org.csstudio.alarm.beast.msghist.gui.SeverityLabelProvider.java Source code

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Here is the source code for org.csstudio.alarm.beast.msghist.gui.SeverityLabelProvider.java

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/*******************************************************************************
 * Copyright (c) 2010 Oak Ridge National Laboratory.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 ******************************************************************************/
package org.csstudio.alarm.beast.msghist.gui;

import org.csstudio.alarm.beast.msghist.model.Message;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Composite;

/** CellLabelProvider that fills cell with property of a Message
 *  and provides coloring assuming that the column displays
 *  a severity.
 *  @author Kay Kasemir
 */
public class SeverityLabelProvider extends PropertyLabelProvider {
    /** Mapping of severities to colors */
    final private SeverityColumnPreference color_prefs;

    /** Constructor
     *  @param property Message property to display in column
     *  @param parent Parent widget, used to register DisposeListener
     *                because we need to dispose the colors
     *  @throws Exception
     */
    public SeverityLabelProvider(final String property, final Composite parent) throws Exception {
        super(property);
        color_prefs = new SeverityColumnPreference(parent);
    }

    @Override
    public void update(ViewerCell cell) {
        final Message message = (Message) cell.getElement();
        final String severity = message.getProperty(property);
        cell.setText(severity);
        final Color color = color_prefs.getColor(severity);
        if (color != null)
            cell.setBackground(color);
    }
}