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Java > Open Source Codes > org > apache > hivemind > service > impl > ServicePropertyObjectProvider


1 // Copyright 2004, 2005 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.hivemind.service.impl;
16
17 import org.apache.hivemind.ApplicationRuntimeException;
18 import org.apache.hivemind.Location;
19 import org.apache.hivemind.internal.Module;
20 import org.apache.hivemind.service.ObjectProvider;
21 import org.apache.hivemind.util.PropertyUtils;
22
23 /**
24  * {@link org.apache.hivemind.service.ObjectProvider} implementation
25  * that obtains a named property from a service. This provider is
26  * mapped to the prefix "service-property", the service id is seperated
27  * from the property name by a colon. Example:
28  * <code>service-property:MyService:myProperty</code>
29  *
30  * @author Howard Lewis Ship
31  */
32 public class ServicePropertyObjectProvider implements ObjectProvider
33 {
34
35     public Object JavaDoc provideObject(
36         Module contributingModule,
37         Class JavaDoc propertyType,
38         String JavaDoc locator,
39         Location location)
40     {
41         int commax = locator.indexOf(':');
42
43         if (commax < 2)
44         {
45             throw new ApplicationRuntimeException(
46                 ServiceMessages.invalidServicePropertyLocator(locator),
47                 location,
48                 null);
49         }
50
51         String JavaDoc serviceId = locator.substring(0, commax);
52         String JavaDoc propertyName = locator.substring(commax + 1);
53
54         Object JavaDoc service = contributingModule.getService(serviceId, Object JavaDoc.class);
55
56         return PropertyUtils.read(service, propertyName);
57     }
58
59 }
60
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