/**
* Construct a Filter object. This filter object may be used to match a ServiceReference or a
* Dictionary. See Filter for a description of the filter string syntax.
*
* @param filter The filter string.
* @return A Filter object encapsulating the filter string.
* @exception InvalidSyntaxException If the filter parameter contains an invalid filter string
* which cannot be parsed.
*/
public Filter createFilter(String filter) throws InvalidSyntaxException {
checkValid();
return FilterImpl.newInstance(filter);
}