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1 // Copyright 2008 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // 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.tapestry5.internal.services;
16
17 import org.apache.tapestry5.EventConstants;
18 import org.apache.tapestry5.internal.InternalConstants;
19 import org.apache.tapestry5.internal.structure.Page;
20 import org.apache.tapestry5.services;
21
22 import java.io.IOException;
23
24 public class ImmediateActionRenderResponseFilter implements ComponentEventRequestFilter
25 {
26 private final Request request;
27
28 private final Response response;
29
30 private final PageResponseRenderer renderer;
31
32 public ImmediateActionRenderResponseFilter(Request request, PageResponseRenderer renderer, Response response)
33 {
34 this.request = request;
35 this.renderer = renderer;
36 this.response = response;
37 }
38
39 public void handle(ComponentEventRequestParameters parameters, ComponentEventRequestHandler handler)
40 throws IOException
41 {
42 handler.handle(parameters);
43
44 // If markup or a redirect has already been generated, then we're good.
45
46 if (response.isCommitted()) return;
47
48 // Otherwise, we should be operating in immediate mode. Figure out which page
49 // was selected to render.
50
51 Page page = (Page) request.getAttribute(InternalConstants.IMMEDIATE_RESPONSE_PAGE_ATTRIBUTE);
52
53 if (page != null)
54 {
55 // We don't have a context to provide but this still nags me as not the right thing to do.
56
57 page.getRootElement().triggerEvent(EventConstants.ACTIVATE, new Object[0], null);
58
59 renderer.renderPageResponse(page);
60 return;
61 }
62
63 throw new IllegalStateException(
64 "Sanity check - neither a stream response nor a redirect response was generated for this action request.");
65 }
66 }