swt/org.argeo.cms.swt/src/org/argeo/eclipse/ui/AbstractTreeContentProvider.java

   1 package org.argeo.eclipse.ui;
   2
   3 import org.argeo.cms.ux.widgets.TreeParent;
   4 import org.eclipse.jface.viewers.ITreeContentProvider;
   5 import org.eclipse.jface.viewers.Viewer;
   6
   7 /**
   8  * Tree content provider dealing with tree objects and providing reasonable
   9  * defaults.
  10  */
  11 public abstract class AbstractTreeContentProvider implements
  12                 ITreeContentProvider {
  13         private static final long serialVersionUID = 8246126401957763868L;
  14
  15         /** Does nothing */
  16         public void dispose() {
  17         }
  18
  19         /** Does nothing */
  20         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  21         }
  22
  23         public Object[] getChildren(Object element) {
  24                 if (element instanceof TreeParent) {
  25                         return ((TreeParent) element).getChildren();
  26                 }
  27                 return new Object[0];
  28         }
  29
  30         public Object getParent(Object element) {
  31                 if (element instanceof TreeParent) {
  32                         return ((TreeParent) element).getParent();
  33                 }
  34                 return null;
  35         }
  36
  37         public boolean hasChildren(Object element) {
  38                 if (element instanceof TreeParent) {
  39                         return ((TreeParent) element).hasChildren();
  40                 }
  41                 return false;
  42         }
  43 }