    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 $Id$
    026 */
    027public class ICONST extends Instruction implements ConstantPushInstruction {
    028
    029    private int value;
    030
    031
    032    /**
    033     * Empty constructor needed for Instruction.readInstruction.
    034     * 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}