ItemCellLabelProvider.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.da.ui.widgets.realtime;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.jface.resource.ResourceManager;
import org.eclipse.jface.viewers.CellLabelProvider;
import org.eclipse.jface.viewers.ViewerCell;
import org.openscada.core.ui.styles.StyleInformation;

public class ItemCellLabelProvider extends CellLabelProvider
{

    private final ResourceManager resourceManager = new LocalResourceManager ( JFaceResources.getResources () );

    @Override
    public void update ( final ViewerCell cell )
    {
        final Object o = cell.getElement ();
        if ( o instanceof ListEntry )
        {
            updateListEntry ( (ListEntry)o, cell );
        }
        else if ( o instanceof AttributePair )
        {
            updateAttributePair ( (AttributePair)o, cell );
        }
    }

    private void updateAttributePair ( final AttributePair attributePair, final ViewerCell cell )
    {
        switch ( cell.getColumnIndex () )
        {
        case 0:
            cell.setText ( attributePair.key );
            break;
        case 2:
            if ( attributePair.value != null )
            {
                cell.setText ( attributePair.value.getType ().name () );
            }
            break;
        case 3:
            if ( attributePair.value != null )
            {
                cell.setText ( attributePair.value.asString ( "<null>" ) ); //$NON-NLS-1$
            }
            break;
        default:
            break;
        }
    }

    private void updateListEntry ( final ListEntry listEntry, final ViewerCell cell )
    {
        final StyleInformation si = org.openscada.da.ui.styles.Activator.getStyle ( listEntry.getItemValue () );

        if ( si != null )
        {
            if ( si.getBackground () != null )
            {
                cell.setBackground ( this.resourceManager.createColor ( si.getBackground () ) );
            }
            else
            {
                cell.setBackground ( null );
            }

            if ( si.getForeground () != null )
            {
                cell.setForeground ( this.resourceManager.createColor ( si.getForeground () ) );
            }
            else
            {
                cell.setForeground ( null );
            }

            if ( si.getFont () != null )
            {
                cell.setFont ( this.resourceManager.createFont ( si.getFont () ) );
            }
            else
            {
                cell.setFont ( null );
            }
        }

        switch ( cell.getColumnIndex () )
        {
        case 0:
            cell.setText ( listEntry.getDataItem ().getItem ().getId () );
            break;
        case 1:
            if ( listEntry.getSubscriptionError () != null )
            {
                cell.setText ( String.format ( "%s (%s)", listEntry.getSubscriptionState (), listEntry.getSubscriptionError ().getMessage () ) ); //$NON-NLS-1$
            }
            else
            {
                cell.setText ( listEntry.getSubscriptionState ().name () );
            }
            break;
        case 2:
            if ( listEntry.getValue () != null )
            {
                cell.setText ( listEntry.getValue ().getType ().name () );
            }
            break;
        case 3:
            if ( listEntry.getValue () != null )
            {
                cell.setText ( listEntry.getValue ().asString ( "<null>" ) ); //$NON-NLS-1$
            }
            break;
        default:
            break;
        }
    }

    @Override
    public void dispose ()
    {
        this.resourceManager.dispose ();
        super.dispose ();
    }

}