001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.bcel.generic;
020
021import java.io.DataOutputStream;
022import java.io.IOException;
023
024import org.apache.bcel.util.ByteSequence;
025
026/**
027 * SIPUSH - Push short
028 *
029 * <PRE>
030 * Stack: ... -&gt; ..., value
031 * </PRE>
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     * Reads needed data (for example 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}