View Javadoc

1   /* This file is part of COPAL (COntext Provisioning for All).
2    *
3    * COPAL is a part of SM4All (Smart hoMes for All) project.
4    *
5    * COPAL is free software: you can redistribute it and/or modify
6    * it under the terms of the GNU Lesser General Public License as published by
7    * the Free Software Foundation, either version 3 of the License, or
8    * (at your option) any later version.
9    *
10   * COPAL is distributed in the hope that it will be useful,
11   * but WITHOUT ANY WARRANTY; without even the implied warranty of
12   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13   * GNU Lesser General Public License for more details.
14   *
15   * You should have received a copy of the GNU Lesser General Public License
16   * along with COPAL. If not, see <http://www.gnu.org/licenses/>.
17   */
18  package at.ac.tuwien.infosys.sm4all.copal.rest.internal;
19  
20  import at.ac.tuwien.infosys.sm4all.copal.api.osgi.GenericActivator;
21  import at.ac.tuwien.infosys.sm4all.copal.api.service.ContextProcessorRegistry;
22  
23  /**
24   * This tracker set and unsets the {@link ContextProcessorRegistry} service with
25   * {@link ServiceImpl} as it changes its availability.
26   * 
27   * @author sanjin
28   */
29  public class ContextProcessorRegistryTracker extends GenericActivator {
30  
31      private final ServiceImpl service;
32  
33      /**
34       * Creates instance of {@link ContextProcessorRegistry} OSGi Tracker for
35       * specified {@link ServiceImpl}.
36       * 
37       * @param service the {@link ServiceImpl}.
38       */
39      public ContextProcessorRegistryTracker(final ServiceImpl service) {
40          super(ContextProcessorRegistry.class.getName());
41  
42          this.service = service;
43      }
44  
45      @Override
46      protected void start() {
47          final ContextProcessorRegistry processorRegistry = getDependency(ContextProcessorRegistry.class.getName());
48  
49          this.service.setProcessorRegistry(processorRegistry);
50      }
51  
52      @Override
53      protected void stop() {
54          this.service.setProcessorRegistry(null);
55      }
56  }