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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   */
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   * SIPUSH - Push short
27   *
28   * <PRE>Stack: ... -&gt; ..., value</PRE>
29   *
30   * @version $Id: SIPUSH.html 1021978 2017-12-09 17:38:21Z ggregory $
31   */
32  public class SIPUSH extends Instruction implements ConstantPushInstruction {
33  
34      private short b;
35  
36  
37      /**
38       * Empty constructor needed for Instruction.readInstruction.
39       * Not to be used otherwise.
40       */
41      SIPUSH() {
42      }
43  
44  
45      public SIPUSH(final short b) {
46          super(org.apache.bcel.Const.SIPUSH, (short) 3);
47          this.b = b;
48      }
49  
50  
51      /**
52       * Dump instruction as short code to stream out.
53       */
54      @Override
55      public void dump( final DataOutputStream out ) throws IOException {
56          super.dump(out);
57          out.writeShort(b);
58      }
59  
60  
61      /**
62       * @return mnemonic for instruction
63       */
64      @Override
65      public String toString( final boolean verbose ) {
66          return super.toString(verbose) + " " + b;
67      }
68  
69  
70      /**
71       * Read needed data (e.g. index) from file.
72       */
73      @Override
74      protected void initFromFile( final ByteSequence bytes, final boolean wide ) throws IOException {
75          super.setLength(3);
76          b = bytes.readShort();
77      }
78  
79  
80      @Override
81      public Number getValue() {
82          return Integer.valueOf(b);
83      }
84  
85  
86      /** @return Type.SHORT
87       */
88      @Override
89      public Type getType( final ConstantPoolGen cp ) {
90          return Type.SHORT;
91      }
92  
93  
94      /**
95       * Call corresponding visitor method(s). The order is:
96       * Call visitor methods of implemented interfaces first, then
97       * call methods according to the class hierarchy in descending order,
98       * i.e., the most specific visitXXX() call comes last.
99       *
100      * @param v Visitor object
101      */
102     @Override
103     public void accept( final Visitor v ) {
104         v.visitPushInstruction(this);
105         v.visitStackProducer(this);
106         v.visitTypedInstruction(this);
107         v.visitConstantPushInstruction(this);
108         v.visitSIPUSH(this);
109     }
110 }