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