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Java > Open Source Codes > org > cojen > classfile > 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 JavaDoc;
20 import java.io.IOException JavaDoc;
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 JavaDoc name,
41                               int length,
42                               DataInput JavaDoc din) throws IOException JavaDoc;
43 }
44
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