    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 $Id$
    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}