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Java > Open Source Codes > org > apache > cayenne > dataview > DOComboBoxModel


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16  * specific language governing permissions and limitations
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19
20 package org.apache.cayenne.dataview;
21
22 import javax.swing.ComboBoxModel JavaDoc;
23
24 import org.apache.cayenne.DataObject;
25
26 /**
27  * A ComboBoxModel to display DataObjects.
28  *
29  * @since 1.1
30  * @author Andriy Shapochka
31  */
32 public class DOComboBoxModel extends DOListModel implements ComboBoxModel JavaDoc {
33
34     protected DataObject selectedObject;
35
36     public DOComboBoxModel() {
37     }
38
39     public void setSelectedDataObject(DataObject dataObject) {
40         if ((selectedObject != null && !selectedObject.equals(dataObject))
41                 || selectedObject == null
42                 && dataObject != null) {
43             selectedObject = dataObject;
44             fireContentsChanged(this, -1, -1);
45         }
46     }
47
48     public DataObject getSelectedDataObject() {
49         return selectedObject;
50     }
51
52     public void setSelectedItem(Object JavaDoc selectedValue) {
53         if (viewField == null) {
54             if (selectedValue instanceof DataObject)
55                 setSelectedDataObject((DataObject) selectedValue);
56             else
57                 setSelectedDataObject(null);
58         }
59         else {
60             LookupCache cache = viewField.getOwner().getOwner().getLookupCache();
61             setSelectedDataObject(cache.getDataObject(viewField, selectedValue));
62         }
63     }
64
65     public Object JavaDoc getSelectedItem() {
66         if (viewField == null)
67             return getSelectedDataObject();
68         return viewField.getValue(getSelectedDataObject());
69     }
70 }
71
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