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Jena Prolog query support with examples, and a Jena transaction example.
Added support for Prolog select queries via Jena, including two examples (17 and 18) in AGMoreJenaExamples.java for possible inclusion in the Jena tutorial. Also added a Jena transaction example22 for possible inclusion in the Jena tutorial. Tests added for: no make test-suite run? no make prepush run? yes, in agraph-java-client <release-note> rfe9359: Jena Prolog support. Added support for Prolog select queries over a Jena model. Queries must be written to select for variables that are bound to RDF parts, rather than to arbitrary Lisp objects. </release-note> Signed-off-by: Ahmon Dancy <dancy@franz.com>
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| Original file line number | Diff line number | Diff line change |
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| package test; | ||
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| import java.io.FileInputStream; | ||
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| import tutorial.JenaTutorialExamples; | ||
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| import com.franz.agraph.jena.AGGraph; | ||
| import com.franz.agraph.jena.AGGraphMaker; | ||
| import com.franz.agraph.jena.AGModel; | ||
| import com.franz.agraph.jena.AGQuery; | ||
| import com.franz.agraph.jena.AGQueryExecutionFactory; | ||
| import com.franz.agraph.jena.AGQueryFactory; | ||
| import com.franz.agraph.repository.AGQueryLanguage; | ||
| import com.franz.agraph.repository.AGRepositoryConnection; | ||
| import com.hp.hpl.jena.query.QueryExecution; | ||
| import com.hp.hpl.jena.query.QuerySolution; | ||
| import com.hp.hpl.jena.query.ResultSet; | ||
| import com.hp.hpl.jena.rdf.model.Literal; | ||
| import com.hp.hpl.jena.rdf.model.RDFNode; | ||
| import com.hp.hpl.jena.rdf.model.StmtIterator; | ||
| import com.hp.hpl.jena.vocabulary.RDF; | ||
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| public class AGMoreJenaExamples extends JenaTutorialExamples { | ||
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| public static void exampleBulkUpdate() throws Exception { | ||
| AGGraphMaker maker = example6(); | ||
| AGModel model = new AGModel(maker.getGraph()); | ||
| AGModel model2 = new AGModel(maker.createGraph("http://example.org/foo")); | ||
| StmtIterator statements = model.listStatements(null,RDF.type, (RDFNode)null); | ||
| model2.add(statements); | ||
| System.out.println("Size: "+model2.size()); | ||
| model2.write(System.out); | ||
| statements = model.listStatements(null,RDF.type, (RDFNode)null); | ||
| model2.remove(statements); | ||
| System.out.println("Size: "+model2.size()); | ||
| model2.write(System.out); | ||
| } | ||
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| /** | ||
| * Prolog queries | ||
| */ | ||
| public static void example17() throws Exception { | ||
| AGGraphMaker maker = example6(); | ||
| AGGraph graph = maker.getGraph(); | ||
| AGModel model = new AGModel(graph); | ||
| try { | ||
| model.setNsPrefix("kdy", "http://www.franz.com/simple#"); | ||
| String rules1 = | ||
| "(<-- (woman ?person) ;; IF\n" + | ||
| " (q ?person !kdy:sex !kdy:female)\n" + | ||
| " (q ?person !rdf:type !kdy:person))\n" + | ||
| "(<-- (man ?person) ;; IF\n" + | ||
| " (q ?person !kdy:sex !kdy:male)\n" + | ||
| " (q ?person !rdf:type !kdy:person))"; | ||
| maker.getRepositoryConnection().addRules(rules1); | ||
| println("\nFirst and Last names of all \"men.\""); | ||
| String queryString = | ||
| "(select (?first ?last)\n" + | ||
| " (man ?person)\n" + | ||
| " (q ?person !kdy:first-name ?first)\n" + | ||
| " (q ?person !kdy:last-name ?last))"; | ||
| AGQuery prolog = AGQueryFactory.create(AGQueryLanguage.PROLOG,queryString); | ||
| QueryExecution qe = AGQueryExecutionFactory.create(prolog, model); | ||
| try { | ||
| ResultSet results = qe.execSelect(); | ||
| while (results.hasNext()) { | ||
| QuerySolution result = results.next(); | ||
| RDFNode f = result.get("first"); | ||
| RDFNode l = result.get("last"); | ||
| System.out.println(f + " " + l); | ||
| } | ||
| } finally { | ||
| qe.close(); | ||
| } | ||
| } finally { | ||
| model.close(); | ||
| } | ||
| } | ||
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| /** | ||
| * Loading Prolog rules | ||
| */ | ||
| public static void example18() throws Exception { | ||
| AGGraphMaker maker = example6(); | ||
| AGGraph graph = maker.createGraph("http://example18.org"); | ||
| AGModel model = new AGModel(graph); | ||
| try { | ||
| model.setNsPrefix("kdy", "http://www.franz.com/simple#"); | ||
| model.setNsPrefix("rltv", "http://www.franz.com/simple#"); | ||
| String path = "src/tutorial/java-rules.txt"; | ||
| maker.getRepositoryConnection().addRules(new FileInputStream(path)); | ||
| String queryString = | ||
| "(select (?person ?uncle) " + | ||
| "(uncle ?y ?x)" + | ||
| "(name ?x ?person)" + | ||
