Gem wrapper for Apache Jena

This Gem provides convenience access to the Apache Jena RDF platform. Jena is a widely used Java platform for parsing, storing, manipulating, querying and publishing semantic web data and linked data. This gem provides a single dependency so that JRuby programs can access all of the capabilities of Jena, including TDB, conveniently from JRuby.

This gem provides the following benefits:

a single dependency which includes all of the .jar files for the latest release of Jena (currently 2.13.0) including TDB.
import of some of the key classes used by Jena-based programs into a Jena:: module, to make code more compact
some additional utility and convenience methods

Using the gem

Once installed, just add to your code:

require 'jena_jruby'

or add a suitable dependency to your bundle spec.

Access to Jena from Java

Create a model:

m = Jena::Core::ModelFactory.create_default_model

(note that JRuby automagically converts Java CamelCase names to Ruby lower_case names)

Add a statement:

jruby-1.6.5 :003 > m = Jena::Core::ModelFactory.create_default_model
 => #<Java::ComHpHplJenaRdfModelImpl::ModelCom:0x135a4815>
jruby-1.6.5 :004 > s = Jena::Core::ResourceFactory.create_resource "http://example.org/s"
 => #<Java::ComHpHplJenaRdfModelImpl::ResourceImpl:0x7b0f62cb>
jruby-1.6.5 :005 > o = Jena::Core::ResourceFactory.create_resource "http://example.org/o"
 => #<Java::ComHpHplJenaRdfModelImpl::ResourceImpl:0x4879c985>
jruby-1.6.5 :006 > p = Jena::Core::ResourceFactory.createProperty "http://example.org/p"
 => #<Java::ComHpHplJenaRdfModelImpl::PropertyImpl:0x3f7cd159>
jruby-1.6.5 :007 > m.add s,p,o
 => #<Java::ComHpHplJenaRdfModelImpl::ModelCom:0x135a4815>
jruby-1.6.5 :009 > m.toString
 => "<ModelCom   {http://example.org/s @http://example.org/p http://example.org/o} | >"

Building and installing the gem

Since jena now includes TDB modules, those modules no longer need to be built locally.

To build the gem itself:

$ rake build
jena-jruby 0.7.0 built to pkg/jena-jruby-0.7.0-java.gem.

$ gem build jena-jruby.gemspec
Successfully built RubyGem
Name: jena-jruby
Version: 0.7.0
File: jena-jruby-0.7.0-java.gem

To run the tests:

$ bundle exec rake test
Run options: --seed 45483

# Running:

................

Finished in 0.351000s, 45.5840 runs/s, 142.4501 assertions/s.

16 runs, 50 assertions, 0 failures, 0 errors, 0 skips

chalkos/jena-jruby

Gem wrapper for Apache Jena

Using the gem

Access to Jena from Java

Building and installing the gem