    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.bcel.generic;
    020
    021/**
    022 * ICONST - Push value between -1, ..., 5, other values cause an exception
    023 *
    024 * <PRE>
    025 * Stack: ... -&gt; ...,
    026 * </PRE>
    027 */
    028public class ICONST extends Instruction implements ConstantPushInstruction {
    029
    030    private final int value;
    031
    032    /**
    033     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    034     */
    035    ICONST() {
    036        this(0);
    037    }
    038
    039    /**
    040     * Constructs an ICONST instruction.
    041     *
    042     * @param i the integer value.
    043     */
    044    public ICONST(final int i) {
    045        super(org.apache.bcel.Const.ICONST_0, (short) 1);
    046        if (i < -1 || i > 5) {
    047            throw new ClassGenException("ICONST can be used only for value between -1 and 5: " + i);
    048        }
    049        super.setOpcode((short) (org.apache.bcel.Const.ICONST_0 + i)); // Even works for i == -1
    050        value = i;
    051    }
    052
    053    /**
    054     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    055     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
    056     *
    057     * @param v Visitor object.
    058     */
    059    @Override
    060    public void accept(final Visitor v) {
    061        v.visitPushInstruction(this);
    062        v.visitStackProducer(this);
    063        v.visitTypedInstruction(this);
    064        v.visitConstantPushInstruction(this);
    065        v.visitICONST(this);
    066    }
    067
    068    /**
    069     * @return Type.INT.
    070     */
    071    @Override
    072    public Type getType(final ConstantPoolGen cp) {
    073        return Type.INT;
    074    }
    075
    076    @Override
    077    public Number getValue() {
    078        return Integer.valueOf(value);
    079    }
    080}