    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 */
    017package org.apache.bcel.generic;
    018
    019import java.io.DataOutputStream;
    020import java.io.IOException;
    021
    022import org.apache.bcel.util.ByteSequence;
    023
    024/**
    025 * SIPUSH - Push short
    026 *
    027 * <PRE>
    028 * Stack: ... -&gt; ..., value
    029 * </PRE>
    030 */
    031public class SIPUSH extends Instruction implements ConstantPushInstruction {
    032
    033    private short b;
    034
    035    /**
    036     * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
    037     */
    038    SIPUSH() {
    039    }
    040
    041    public SIPUSH(final short b) {
    042        super(org.apache.bcel.Const.SIPUSH, (short) 3);
    043        this.b = b;
    044    }
    045
    046    /**
    047     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    048     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    049     *
    050     * @param v Visitor object
    051     */
    052    @Override
    053    public void accept(final Visitor v) {
    054        v.visitPushInstruction(this);
    055        v.visitStackProducer(this);
    056        v.visitTypedInstruction(this);
    057        v.visitConstantPushInstruction(this);
    058        v.visitSIPUSH(this);
    059    }
    060
    061    /**
    062     * Dump instruction as short code to stream out.
    063     */
    064    @Override
    065    public void dump(final DataOutputStream out) throws IOException {
    066        super.dump(out);
    067        out.writeShort(b);
    068    }
    069
    070    /**
    071     * @return Type.SHORT
    072     */
    073    @Override
    074    public Type getType(final ConstantPoolGen cp) {
    075        return Type.SHORT;
    076    }
    077
    078    @Override
    079    public Number getValue() {
    080        return Integer.valueOf(b);
    081    }
    082
    083    /**
    084     * Read needed data (e.g. index) from file.
    085     */
    086    @Override
    087    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    088        super.setLength(3);
    089        b = bytes.readShort();
    090    }
    091
    092    /**
    093     * @return mnemonic for instruction
    094     */
    095    @Override
    096    public String toString(final boolean verbose) {
    097        return super.toString(verbose) + " " + b;
    098    }
    099}