org.bbaw.pdr.ae.view.control.comparator.PdrObjectViewComparator.java Source code

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Here is the source code for org.bbaw.pdr.ae.view.control.comparator.PdrObjectViewComparator.java

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/**
 * This file is part of Archiv-Editor.
 * 
 * The software Archiv-Editor serves as a client user interface for working with
 * the Person Data Repository. See: pdr.bbaw.de
 * 
 * The software Archiv-Editor was developed at the Berlin-Brandenburg Academy
 * of Sciences and Humanities, Jgerstr. 22/23, D-10117 Berlin.
 * www.bbaw.de
 * 
 * Copyright (C) 2010-2013  Berlin-Brandenburg Academy
 * of Sciences and Humanities
 * 
 * The software Archiv-Editor was developed by @author: Christoph Plutte.
 * 
 * Archiv-Editor is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * Archiv-Editor 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with Archiv-Editor.  
 * If not, see <http://www.gnu.org/licenses/lgpl-3.0.html>.
 */
package org.bbaw.pdr.ae.view.control.comparator;

import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;

/**
 * The Class PdrObjectViewComparator.
 * @author Christoph Plutte
 */
public class PdrObjectViewComparator extends ViewerComparator {

    /** The property index. */
    private int _propertyIndex;

    /** The Constant DESCENDING. */
    private static final int DESCENDING = 1;

    /** The direction. */
    private int _direction = DESCENDING;

    /**
     * Instantiates a new pdr object view comparator.
     */
    public PdrObjectViewComparator() {
        this._propertyIndex = 0;
        _direction = DESCENDING;
    }

    @Override
    public final int compare(final Viewer viewer, final Object e1, final Object e2) {
        ITableLabelProvider tlp = (ITableLabelProvider) ((TableViewer) viewer).getLabelProvider();
        int rc = 0;
        rc = tlp.getColumnText(e1, _propertyIndex).compareTo(tlp.getColumnText(e2, _propertyIndex));

        // If descending order, flip the direction
        if (_direction == DESCENDING) {
            rc = -rc;
        }
        return rc;
    }

    /**
     * Sets the column.
     * @param column the new column
     */
    public final void setColumn(final 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;
        }
    }

}