question: static PathPart makeAbsolute ( PathPart oldPart ) { @ SuppressWarnings ( "StringEquality" ) boolean encodedCached = oldPart . encoded != NOT_CACHED ; String oldPath = encodedCached ? oldPart . encoded : oldPart . decoded ; if ( oldPath == null || oldPath . length ( ) == 0 || oldPath . startsWith ( "/" ) ) { return oldPart ; } String newEncoded = encodedCached ? "/" + oldPart . encoded : NOT_CACHED ; @ SuppressWarnings ( "StringEquality" ) boolean decodedCached = oldPart . decoded != NOT_CACHED ; String newDecoded = decodedCached ? "/" + oldPart . decoded : NOT_CACHED ; return new PathPart ( newEncoded , newDecoded ) ; }
target:  Prepends path values with "/" if they're present, not empty, and they don't already start with "/".