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>Stack: ... -&gt; ..., </PRE>
024 *
025 * @version $Id: ICONST.java 1747278 2016-06-07 17:28:43Z britter $
026 */
027public class ICONST extends Instruction implements ConstantPushInstruction {
028
029    private int value;
030
031
032    /**
033     * Empty constructor needed for the Class.newInstance() statement in
034     * Instruction.readInstruction(). Not to be used otherwise.
035     */
036    ICONST() {
037    }
038
039
040    public ICONST(final int i) {
041        super(org.apache.bcel.Const.ICONST_0, (short) 1);
042        if ((i >= -1) && (i <= 5)) {
043            super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
044        } else {
045            throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
046        }
047        value = i;
048    }
049
050
051    @Override
052    public Number getValue() {
053        return Integer.valueOf(value);
054    }
055
056
057    /** @return Type.INT
058     */
059    @Override
060    public Type getType( final ConstantPoolGen cp ) {
061        return Type.INT;
062    }
063
064
065    /**
066     * Call corresponding visitor method(s). The order is:
067     * Call visitor methods of implemented interfaces first, then
068     * call methods according to the class hierarchy in descending order,
069     * i.e., the most specific visitXXX() call comes last.
070     *
071     * @param v Visitor object
072     */
073    @Override
074    public void accept( final Visitor v ) {
075        v.visitPushInstruction(this);
076        v.visitStackProducer(this);
077        v.visitTypedInstruction(this);
078        v.visitConstantPushInstruction(this);
079        v.visitICONST(this);
080    }
081}