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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.classfile;
19  
20  import java.io.DataInput;
21  import java.io.DataOutputStream;
22  import java.io.IOException;
23  
24  import org.apache.bcel.Const;
25  
26  /**
27   * This class is derived from the abstract {@link Constant}
28   * and represents a reference to a method type.
29   *
30   * @see     Constant
31   * @since 6.0
32   */
33  public final class ConstantMethodType extends Constant {
34  
35      private int descriptor_index;
36  
37  
38      /**
39       * Initialize from another object.
40       */
41      public ConstantMethodType(final ConstantMethodType c) {
42          this(c.getDescriptorIndex());
43      }
44  
45  
46      /**
47       * Initialize instance from file data.
48       *
49       * @param file Input stream
50       * @throws IOException
51       */
52      ConstantMethodType(final DataInput file) throws IOException {
53          this(file.readUnsignedShort());
54      }
55  
56  
57      public ConstantMethodType(final int descriptor_index) {
58          super(Const.CONSTANT_MethodType);
59          this.descriptor_index = descriptor_index;
60      }
61  
62  
63      /**
64       * Called by objects that are traversing the nodes of the tree implicitly
65       * defined by the contents of a Java class. I.e., the hierarchy of methods,
66       * fields, attributes, etc. spawns a tree of objects.
67       *
68       * @param v Visitor object
69       */
70      @Override
71      public void accept( final Visitor v ) {
72          v.visitConstantMethodType(this);
73      }
74  
75  
76      /**
77       * Dump name and signature index to file stream in binary format.
78       *
79       * @param file Output file stream
80       * @throws IOException
81       */
82      @Override
83      public final void dump( final DataOutputStream file ) throws IOException {
84          file.writeByte(super.getTag());
85          file.writeShort(descriptor_index);
86      }
87  
88  
89      public int getDescriptorIndex() {
90          return descriptor_index;
91      }
92  
93  
94      public void setDescriptorIndex(final int descriptor_index) {
95          this.descriptor_index = descriptor_index;
96      }
97  
98  
99      /**
100      * @return String representation
101      */
102     @Override
103     public final String toString() {
104         return super.toString() + "(descriptor_index = " + descriptor_index + ")";
105     }
106 }