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: ... -> ..., 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}