    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 $Id$
    031 */
    032public class BIPUSH extends Instruction implements ConstantPushInstruction {
    033
    034    private byte b;
    035
    036
    037    /**
    038     * Empty constructor needed for Instruction.readInstruction.
    039     * 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}