These routines calculate the difference between two RDFConnections and provides a mechanism to create an UpdateRequest to cause them to be isomorphic.
These routines should not be confused with the RDF-Patch file format.
The PatchFactory is used to create a patch from various types of RDF stores. It creates an order list of Quads for both arguments and then performs a diff to determine which quads need to be inserted or deleted. This is returned a a Patch<Quad> object.
The UpdateFactory is used to convert the Patch<Quad> object into an UpdateRequest that can be passed to an RDFConnection to perform the update to make the contained graphs isomorphic.
The following code snippet creates two RDFConnections an (original and a changed), finds the differences between them and updates the original to match the changed.
RDFConnection origC = RDFConnectionFactory.connect( ... );
RDFConnection chgdC = RDFConnectionFactory.connect( ... );
Patch<Quad> patch = PatchFactory.patch( origC, chgdC );
UpdateRequest req = UpdateFactory.asUpdate( patch );
origC.update( req );