001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.bcel.generic;
020
021/**
022 * LCONST - Push 0 or 1, other values cause an exception
023 *
024 * <PRE>
025 * Stack: ... -&gt; ...,
026 * </PRE>
027 */
028public class LCONST extends Instruction implements ConstantPushInstruction {
029
030    private final long value;
031
032    /**
033     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
034     */
035    LCONST() {
036        this(0);
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     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
053     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
054     *
055     * @param v Visitor object
056     */
057    @Override
058    public void accept(final Visitor v) {
059        v.visitPushInstruction(this);
060        v.visitStackProducer(this);
061        v.visitTypedInstruction(this);
062        v.visitConstantPushInstruction(this);
063        v.visitLCONST(this);
064    }
065
066    /**
067     * @return Type.LONG
068     */
069    @Override
070    public Type getType(final ConstantPoolGen cp) {
071        return Type.LONG;
072    }
073
074    @Override
075    public Number getValue() {
076        return Long.valueOf(value);
077    }
078}