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