AttributeFactory


1   /*
2    *  Copyright 2004 Brian S O'Neill
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  
17  package org.cojen.classfile;
18  
19  import java.io.DataInput  ;
20  import java.io.IOException  ;
21  
22  /**
23   * Allows custom {@link Attribute Attributes} to be constructed when a
24   * {@link ClassFile} is read from a stream. The factory will be invoked only
25   * when an unknown type of attribute type is read.
26   *
27   * @author Brian S O'Neill
28   */
29  public interface AttributeFactory {
30      /**
31       * Create an attribute, using the provided name to determine which type.
32       * Return null if attribute type is unknown.
33       *
34       * @param cp ConstantPool, needed for constructing attributes
35       * @param name Name of attribute
36       * @param length Attribute length, in bytes
37       * @param din Attribute data source
38       */
39      Attribute createAttribute(ConstantPool cp, 
40                                String   name,
41                                int length,
42                                DataInput   din) throws IOException  ;
43  }
44

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