com.hp.hpl.jena.rdf.query
Class QueryEngine

java.lang.Object
  |
  +--com.hp.hpl.jena.rdf.query.QueryEngine

All Implemented Interfaces:

QueryExecution

public class QueryEngine

extends java.lang.Object

implements QueryExecution

An execution of a query. The query is not modified so can be reused. A new QueryEngine object should be created because the internal state after (and during) execution of a query is not defined. This implementation executes the triple pattern generation on a one thread, executes the constraint filters on another, and leaving the application thread just to return results.

See Also:

Query, QueryResults

Constructor Summary

QueryEngine(Query q)

Method Summary

void	abort() Stop in mid execution.
void	close() Normal end of use of this execution
QueryResults	exec() Do it!
void	init() Initialise a query execution.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryEngine

public QueryEngine(Query q)

Method Detail

init

public void init()

Initialise a query execution. May be called before exec. If it has not be called, the query engine will initialise itself during the exec() method.

Specified by:

init in interface QueryExecution

exec

public QueryResults exec()

Description copied from interface: QueryExecution

Do it!

Specified by:

exec in interface QueryExecution

abort

public void abort()

Description copied from interface: QueryExecution

Stop in mid execution. No guarantee that the concrete implementation actual will stop or that it wil do so immediately.

Specified by:

abort in interface QueryExecution

close

public void close()

Normal end of use of this execution

Specified by:

close in interface QueryExecution