org.openscada.da.ui.widgets.realtime.ItemCellLabelProvider.java Source code

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Here is the source code for org.openscada.da.ui.widgets.realtime.ItemCellLabelProvider.java

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/*
 * This file is part of the OpenSCADA project
 * Copyright (C) 2006-2012 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;

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) {
        cell.setFont(listEntry.getFont());
        cell.setForeground(listEntry.getForeground());
        cell.setBackground(listEntry.getBackground());

        switch (cell.getColumnIndex()) {
        case 0:
            cell.setImage(listEntry.getImage());
            cell.setText(listEntry.getDataItem().getItem().getId());
            break;
        case 1:
            if (listEntry.getSubscriptionError() != null) {
                cell.setText(String.format("%s (%s)", listEntry.getSubscriptionState(), //$NON-NLS-1$
                        listEntry.getSubscriptionError().getMessage()));
            } 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();
    }

}