eworks.eRQL.engine
Class eRqlEngine

java.lang.Object
  eworks.eRQL.engine.eRqlEngine

public class eRqlEngine

extends Object

eRqlEngine is a prototype implementation of an eRQL processor - a new query language for RDF. Details on eRQL can be obtained at http://www.dbis.informatik.uni-frankfurt.de/~tolle/RDF/eRQL/ and http://www.wleklinski.de/rdf/. Details on RDF are available at http://www.w3.org/RDF/.

eRqlEngine eRQL = new eRqlEngine();
eworks.RDF.model.Tuples result = null;
try {
    result=eRQL.query(new java.io.File("C:\input.rdf"),"~~ Pablo Picasso");
} catch(Exception e) {
    System.out.println(e);
}

Version:

1.00 (2003-11-03)

Author:

Fabian Wleklinski (fabian@wleklinski.de)

Constructor Summary

eRqlEngine()
Constructs an eRqlEngine-instance.

eRqlEngine(OutputStream output)
Constructs an eRqlEngine-instance and sets the output-stream for printing error- and debug-messages.

Method Summary

Tuples

query(File rdfFile, String queryString) Evaluates the eRQL query queryString.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

eRqlEngine

public eRqlEngine(OutputStream output)

Constructs an eRqlEngine-instance and sets the output-stream for printing error- and debug-messages.

Parameters:

output - Output-stream for printing error- and debug-messages.

eRqlEngine

public eRqlEngine()

Constructs an eRqlEngine-instance.

Method Detail

query

public Tuples query(File rdfFile,
                    String queryString)
             throws Exception

Evaluates the eRQL query queryString.

Parameters:

rdfFile - The RDF file to query.

queryString - The query string to query.

Returns:

The tuples that match the query.

Throws:

Exception