    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>
    029 * Stack: ... -&gt; ..., value
    030 * </PRE>
    031 *
    032 */
    033public class BIPUSH extends Instruction implements ConstantPushInstruction {
    034
    035    private byte b;
    036
    037    /**
    038     * Empty constructor needed for Instruction.readInstruction. 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     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    053     * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
    054     *
    055     * @param v Visitor object
    056     */
    057    @Override
    058    public void accept(final Visitor v) {
    059        v.visitPushInstruction(this);
    060        v.visitStackProducer(this);
    061        v.visitTypedInstruction(this);
    062        v.visitConstantPushInstruction(this);
    063        v.visitBIPUSH(this);
    064    }
    065
    066    /**
    067     * Dump instruction as byte code to stream out.
    068     */
    069    @Override
    070    public void dump(final DataOutputStream out) throws IOException {
    071        super.dump(out);
    072        out.writeByte(b);
    073    }
    074
    075    /**
    076     * @return Type.BYTE
    077     */
    078    @Override
    079    public Type getType(final ConstantPoolGen cp) {
    080        return Type.BYTE;
    081    }
    082
    083    @Override
    084    public Number getValue() {
    085        return Integer.valueOf(b);
    086    }
    087
    088    /**
    089     * Read needed data (e.g. index) from file.
    090     */
    091    @Override
    092    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    093        super.setLength(2);
    094        b = bytes.readByte();
    095    }
    096
    097    /**
    098     * @return mnemonic for instruction
    099     */
    100    @Override
    101    public String toString(final boolean verbose) {
    102        return super.toString(verbose) + " " + b;
    103    }
    104}