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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.service.event;
19  
20  import at.ac.tuwien.infosys.sm4all.copal.api.ContextQuery;
21  
22  /**
23   * Interface which actual event system has to implement that COPAL core will use
24   * to delegate registering and unregistering of {@link ContextQuery}s.
25   * 
26   * @author sanjin
27   */
28  public interface ContextQueryRegistry {
29  
30      /**
31       * Register {@link ContextQuery} with event system.
32       * 
33       * @param query the context query.
34       * @return <code>true</code>> if registering was successful;
35       *         <code>false</code> otherwise.
36       */
37      boolean register(ContextQuery query);
38  
39      /**
40       * Unregister {@link ContextQuery} from event system.
41       * 
42       * @param query the context query.
43       * @return <code>true</code>> if unregistering was successful;
44       *         <code>false</code> otherwise.
45       */
46      boolean unregister(ContextQuery query);
47  }