1 /*
2 * Copyright (C) 2007-2012 Argeo GmbH
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.argeo.eclipse.ui;
17
18 import org.eclipse.jface.viewers.Viewer;
19 import org.eclipse.jface.viewers.ViewerComparator;
20
21 public abstract class GenericTableComparator extends ViewerComparator {
22 private static final long serialVersionUID = -1175894935075325810L;
23 protected int propertyIndex;
24 public static final int ASCENDING = 0, DESCENDING = 1;
25 protected int direction = DESCENDING;
26
27 /**
28 * Creates an instance of a sorter for TableViewer.
29 *
30 * @param defaultColumnIndex
31 * the default sorter column
32 */
33
34 public GenericTableComparator(int defaultColumnIndex, int direction) {
35 propertyIndex = defaultColumnIndex;
36 this.direction = direction;
37 }
38
39 public void setColumn(int column) {
40 if (column == this.propertyIndex) {
41 // Same column as last sort; toggle the direction
42 direction = 1 - direction;
43 } else {
44 // New column; do a descending sort
45 this.propertyIndex = column;
46 direction = DESCENDING;
47 }
48 }
49
50 /**
51 * Must be Overriden in each view.
52 */
53 public abstract int compare(Viewer viewer, Object e1, Object e2);
54 }