01: /*
02: * Licensed to the Apache Software Foundation (ASF) under one or more
03: * contributor license agreements. See the NOTICE file distributed with
04: * this work for additional information regarding copyright ownership.
05: * The ASF licenses this file to You under the Apache License, Version 2.0
06: * (the "License"); you may not use this file except in compliance with
07: * the License. You may obtain a copy of the License at
08: *
09: * http://www.apache.org/licenses/LICENSE-2.0
10: *
11: * Unless required by applicable law or agreed to in writing, software
12: * distributed under the License is distributed on an "AS IS" BASIS,
13: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: * See the License for the specific language governing permissions and
15: * limitations under the License.
16: *
17: * $Header:$
18: */
19: package org.apache.beehive.controls.api.events;
20:
21: import java.lang.reflect.InvocationTargetException;
22:
23: import org.apache.beehive.controls.api.context.ControlContainerContext;
24: import org.apache.beehive.controls.api.context.ControlHandle;
25: import org.apache.beehive.controls.api.context.ControlThreadContext;
26:
27: /**
28: * The EventDispatchHelper class is a simple implementation of the EventDispatcher interface
29: * that is suitable for use <b>inside</b> the execution context of a control container. It
30: * assumes that you are already running inside the target container instance, and all that is
31: * required is the correct routing of the event to the correct control.
32: */
33: public class EventDispatchHelper implements EventDispatcher {
34: public Object dispatchEvent(ControlHandle target, EventRef event,
35: Object[] args) throws IllegalAccessException,
36: IllegalArgumentException, InvocationTargetException {
37: //
38: // Obtain the current active control container context
39: //
40: ControlContainerContext context = ControlThreadContext
41: .getContext();
42: if (context == null)
43: throw new IllegalStateException(
44: "No active control container context");
45:
46: //
47: // Dispatch the event using it.
48: //
49: return context.dispatchEvent(target, event, args);
50: }
51: }
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