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