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