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/*******************************************************************************
* Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
* This file is part of Gluster Management Console.
*
* Gluster Management Console is free software; you can redistribute it and/or
* modify it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Gluster Management Console is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
* for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*******************************************************************************/
package com.gluster.storage.management.console.utils;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
/**
* Comparator for sorting contents of a table viewer
*/
public class TableViewerComparator extends ViewerComparator {
private int column = -1;
private static final int ASCENDING = 0;
private static final int DESCENDING = 1;
private static final int NONE = -1;
private int direction = DESCENDING;
public TableViewerComparator() {
this(NONE);
}
public TableViewerComparator(int direction) {
this.direction = direction;
}
public int getDirection() {
return direction == DESCENDING ? SWT.DOWN : (direction == ASCENDING ? SWT.UP : SWT.NONE);
}
public void setColumn(int column) {
if (column == this.column) {
// Same column as last sort; toggle the direction
direction = 1 - direction;
} else {
// first column selection or new column; do an ascending sort
direction = ASCENDING;
this.column = column;
}
}
@Override
public int compare(Viewer viewer, Object e1, Object e2) {
if(direction == NONE) {
// no sorting
return 0;
}
int result = super.compare(viewer, e1, e2);
// If descending order, flip the direction
if (direction == DESCENDING) {
result = -result;
}
return result;
}
}
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