01: // Copyright 2007 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.services;
16:
17: /**
18: * Filter interface for {@link PageRenderRequestHandler}, which allows extra behaviors to be
19: * injected into the processing of a page render request.
20: */
21: public interface PageRenderRequestFilter {
22: /**
23: * Invoked to activate and render a page. The return value of the event handler method(s) for
24: * the activate event may result in an action response generator being returned.
25: *
26: * @param logicalPageName
27: * the logical name of the page to activate and render
28: * @param context
29: * context data, supplied by the page at render time, extracted from the render URL
30: * @param handler
31: * to delegate the invocation to
32: * @return an action response generator, or null if the page simply rendered
33: */
34: ActionResponseGenerator handle(String logicalPageName,
35: String[] context, PageRenderRequestHandler handler);
36: }
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