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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.api.query;
19  
20  import at.ac.tuwien.infosys.sm4all.copal.api.util.Observer;
21  
22  /**
23   * Interface to be implemented by observers which are interested on
24   * notifications of {@link ContextQuery}'s state changes.
25   * 
26   * @author sanjin
27   */
28  public interface QueryObserver extends Observer<QueryState, ContextQuery> {
29  
30      /**
31       * Called when specified {@link ContextQuery} changes its {@link QueryState}
32       * .
33       * 
34       * @param state the {@link QueryState}.
35       * @param query the {@link ContextQuery}.
36       */
37      @Override
38      void update(QueryState state, ContextQuery query);
39  }