01: /*
02: * Copyright 2004 Brian S O'Neill
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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, String name, int length,
40: DataInput din) throws IOException;
41: }
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