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 * ICONST - Push value between -1, ..., 5, other values cause an exception
022 *
023 * <PRE>
024 * Stack: ... -&gt; ...,
025 * </PRE>
026 *
027 */
028public class ICONST extends Instruction implements ConstantPushInstruction {
029
030    private int value;
031
032    /**
033     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
034     */
035    ICONST() {
036    }
037
038    public ICONST(final int i) {
039        super(org.apache.bcel.Const.ICONST_0, (short) 1);
040        if (i < -1 || i > 5) {
041            throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
042        }
043        super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
044        value = i;
045    }
046
047    /**
048     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
049     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
050     *
051     * @param v Visitor object
052     */
053    @Override
054    public void accept(final Visitor v) {
055        v.visitPushInstruction(this);
056        v.visitStackProducer(this);
057        v.visitTypedInstruction(this);
058        v.visitConstantPushInstruction(this);
059        v.visitICONST(this);
060    }
061
062    /**
063     * @return Type.INT
064     */
065    @Override
066    public Type getType(final ConstantPoolGen cp) {
067        return Type.INT;
068    }
069
070    @Override
071    public Number getValue() {
072        return Integer.valueOf(value);
073    }
074}