/*******************************************************************************
 * Copyright (c) 2008 IBM Corporation and others.
 * 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
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/

package org.eclipse.ui.internal.views.markers;

import org.eclipse.core.resources.IMarker;
import org.eclipse.jface.viewers.ViewerCell;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.views.markers.MarkerItem;

/**
 * MarkerSeverityAndDescriptionField can handle severities for all markers.
 * 
 * @since 3.4
 * 
 */
public class MarkerSeverityAndDescriptionField extends MarkerDescriptionField {

	/**
	 * Create a new instance of the receiver.
	 */
	public MarkerSeverityAndDescriptionField() {
		super();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.provisional.views.markers.IMarkerField#compare(org.eclipse.ui.provisional.views.markers.MarkerItem,
	 *      org.eclipse.ui.provisional.views.markers.MarkerItem)
	 */
	public int compare(MarkerItem item1, MarkerItem item2) {

		int severity1 = MarkerSupportInternalUtilities.getSeverity(item1);
		int severity2 = MarkerSupportInternalUtilities.getSeverity(item2);
		if (severity1 == severity2)
			return super.compare(item1, item2);
		return severity2 - severity1;
	}

	/**
	 * Return the image for item.
	 * 
	 * @param item
	 * @return Image or <code>null</code>
	 */
	private Image getImage(MarkerItem item) {

		int severity = -1;
		if (item.getMarker() == null)
			severity = ((MarkerCategory) item).getHighestSeverity();
		else
			severity = MarkerSupportInternalUtilities.getSeverity(item);			

		if (severity >= IMarker.SEVERITY_WARNING)
			return MarkerSupportInternalUtilities.getSeverityImage(severity);
		return null;

	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.MarkerField#update(org.eclipse.jface.viewers.ViewerCell)
	 */
	public void update(ViewerCell cell) {
		super.update(cell);

		MarkerItem item = (MarkerItem) cell.getElement();
		cell.setImage(annotateImage(item, getImage(item)));
	}
}