ConfigurationCellLabelProvider.java

/*
 * This file is part of the OpenSCADA project
 * Copyright (C) 2006-2010 TH4 SYSTEMS GmbH (http://th4-systems.com)
 *
 * OpenSCADA is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License version 3
 * only, as published by the Free Software Foundation.
 *
 * OpenSCADA 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 version 3 for more details
 * (a copy is included in the LICENSE file that accompanied this code).
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with OpenSCADA. If not, see
 * <http://opensource.org/licenses/lgpl-3.0.html> for a copy of the LGPLv3 License.
 */

package org.openscada.ca.ui.editor.config;

import java.util.Map;
import java.util.Set;

import org.eclipse.core.databinding.observable.map.IMapChangeListener;
import org.eclipse.core.databinding.observable.map.IObservableMap;
import org.eclipse.core.databinding.observable.map.MapChangeEvent;
import org.eclipse.jface.viewers.LabelProviderChangedEvent;
import org.eclipse.jface.viewers.StyledCellLabelProvider;
import org.eclipse.jface.viewers.ViewerCell;

public class ConfigurationCellLabelProvider extends StyledCellLabelProvider
{

    private final IMapChangeListener mapChangeListener = new IMapChangeListener () {
        @Override
        public void handleMapChange ( final MapChangeEvent event )
        {
            final Set<?> affectedElements = event.diff.getChangedKeys ();
            if ( !affectedElements.isEmpty () )
            {
                final LabelProviderChangedEvent newEvent = new LabelProviderChangedEvent ( ConfigurationCellLabelProvider.this, affectedElements.toArray () );
                fireLabelProviderChanged ( newEvent );
            }
        }
    };

    private final IObservableMap[] attributeMaps;

    public ConfigurationCellLabelProvider ( final IObservableMap... attributeMaps )
    {
        super ();

        for ( int i = 0; i < attributeMaps.length; i++ )
        {
            attributeMaps[i].addMapChangeListener ( this.mapChangeListener );
        }
        this.attributeMaps = attributeMaps;
    }

    @Override
    public void dispose ()
    {
        for ( int i = 0; i < this.attributeMaps.length; i++ )
        {
            this.attributeMaps[i].removeMapChangeListener ( this.mapChangeListener );
        }
        super.dispose ();
    }

    @Override
    public void update ( final ViewerCell cell )
    {
        final Map.Entry<?, ?> cfg = (Map.Entry<?, ?>)cell.getElement ();
        switch ( cell.getColumnIndex () )
        {
        case 0:
            cell.setText ( "" + cfg.getKey () );
            break;
        case 1:
            cell.setText ( "" + cfg.getValue () );
            break;
        }
        super.update ( cell );
    }
}