    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one
    003 * or more contributor license agreements.  See the NOTICE file
    004 * distributed with this work for additional information
    005 * regarding copyright ownership.  The ASF licenses this file
    006 * to you under the Apache License, Version 2.0 (the
    007 * "License"); you may not use this file except in compliance
    008 * with the License.  You may obtain a copy of the License at
    009 *
    010 *   https://www.apache.org/licenses/LICENSE-2.0
    011 *
    012 * Unless required by applicable law or agreed to in writing,
    013 * software distributed under the License is distributed on an
    014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    015 * KIND, either express or implied.  See the License for the
    016 * specific language governing permissions and limitations
    017 * under the License.
    018 */
    019package org.apache.bcel.generic;
    020
    021import java.io.DataOutputStream;
    022import java.io.IOException;
    023
    024import org.apache.bcel.util.ByteSequence;
    025
    026/**
    027 * BIPUSH - Push byte on stack
    028 *
    029 * <PRE>
    030 * Stack: ... -&gt; ..., value
    031 * </PRE>
    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     * @param b the byte value to push.
    047     */
    048    public BIPUSH(final byte b) {
    049        super(org.apache.bcel.Const.BIPUSH, (short) 2);
    050        this.b = b;
    051    }
    052
    053    /**
    054     * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
    055     * methods according to the class hierarchy in descending order, that is, the most specific visitXXX() call comes last.
    056     *
    057     * @param v Visitor object.
    058     */
    059    @Override
    060    public void accept(final Visitor v) {
    061        v.visitPushInstruction(this);
    062        v.visitStackProducer(this);
    063        v.visitTypedInstruction(this);
    064        v.visitConstantPushInstruction(this);
    065        v.visitBIPUSH(this);
    066    }
    067
    068    /**
    069     * Dumps instruction as byte code to stream out.
    070     */
    071    @Override
    072    public void dump(final DataOutputStream out) throws IOException {
    073        super.dump(out);
    074        out.writeByte(b);
    075    }
    076
    077    /**
    078     * @return Type.BYTE.
    079     */
    080    @Override
    081    public Type getType(final ConstantPoolGen cp) {
    082        return Type.BYTE;
    083    }
    084
    085    @Override
    086    public Number getValue() {
    087        return Integer.valueOf(b);
    088    }
    089
    090    /**
    091     * Reads needed data (for example index) from file.
    092     */
    093    @Override
    094    protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
    095        super.setLength(2);
    096        b = bytes.readByte();
    097    }
    098
    099    /**
    100     * @return mnemonic for instruction.
    101     */
    102    @Override
    103    public String toString(final boolean verbose) {
    104        return super.toString(verbose) + " " + b;
    105    }
    106}