Jena 1.6.1 Location Modification Home | About DAML | Announcements | Roadmap | Site Search

Summary

This is a modification of the Jena 1.6.1 API that captures location information during parsing. Because the changes required modifications to the source code this modification replaces jena.jar

Details

As the RDF parser (ARP) parses an RDF, DAML, or OWL file, it generates a set of statements that are stored in a Jena Model. During this process a Location object is created that contains the source, line number, and column number for each statement. I have added the method getLocation() to Statement to provide access to the location information. A new add method has been added to ModelCon that takes a Location.

The modified source files are available for download below. The zip file contains just the modified files. I have preserved the directory structure in case you want to patch the Jena 1.6.1 src directory via the unzipping process.

Download

• Zip file of jar and documentation.
• Zip file of the modified source files.

Code Changes

Modifications to ARP/Jena toolkit to add location information (line, column, source file) from ARP to RDF Statements in Jena.

• Reuses the Location class from ARP (modified to make public and have accessor functions) and stores it directly in the Statement.
• The TokenPipe was modified to keep track of the last Token, allowing access to the Token's location info from the ARPResource class via the ARPFilter.
• StatementHandler was extended to take the location object produced by ARP. ARP will not pass the location information to an original StatementHandler, allowing backwards compatability.
• Jena's Statement class was modified to store the Location instance. This is set/get using a new method (rather than defining a new constructor) to reduce code changes.
• ModelCon.add(s,p,o,location) was also added.

Resources

• This work extends the Jena API
• I have a similar Jena extension that is better for working with and writing statements organized source (no line numbers support) and also supports dynamic loading of namespaces as they are referenced.

Author