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/*******************************************************************************
 * Copyright (c) 2003 - 2005 University Of British Columbia 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:
 *     University Of British Columbia - initial API and implementation
 *******************************************************************************/
package org.eclipse.mylar.bugzilla.search;

import org.eclipse.core.resources.IMarker;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.viewers.ViewerSorter;
import org.eclipse.mylar.bugzilla.IBugzillaConstants;


/**
 * Sorts results of Bugzilla search by bug state.
 */
public class BugzillaStateSearchSorter extends ViewerSorter {

	/**
	 * Returns a negative, zero, or positive number depending on whether the
	 * first bug's state goes before, is the same as, or goes after the second
	 * element's state.
	 * <p>
	 * 
	 * @see org.eclipse.jface.viewers.ViewerSorter#compare(org.eclipse.jface.viewers.Viewer,
	 *      java.lang.Object, java.lang.Object)
	 */
	@Override
	public int compare(Viewer viewer, Object e1, Object e2) 
	{
		try 
		{
			// cast the object and get its state
			IMarker entry1 = (IMarker) e1;
			Integer state1 = (Integer) entry1.getAttribute(
				IBugzillaConstants.HIT_MARKER_ATTR_STATE);
				
			// cast the other object and get its state
			IMarker entry2 = (IMarker) e2;
			Integer state2 = (Integer) entry2.getAttribute(
				IBugzillaConstants.HIT_MARKER_ATTR_STATE);

			// if neither is null, compare the bugs states
			if (state1 != null && state2 != null) 
			{
				// compare the states
				int rc = state1.compareTo(state2);
				
				// compare the resolution if the states are the same
				if (rc == 0) 
				{
					// get the resolution of the bug
					Integer result1 = (Integer) entry1.getAttribute(
						IBugzillaConstants.HIT_MARKER_ATTR_RESULT);
						
					// get the resolution of the other bug
					Integer result2 = (Integer) entry2.getAttribute(
						IBugzillaConstants.HIT_MARKER_ATTR_RESULT);
					
					// if neither state is null, compare them
					if (result1 != null && result2 != null) 
					{
						rc = result1.compareTo(result2);
					}
				}
				return rc;	
			}

		} 
		catch (Exception ignored) {
			// ignore if there is a problem
		}
		
		// if that didn't work, use the default compare method
		return super.compare(viewer, e1, e2);
	}
	
	/**
	 * Returns the category of the given element. The category is a number used
	 * to allocate elements to bins; the bins are arranged in ascending numeric
	 * order. The elements within a bin are arranged via a second level sort
	 * criterion.
	 * <p>
	 * 
	 * @see org.eclipse.jface.viewers.ViewerSorter#category(Object)
	 */
	@Override
	public int category(Object element) 
	{
		try 
		{
			IMarker marker = (IMarker)element;
			
			// return the bugs id
			if (marker.getType().equals(IBugzillaConstants.HIT_MARKER_ID)) 
			{
				return ((Integer)marker.getAttribute(IBugzillaConstants.HIT_MARKER_ATTR_ID)).intValue();
			}
		} 
		catch (Exception ignored) {
			// ignore if there is a problem
		}
		
		// if that didn't work, use the default category method
		return super.category(element);
	}
}

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