/*

* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package com.nokia.s60tools.crashanalyser.model;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.jface.viewers.ViewerSorter;

import com.nokia.s60tools.crashanalyser.containers.ErrorLibraryError;

/**

 * Sorts errors correctly in ErrorDialog's errors list 

 *

 * E.g.

 * 

 * -1

 * -2

 * -3

 * KErrBadHandle

 * KErrNone

 * KErrNotFound

 *

 */

public class ErrorsViewerSorter extends ViewerSorter {

	@Override

	public int compare(Viewer viewer, Object e1, Object e2) {

		String errorName1 = ((ErrorLibraryError)e1).toString().trim();

		String errorName2 = ((ErrorLibraryError)e2).toString().trim();

		// both are numbers

		if (isParsableToInt(errorName1) && isParsableToInt(errorName2)) {

			int error1 = Integer.parseInt(errorName1);

			int error2 = Integer.parseInt(errorName2);

			if (error1 > error2)

				return -1;

			else if (error1 < error2)

				return 1;

			else

				return 0;

		// errorName1 is number, errorName2 is not

		} else if (isParsableToInt(errorName1)) {

			return -1;

		// errorName1 is not a number, errorName2 is a number

		} else if (isParsableToInt(errorName2)) {

			return 1;

		// errorName1 nor errorName2 is a number

		} else {

			return errorName1.compareTo(errorName2);

		}

	}

	/**

	 * Checks whether given string is a number

	 * @param i string

	 * @return true if given string is a number, false if not

	 */

	boolean isParsableToInt(String i)

	{

		try

		{

			Integer.parseInt(i);

			return true;

		}

		catch(Exception e)

		{

			return false;

		}

	}	

}