+ Finalization of history request

[lgpl/argeo-commons.git] / eclipse / plugins / org.argeo.eclipse.ui / src / main / java / org / argeo / eclipse / ui / GenericTableComparator.java

diff --git a/eclipse/plugins/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/GenericTableComparator.java b/eclipse/plugins/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/GenericTableComparator.java
new file mode 100644 (file)
index 0000000..4c3ee69
--- /dev/null
+++ b/eclipse/plugins/org.argeo.eclipse.ui/src/main/java/org/argeo/eclipse/ui/GenericTableComparator.java
@@ -0,0 +1,39 @@
+package org.argeo.eclipse.ui;
+
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.jface.viewers.ViewerComparator;
+
+public abstract class GenericTableComparator extends ViewerComparator {
+
+       protected int propertyIndex;
+       public static final int ASCENDING = 0, DESCENDING = 1;
+       protected int direction = DESCENDING;
+
+       /**
+        * Creates an instance of a sorter for TableViewer.
+        * 
+        * @param defaultColumn
+        *            the default sorter column
+        */
+
+       public GenericTableComparator(int defaultColumnIndex, int direction) {
+               propertyIndex = defaultColumnIndex;
+               this.direction = direction;
+       }
+
+       public void setColumn(int column) {
+               if (column == this.propertyIndex) {
+                       // Same column as last sort; toggle the direction
+                       direction = 1 - direction;
+               } else {
+                       // New column; do a descending sort
+                       this.propertyIndex = column;
+                       direction = DESCENDING;
+               }
+       }
+
+       /**
+        * Must be Overriden in each view.
+        */
+       public abstract int compare(Viewer viewer, Object e1, Object e2);
+}