1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 * 17 */ 18 package org.apache.bcel.generic; 19 20 import java.io.DataOutputStream; 21 import java.io.IOException; 22 23 import org.apache.bcel.util.ByteSequence; 24 25 /** 26 * BIPUSH - Push byte on stack 27 * 28 * <PRE>Stack: ... -> ..., value</PRE> 29 * 30 * @version $Id$ 31 */ 32 public class BIPUSH extends Instruction implements ConstantPushInstruction { 33 34 private byte b; 35 36 37 /** 38 * Empty constructor needed for Instruction.readInstruction. 39 * Not to be used otherwise. 40 */ BIPUSH()41 BIPUSH() { 42 } 43 44 45 /** Push byte on stack 46 */ BIPUSH(final byte b)47 public BIPUSH(final byte b) { 48 super(org.apache.bcel.Const.BIPUSH, (short) 2); 49 this.b = b; 50 } 51 52 53 /** 54 * Dump instruction as byte code to stream out. 55 */ 56 @Override dump( final DataOutputStream out )57 public void dump( final DataOutputStream out ) throws IOException { 58 super.dump(out); 59 out.writeByte(b); 60 } 61 62 63 /** 64 * @return mnemonic for instruction 65 */ 66 @Override toString( final boolean verbose )67 public String toString( final boolean verbose ) { 68 return super.toString(verbose) + " " + b; 69 } 70 71 72 /** 73 * Read needed data (e.g. index) from file. 74 */ 75 @Override initFromFile( final ByteSequence bytes, final boolean wide )76 protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException { 77 super.setLength(2); 78 b = bytes.readByte(); 79 } 80 81 82 @Override getValue()83 public Number getValue() { 84 return Integer.valueOf(b); 85 } 86 87 88 /** @return Type.BYTE 89 */ 90 @Override getType( final ConstantPoolGen cp )91 public Type getType( final ConstantPoolGen cp ) { 92 return Type.BYTE; 93 } 94 95 96 /** 97 * Call corresponding visitor method(s). The order is: 98 * Call visitor methods of implemented interfaces first, then 99 * 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 accept( final Visitor v )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 } 113