SimpleKlerkComparator.java

/*******************************************************************************
 * Copyright (c) 2011 Softberries Krzysztof Grajek.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Softberries Krzysztof Grajek - initial API and implementation
 ******************************************************************************/
package com.softberries.klerk.gui.helpers.table;

import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;

public abstract class SimpleKlerkComparator extends ViewerComparator{
	protected int propertyIndex;
	protected static final int DESCENDING = 1;
	protected int direction = DESCENDING;

	public SimpleKlerkComparator() {
		this.propertyIndex = 0;
		direction = DESCENDING;
	}

	public int getDirection() {
		return direction == 1 ? SWT.DOWN : SWT.UP;
	}

	public void setColumn(int column) {
		if (column == this.propertyIndex) {
			// Same column as last sort; toggle the direction
			direction = 1 - direction;
		} else {
			// New column; do an ascending sort
			this.propertyIndex = column;
			direction = DESCENDING;
		}
	}

}