Resolve the url in the context of context.
Parameters: context - The URL of the ressource containing the reference url Parameters: url - a relative or absolution url string throws: MalformedURLException -
Relsovle file or url path relatively to a context. file is considered first.
If file is not defined, url will be considered.
Parameters: context - The URL of the ressource containing the reference file or url Parameters: file - a relative or absolute path Parameters: url - a relative or absolution url string the resulting url or null if faile and url are null. throws: MalformedURLException -