    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 final int value;
    029
    030    /**
    031     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    032     */
    033    ICONST() {
    034        this(0);
    035    }
    036
    037    public ICONST(final int i) {
    038        super(org.apache.bcel.Const.ICONST_0, (short) 1);
    039        if (i < -1 || i > 5) {
    040            throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
    041        }
    042        super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
    043        value = i;
    044    }
    045
    046    /**
    047     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    048     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    049     *
    050     * @param v Visitor object
    051     */
    052    @Override
    053    public void accept(final Visitor v) {
    054        v.visitPushInstruction(this);
    055        v.visitStackProducer(this);
    056        v.visitTypedInstruction(this);
    057        v.visitConstantPushInstruction(this);
    058        v.visitICONST(this);
    059    }
    060
    061    /**
    062     * @return Type.INT
    063     */
    064    @Override
    065    public Type getType(final ConstantPoolGen cp) {
    066        return Type.INT;
    067    }
    068
    069    @Override
    070    public Number getValue() {
    071        return Integer.valueOf(value);
    072    }
    073}