    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}