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
020import java.io.DataOutputStream;
021import java.io.IOException;
022
023import org.apache.bcel.util.ByteSequence;
024
025/**
026 * SIPUSH - Push short
027 *
028 * <PRE>Stack: ... -&gt; ..., value</PRE>
029 *
030 * @version $Id: SIPUSH.java 1812166 2017-10-13 23:48:11Z ggregory $
031 */
032public class SIPUSH extends Instruction implements ConstantPushInstruction {
033
034    private short b;
035
036
037    /**
038     * Empty constructor needed for Instruction.readInstruction.
039     * Not to be used otherwise.
040     */
041    SIPUSH() {
042    }
043
044
045    public SIPUSH(final short b) {
046        super(org.apache.bcel.Const.SIPUSH, (short) 3);
047        this.b = b;
048    }
049
050
051    /**
052     * Dump instruction as short code to stream out.
053     */
054    @Override
055    public void dump( final DataOutputStream out ) throws IOException {
056        super.dump(out);
057        out.writeShort(b);
058    }
059
060
061    /**
062     * @return mnemonic for instruction
063     */
064    @Override
065    public String toString( final boolean verbose ) {
066        return super.toString(verbose) + " " + b;
067    }
068
069
070    /**
071     * Read needed data (e.g. index) from file.
072     */
073    @Override
074    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
075        super.setLength(3);
076        b = bytes.readShort();
077    }
078
079
080    @Override
081    public Number getValue() {
082        return Integer.valueOf(b);
083    }
084
085
086    /** @return Type.SHORT
087     */
088    @Override
089    public Type getType( final ConstantPoolGen cp ) {
090        return Type.SHORT;
091    }
092
093
094    /**
095     * Call corresponding visitor method(s). The order is:
096     * Call visitor methods of implemented interfaces first, then
097     * call methods according to the class hierarchy in descending order,
098     * i.e., the most specific visitXXX() call comes last.
099     *
100     * @param v Visitor object
101     */
102    @Override
103    public void accept( final Visitor v ) {
104        v.visitPushInstruction(this);
105        v.visitStackProducer(this);
106        v.visitTypedInstruction(this);
107        v.visitConstantPushInstruction(this);
108        v.visitSIPUSH(this);
109    }
110}