01: /**
02: * Copyright 2006 Webmedia Group Ltd.
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: **/package org.araneaframework;
16:
17: /**
18: * Provides objects with the capability of narrowing down to a specific implementation
19: * of an interface added with extend from {@link org.araneaframework.Extendable}.
20: *
21: * @see org.araneaframework.Extendable
22: * @author "Toomas Römer" <toomas@webmedia.ee>
23: * @author Jevgeni Kabanov (ekabanov <i>at</i> araneaframework <i>dot</i> org)
24: */
25: public interface Narrowable {
26:
27: /**
28: * Narrows down to the implementation of the interfaceClass, returns
29: * the object. Can be used after the <code>extend(Class, Object);</code>
30: * if the object implements {@link Extendable}.
31: *
32: * @param interfaceClass the interface of the implementation in need of
33: * @return the implementation of the interfaceClass
34: */
35: public Object narrow(Class interfaceClass);
36: }
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