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