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 * BIPUSH - Push byte on stack
027 *
028 * <PRE>Stack: ... -&gt; ..., value</PRE>
029 *
030 * @version $Id: BIPUSH.java 1747278 2016-06-07 17:28:43Z britter $
031 */
032public class BIPUSH extends Instruction implements ConstantPushInstruction {
033
034    private byte b;
035
036
037    /**
038     * Empty constructor needed for the Class.newInstance() statement in
039     * Instruction.readInstruction(). Not to be used otherwise.
040     */
041    BIPUSH() {
042    }
043
044
045    /** Push byte on stack
046     */
047    public BIPUSH(final byte b) {
048        super(org.apache.bcel.Const.BIPUSH, (short) 2);
049        this.b = b;
050    }
051
052
053    /**
054     * Dump instruction as byte code to stream out.
055     */
056    @Override
057    public void dump( final DataOutputStream out ) throws IOException {
058        super.dump(out);
059        out.writeByte(b);
060    }
061
062
063    /**
064     * @return mnemonic for instruction
065     */
066    @Override
067    public String toString( final boolean verbose ) {
068        return super.toString(verbose) + " " + b;
069    }
070
071
072    /**
073     * Read needed data (e.g. index) from file.
074     */
075    @Override
076    protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
077        super.setLength(2);
078        b = bytes.readByte();
079    }
080
081
082    @Override
083    public Number getValue() {
084        return Integer.valueOf(b);
085    }
086
087
088    /** @return Type.BYTE
089     */
090    @Override
091    public Type getType( final ConstantPoolGen cp ) {
092        return Type.BYTE;
093    }
094
095
096    /**
097     * Call corresponding visitor method(s). The order is:
098     * Call visitor methods of implemented interfaces first, then
099     * call methods according to the class hierarchy in descending order,
100     * i.e., the most specific visitXXX() call comes last.
101     *
102     * @param v Visitor object
103     */
104    @Override
105    public void accept( final Visitor v ) {
106        v.visitPushInstruction(this);
107        v.visitStackProducer(this);
108        v.visitTypedInstruction(this);
109        v.visitConstantPushInstruction(this);
110        v.visitBIPUSH(this);
111    }
112}