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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  package org.apache.bcel.generic;
18  
19  import java.io.DataOutputStream;
20  import java.io.IOException;
21  
22  import org.apache.bcel.util.ByteSequence;
23  
24  /**
25   * BIPUSH - Push byte on stack
26   *
27   * <PRE>
28   * Stack: ... -&gt; ..., value
29   * </PRE>
30   */
31  public class BIPUSH extends Instruction implements ConstantPushInstruction {
32  
33      private byte b;
34  
35      /**
36       * Empty constructor needed for Instruction.readInstruction. Not to be used otherwise.
37       */
38      BIPUSH() {
39      }
40  
41      /**
42       * Push byte on stack
43       */
44      public BIPUSH(final byte b) {
45          super(org.apache.bcel.Const.BIPUSH, (short) 2);
46          this.b = b;
47      }
48  
49      /**
50       * Call corresponding visitor method(s). The order is: Call visitor methods of implemented interfaces first, then call
51       * methods according to the class hierarchy in descending order, i.e., the most specific visitXXX() call comes last.
52       *
53       * @param v Visitor object
54       */
55      @Override
56      public void accept(final Visitor v) {
57          v.visitPushInstruction(this);
58          v.visitStackProducer(this);
59          v.visitTypedInstruction(this);
60          v.visitConstantPushInstruction(this);
61          v.visitBIPUSH(this);
62      }
63  
64      /**
65       * Dump instruction as byte code to stream out.
66       */
67      @Override
68      public void dump(final DataOutputStream out) throws IOException {
69          super.dump(out);
70          out.writeByte(b);
71      }
72  
73      /**
74       * @return Type.BYTE
75       */
76      @Override
77      public Type getType(final ConstantPoolGen cp) {
78          return Type.BYTE;
79      }
80  
81      @Override
82      public Number getValue() {
83          return Integer.valueOf(b);
84      }
85  
86      /**
87       * Read needed data (e.g. index) from file.
88       */
89      @Override
90      protected void initFromFile(final ByteSequence bytes, final boolean wide) throws IOException {
91          super.setLength(2);
92          b = bytes.readByte();
93      }
94  
95      /**
96       * @return mnemonic for instruction
97       */
98      @Override
99      public String toString(final boolean verbose) {
100         return super.toString(verbose) + " " + b;
101     }
102 }