| "(name ?y ?uncle))"; | ||
| AGQuery prolog = AGQueryFactory.create(AGQueryLanguage.PROLOG,queryString); | ||
| QueryExecution qe = AGQueryExecutionFactory.create(prolog, model); | ||
| try { | ||
| ResultSet results = qe.execSelect(); | ||
| while (results.hasNext()) { | ||
| QuerySolution result = results.next(); | ||
| RDFNode p = result.get("person"); | ||
| RDFNode u = result.get("uncle"); | ||
| println(u + " is the uncle of " + p); | ||
| } | ||
| } finally { | ||
| qe.close(); | ||
| } | ||
| } finally { | ||
| model.close(); | ||
| } | ||
| } | ||
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| /** | ||
| * Transactions | ||
| */ | ||
| public static void example22() throws Exception { | ||
| AGGraphMaker maker1 = example1(false); | ||
| // Get another graph maker for the repository on a another connection | ||
| AGRepositoryConnection conn2 = maker1.getRepositoryConnection().getRepository().getConnection(); | ||
| closeBeforeExit(conn2); | ||
| AGGraphMaker maker2 = new AGGraphMaker(conn2); | ||
| AGModel model1 = new AGModel(maker1.getGraph()); | ||
| AGModel model2 = new AGModel(maker2.getGraph()); | ||
| model2.begin(); | ||
| String baseURI = "http://example.org/example/local"; | ||
| model1.read(new FileInputStream("src/tutorial/java-lesmis.rdf"), baseURI); | ||
| println("Loaded " + model1.size() + " java-lesmis.rdf triples via conn1."); | ||
| model2.read(new FileInputStream("src/tutorial/java-kennedy.ntriples"), baseURI, "N-TRIPLE"); | ||
| println("Loaded " + model2.size() + " java-kennedy.ntriples via conn2."); | ||
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| println("\nSince model1 is not in a transaction, java-lesmis.rdf triples are committed " + | ||
| "and retrievable via model2. Since model2 is in a transaction, and " + | ||
| "no commit() has yet been issued on model2, kennedy.rdf triples are not " + | ||
| " retrievable via model1."); | ||
| // Check transaction isolation semantics: | ||
| Literal valjean = model1.createLiteral("Valjean"); | ||
| Literal kennedy = model1.createLiteral("Kennedy"); | ||
| printRows("\nUsing listStatements() on model1; should find Valjean:", | ||
| 1, model1.listStatements(null, null, valjean)); | ||
| printRows("\nUsing listStatements() on model1; should not find Kennedy:", | ||
| 1, model1.listStatements(null, null, kennedy)); | ||
| printRows("\nUsing listStatements() on model2; should not find Valjean (until a rollback or commit occurs on model2):", | ||
| 1, model2.listStatements(null, null, valjean)); | ||
| printRows("\nUsing listStatements() on model2; should find Kennedy:", | ||
| 1, model2.listStatements(null, null, kennedy)); | ||
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| // Rollback | ||
| println("\nRolling back contents of model2."); | ||
| model2.abort(); | ||
| println("There are now " + model2.size() + " triples visible via model2."); | ||
| printRows("\nUsing listStatements() on model1; should find Valjean:", | ||
| 1, model1.listStatements(null, null, valjean)); | ||
| printRows("\nUsing listStatements() on model1; should not find Kennedys:", | ||
| 1, model1.listStatements(null, null, kennedy)); | ||
| printRows("\nUsing listStatements() on model2; should not find Kennedys:", | ||
| 1, model2.listStatements(null, null, kennedy)); | ||
| printRows("\nUsing listStatements() on model2; should find Valjean:", | ||
| 1, model2.listStatements(null, null, valjean)); | ||
| // Reload and Commit | ||
| println("\nReload java-kennedy.ntriples into model2."); | ||
| model2.begin(); | ||
| model2.read(new FileInputStream("src/tutorial/java-kennedy.ntriples"), baseURI, "N-TRIPLE"); | ||
| println("There are now " + model1.size() + " triples visible on model1."); | ||
| println("There are now " + model2.size() + " triples visible on model2."); | ||
| println("\nCommitting contents of model2."); | ||
| model2.commit(); | ||
| println("There are now " + model1.size() + " triples visible on model1."); | ||
| println("There are now " + model2.size() + " triples visible on model2."); | ||
| printRows("\nUsing listStatements() on model1; should find Valjean:", | ||
| 1, model1.listStatements(null, null, valjean)); | ||
| printRows("\nUsing listStatements() on model1; should find Kennedys:", | ||
| 1, model1.listStatements(null, null, kennedy)); | ||
| printRows("\nUsing listStatements() on model2; should find Kennedys:", | ||
| 1, model2.listStatements(null, null, kennedy)); | ||
| printRows("\nUsing listStatements() on model2; should find Valjean:", | ||
| 1, model2.listStatements(null, null, valjean)); | ||
| maker1.close(); | ||
| maker2.close(); | ||
| } | ||
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| public static void main(String[] args) throws Exception { | ||
| example17(); | ||
| example18(); | ||
| example22(); | ||
| exampleBulkUpdate(); | ||
| closeAll(); | ||
| } | ||
| } |
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