ui/AbstractTreeContentProvider.java

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