com.softberries.klerk.gui.helpers.table.SimpleKlerkComparator.java Source code

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Here is the source code for com.softberries.klerk.gui.helpers.table.SimpleKlerkComparator.java

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/*******************************************************************************
 * 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;
        }
    }

}