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.internal.util;
16:
17: import org.apache.tapestry.ComponentEventHandler;
18: import org.apache.tapestry.runtime.Component;
19:
20: /**
21: * A {@link ComponentEventHandler} used for notification events. Event handler methods may return
22: * true (to abort the event) or false (to allow the event to continue bubbling up), but all other
23: * values are forbidden.
24: */
25: public class NotificationEventHandler implements ComponentEventHandler {
26: private final String _eventType;
27:
28: private final String _completeId;
29:
30: public NotificationEventHandler(String eventType, String completeId) {
31: _eventType = eventType;
32: _completeId = completeId;
33: }
34:
35: public boolean handleResult(Object result, Component component,
36: String methodDescription) {
37: if (result instanceof Boolean)
38: return ((Boolean) result);
39:
40: throw new IllegalArgumentException(UtilMessages
41: .noReturnValueAccepted(_eventType, _completeId, result,
42: methodDescription));
43: }
44:
45: }
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