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.api.event.xml;
19  
20  import org.w3c.dom.Element;
21  import at.ac.tuwien.infosys.sm4all.copal.api.event.ContextEvent;
22  import at.ac.tuwien.infosys.sm4all.copal.api.util.FailedUnmarshallingException;
23  import at.ac.tuwien.infosys.sm4all.copal.api.util.InvalidFieldValueException;
24  
25  /**
26   * The COPAL element for the event's priority,
27   * 
28   * @author sanjin
29   */
30  public class Priority extends ConcreteElement<Integer> {
31  
32      @Override
33      protected Integer retrieve(final Element element) throws FailedUnmarshallingException {
34          if (element == null)
35              throw new NullPointerException("XML DOM element cannot be null.");
36  
37          final Integer result;
38  
39          try {
40              final String textContent = element.getTextContent().trim();
41              if (textContent.isEmpty())
42                  throw new InvalidFieldValueException(
43                          "Priority is empty or blank.");
44              result = Integer.parseInt(textContent);
45          } catch (final NumberFormatException ex) {
46              throw new InvalidFieldValueException("Priority is not a number.");
47          }
48  
49          return result;
50      }
51  
52      @Override
53      public void update(final Element element, final ContextEvent event) {
54          if (element == null)
55              throw new NullPointerException("XML DOM element cannot be null.");
56          if (event == null)
57              throw new NullPointerException("Context event cannot be null.");
58  
59          element.setTextContent(String.valueOf(event.getPriority()));
60      }
61  
62      /**
63       * Singleton instance.
64       */
65      public static final Priority INSTANCE = new Priority();
66  
67      private Priority() {
68          super(int.class);
69      }
70  }