View Javadoc
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: ... -&gt; ..., value</PRE>
29   *
30   */
31  public class BIPUSH extends Instruction implements ConstantPushInstruction {
32  
33      private byte b;
34  
35  
36      /**
37       * Empty constructor needed for Instruction.readInstruction.
38       * Not to be used otherwise.
39       */
40      BIPUSH() {
41      }
42  
43  
44      /** Push byte on stack
45       */
46      public BIPUSH(final byte b) {
47          super(org.apache.bcel.Const.BIPUSH, (short) 2);
48          this.b = b;
49      }
50  
51  
52      /**
53       * Dump instruction as byte code to stream out.
54       */
55      @Override
56      public void dump( final DataOutputStream out ) throws IOException {
57          super.dump(out);
58          out.writeByte(b);
59      }
60  
61  
62      /**
63       * @return mnemonic for instruction
64       */
65      @Override
66      public String toString( final boolean verbose ) {
67          return super.toString(verbose) + " " + b;
68      }
69  
70  
71      /**
72       * Read needed data (e.g. index) from file.
73       */
74      @Override
75      protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
76          super.setLength(2);
77          b = bytes.readByte();
78      }
79  
80  
81      @Override
82      public Number getValue() {
83          return Integer.valueOf(b);
84      }
85  
86  
87      /** @return Type.BYTE
88       */
89      @Override
90      public Type getType( final ConstantPoolGen cp ) {
91          return Type.BYTE;
92      }
93  
94  
95      /**
96       * Call corresponding visitor method(s). The order is:
97       * Call visitor methods of implemented interfaces first, then
98       * call methods according to the class hierarchy in descending order,
99       * 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 }