eclipse/plugins/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/GenericTableComparator.java

   1 package org.argeo.eclipse.ui;
   2
   3 import org.eclipse.jface.viewers.Viewer;
   4 import org.eclipse.jface.viewers.ViewerComparator;
   5
   6 public abstract class GenericTableComparator extends ViewerComparator {
   7
   8         protected int propertyIndex;
   9         public static final int ASCENDING = 0, DESCENDING = 1;
  10         protected int direction = DESCENDING;
  11
  12         /**
  13          * Creates an instance of a sorter for TableViewer.
  14          *
  15          * @param defaultColumn
  16          *            the default sorter column
  17          */
  18
  19         public GenericTableComparator(int defaultColumnIndex, int direction) {
  20                 propertyIndex = defaultColumnIndex;
  21                 this.direction = direction;
  22         }
  23
  24         public void setColumn(int column) {
  25                 if (column == this.propertyIndex) {
  26                         // Same column as last sort; toggle the direction
  27                         direction = 1 - direction;
  28                 } else {
  29                         // New column; do a descending sort
  30                         this.propertyIndex = column;
  31                         direction = DESCENDING;
  32                 }
  33         }
  34
  35         /**
  36          * Must be Overriden in each view.
  37          */
  38         public abstract int compare(Viewer viewer, Object e1, Object e2);
  39 }