    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}