org.netxms.ui.eclipse.tools.ObjectLabelComparator.java Source code

Introduction

Here is the source code for org.netxms.ui.eclipse.tools.ObjectLabelComparator.java

Source

/**
 * NetXMS - open source network management system
 * Copyright (C) 2003-2011 Victor Kirhenshtein
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
package org.netxms.ui.eclipse.tools;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ITableLabelProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerComparator;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.TableColumn;

/**
 * Generic object comparator for SortableTableViewer - sort objects by labels
 *
 */
public class ObjectLabelComparator extends ViewerComparator {
    private ILabelProvider labelProvider;

    /**
     * The constructor
     * 
     * @param labelProvider label provider
     */
    public ObjectLabelComparator(ILabelProvider labelProvider) {
        this.labelProvider = labelProvider;
    }

    /* (non-Javadoc)
     * @see org.eclipse.jface.viewers.ViewerComparator#compare(org.eclipse.jface.viewers.Viewer, java.lang.Object, java.lang.Object)
     */
    @Override
    public int compare(Viewer viewer, Object e1, Object e2) {
        int rc, column;

        if (((TableViewer) viewer).getTable().getColumnCount() > 0) {
            TableColumn sortColumn = ((TableViewer) viewer).getTable().getSortColumn();
            if (sortColumn == null)
                return 0;

            column = (Integer) sortColumn.getData("ID"); //$NON-NLS-1$
        } else {
            // Table control in simple mode, assume column #0
            column = 0;
        }

        if (labelProvider instanceof ITableLabelProvider) {
            rc = ((ITableLabelProvider) labelProvider).getColumnText(e1, column)
                    .compareToIgnoreCase(((ITableLabelProvider) labelProvider).getColumnText(e2, column));
        } else {
            if (column == 0) {

                rc = labelProvider.getText(e1).compareToIgnoreCase(labelProvider.getText(e2));
            } else {
                rc = 0;
            }
        }
        int dir = ((TableViewer) viewer).getTable().getSortDirection();
        return (dir == SWT.UP) ? rc : -rc;
    }
}