083}