01: // Copyright 2006 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // Unless required by applicable law or agreed to in writing, software
10: // distributed under the License is distributed on an "AS IS" BASIS,
11: // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12: // See the License for the specific language governing permissions and
13: // limitations under the License.
14:
15: package org.apache.tapestry.ioc;
16:
17: /**
18: * A service decorator is derived from a {@link org.apache.tapestry.ioc.def.DecoratorDef} and is
19: * responsible for building an interceptor around an existing implementation (called the
20: * "delegate").
21: *
22: *
23: */
24: public interface ServiceDecorator {
25: /**
26: * Creates a new interceptor object implementing the same service interface as the delegate
27: * object.
28: *
29: * @param delegate
30: * an existing object implementing the service interface.
31: * @return a new object implementing the same service interface, or delegate or null if the
32: * decorator chooses not to create a new interceptor.
33: */
34: public Object createInterceptor(Object delegate);
35: }
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