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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.commons.compress.harmony.unpack200.bytecode;
18  
19  import java.io.DataOutputStream;
20  import java.io.IOException;
21  
22  /**
23   * Enclosing method class file attribute.
24   */
25  public class EnclosingMethodAttribute extends Attribute {
26  
27      private static CPUTF8 attributeName;
28  
29      public static void setAttributeName(final CPUTF8 cpUTF8Value) {
30          attributeName = cpUTF8Value;
31      }
32  
33      private int classIndex;
34      private int methodIndex;
35      private final CPClass cpClass;
36  
37      private final CPNameAndType method;
38  
39      public EnclosingMethodAttribute(final CPClass cpClass, final CPNameAndType method) {
40          super(attributeName);
41          this.cpClass = cpClass;
42          this.method = method;
43      }
44  
45      /*
46       * (non-Javadoc)
47       *
48       * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#getLength()
49       */
50      @Override
51      protected int getLength() {
52          return 4;
53      }
54  
55      @Override
56      protected ClassFileEntry[] getNestedClassFileEntries() {
57          if (method != null) {
58              return new ClassFileEntry[] { attributeName, cpClass, method };
59          }
60          return new ClassFileEntry[] { attributeName, cpClass };
61      }
62  
63      @Override
64      protected void resolve(final ClassConstantPool pool) {
65          super.resolve(pool);
66          cpClass.resolve(pool);
67          classIndex = pool.indexOf(cpClass);
68          if (method != null) {
69              method.resolve(pool);
70              methodIndex = pool.indexOf(method);
71          } else {
72              methodIndex = 0;
73          }
74      }
75  
76      /*
77       * (non-Javadoc)
78       *
79       * @see org.apache.commons.compress.harmony.unpack200.bytecode.ClassFileEntry#toString()
80       */
81      @Override
82      public String toString() {
83          return "EnclosingMethod";
84      }
85  
86      /*
87       * (non-Javadoc)
88       *
89       * @see org.apache.commons.compress.harmony.unpack200.bytecode.Attribute#writeBody(java.io.DataOutputStream)
90       */
91      @Override
92      protected void writeBody(final DataOutputStream dos) throws IOException {
93          dos.writeShort(classIndex);
94          dos.writeShort(methodIndex);
95      }
96  
97  }