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    /**
040     * Constructs an LCONST instruction.
041     *
042     * @param l long constant value.
043     */
044    public LCONST(final long l) {
045        super(org.apache.bcel.Const.LCONST_0, (short) 1);
046        if (l == 0) {
047            super.setOpcode(org.apache.bcel.Const.LCONST_0);
048        } else if (l == 1) {
049            super.setOpcode(org.apache.bcel.Const.LCONST_1);
050        } else {
051            throw new ClassGenException("LCONST can be used only for 0 and 1: " + l);
052        }
053        value = l;
054    }
055
056    /**
057     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
058     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
059     *
060     * @param v Visitor object.
061     */
062    @Override
063    public void accept(final Visitor v) {
064        v.visitPushInstruction(this);
065        v.visitStackProducer(this);
066        v.visitTypedInstruction(this);
067        v.visitConstantPushInstruction(this);
068        v.visitLCONST(this);
069    }
070
071    /**
072     * @return Type.LONG.
073     */
074    @Override
075    public Type getType(final ConstantPoolGen cp) {
076        return Type.LONG;
077    }
078
079    @Override
080    public Number getValue() {
081        return Long.valueOf(value);
082    }
083}