Bug 214204 Only document content in document folder should be removed.[0601]
Description: Only document related content in document folder should be removed. Build number:2.3.0.v20080103 Steps to reproduce: 1. Deploy BIRT. 2. Edit web.xml to set BIRT_VIEWER_DOCUMENT_FOLDER to your local path and there are content inside the path. 3. Start server and click View Example to preview sample report. Expected result: Only content created by viewer should be removed in specified document folder. Actual result: All contents are deleted despite whether they are related with BIRT. Error log:n/a
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
* 
	 * @param s
	 *            string to be encoded.
	 * @param format
	 *            encoding format.
	 * @return
	 */
	public static String urlEncode( String s, String format )
	{
		String encodedString = s;
		if ( s != null )
		{
			try
			{
				encodedString = URLEncoder.encode( s, format );
			}
			catch ( UnsupportedEncodingException e )
			{
				encodedString = s;
			}
		}
		return encodedString;
	}
	/**
	 * Parse config file name from report design filename.
	 * 
	 * @param reportDesignName
	 *            String
	 * @return String
	 */