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  * defaults.
   9  */
  10 public abstract class AbstractTreeContentProvider implements
  11                 ITreeContentProvider {
  12         private static final long serialVersionUID = 8246126401957763868L;
  13
  14         /** Does nothing */
  15         public void dispose() {
  16         }
  17
  18         /** Does nothing */
  19         public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
  20         }
  21
  22         public Object[] getChildren(Object element) {
  23                 if (element instanceof TreeParent) {
  24                         return ((TreeParent) element).getChildren();
  25                 }
  26                 return new Object[0];
  27         }
  28
  29         public Object getParent(Object element) {
  30                 if (element instanceof TreeParent) {
  31                         return ((TreeParent) element).getParent();
  32                 }
  33                 return null;
  34         }
  35
  36         public boolean hasChildren(Object element) {
  37                 if (element instanceof TreeParent) {
  38                         return ((TreeParent) element).hasChildren();
  39                 }
  40                 return false;
  41         }
  42 }