com.hp.hpl.jena.rdql
Class QueryEngineExt

java.lang.Object
  com.hp.hpl.jena.rdql.QueryEngineExt

All Implemented Interfaces:

QueryExecution

public class QueryEngineExt

extends java.lang.Object

implements QueryExecution

An execution of a query. This is mapping to the old, external query evaluation system. 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.

Version:

$Id: QueryEngineExt.java,v 1.3 2003/06/19 16:09:50 andy_seaborne Exp $

Author:

Andy Seaborne

See Also:

Query, QueryResults

Constructor Summary

QueryEngineExt(Query q)
Deprecated. Use QueryEngine - which devloves mathcing to the graph.

Method Summary

void	abort() Stop in mid execution.
void	close() Normal end of use of this execution
QueryResults	exec() Execute a query and get back the results.
QueryResults	exec(ResultBinding startBinding) Execute a query, passing in an initial binding of some of the variables in the query.
void	init() Initialise a query execution.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryEngineExt

public QueryEngineExt(Query q)

Deprecated. Use QueryEngine - which devloves mathcing to the graph.

Parameters:

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()

Execute a query and get back the results.

Specified by:

exec in interface QueryExecution

Returns:

QueryResults

exec

public QueryResults exec(ResultBinding startBinding)

Execute a query, passing in an initial binding of some of the variables in the query.

Specified by:

exec in interface QueryExecution

Parameters:

startBinding - Initial values of variables.

Returns:

QueryResults

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 will 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