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 */
017package org.apache.bcel.generic;
018
019/**
020 * ICONST - Push value between -1, ..., 5, other values cause an exception
021 *
022 * <PRE>
023 * Stack: ... -&gt; ...,
024 * </PRE>
025 */
026public class ICONST extends Instruction implements ConstantPushInstruction {
027
028    private int value;
029
030    /**
031     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
032     */
033    ICONST() {
034    }
035
036    public ICONST(final int i) {
037        super(org.apache.bcel.Const.ICONST_0, (short) 1);
038        if (i < -1 || i > 5) {
039            throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
040        }
041        super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
042        value = i;
043    }
044
045    /**
046     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
047     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
048     *
049     * @param v Visitor object
050     */
051    @Override
052    public void accept(final Visitor v) {
053        v.visitPushInstruction(this);
054        v.visitStackProducer(this);
055        v.visitTypedInstruction(this);
056        v.visitConstantPushInstruction(this);
057        v.visitICONST(this);
058    }
059
060    /**
061     * @return Type.INT
062     */
063    @Override
064    public Type getType(final ConstantPoolGen cp) {
065        return Type.INT;
066    }
067
068    @Override
069    public Number getValue() {
070        return Integer.valueOf(value);
071    }
072}