Bug 155493 [Deploy] Pictures and chart pictures are lost when preview on Weblogic Server using WAR deploy
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
/**
	 * Get named parameters from http request. parameter names and values are
	 * all in iso-8859-1 format in request.
	 * 
	 * @param request
	 *            incoming http request
	 * @param parameterName
	 *            parameter name
	 * @param isUTF
	 *            is parameter in UTF-8 formator not
	 * @return
	 */
	protected static Set getParameterValues( HttpServletRequest request,
			String parameterName, boolean isUTF )
	{
		HashSet parameterValues = null;
		String ISOParameterName = ( isUTF )
				? toISOString( parameterName )
				: parameterName;
		String[] ISOParameterValues = request
				.getParameterValues( ISOParameterName );
		if ( ISOParameterValues != null )
		{
			parameterValues = new HashSet( );
			for ( int i = 0; i < ISOParameterValues.length; i++ )
			{
				parameterValues.add( toUTFString( ISOParameterValues[i] ) );
			}
		}
		return parameterValues;