net.sf.jasperreports.engine.query
Class JREmptyQueryExecuter

java.lang.Object
  net.sf.jasperreports.engine.query.JREmptyQueryExecuter

All Implemented Interfaces:

JRQueryExecuter

public class JREmptyQueryExecuter
extends Object
implements JRQueryExecuter

Version:

$Id: JREmptyQueryExecuter.java 4595 2011-09-08 15:55:10Z teodord $

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

Constructor Summary

JREmptyQueryExecuter()

Method Summary

boolean	cancelQuery() Cancels the query if it's currently running.
void	close() Closes resources kept open during the data source iteration.
JRDataSource	createDatasource() Executes the query and creates a JRDataSource out of the result.

Methods inherited from class java.lang.Object

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

Constructor Detail

JREmptyQueryExecuter

public JREmptyQueryExecuter()

Method Detail

cancelQuery

public boolean cancelQuery()
                    throws JRException

Description copied from interface: JRQueryExecuter

Cancels the query if it's currently running.

This method will be called from a different thread if the client decides to cancel the filling process.

Specified by:

cancelQuery in interface JRQueryExecuter

Returns:

true if and only if the query was running and it has been canceled

Throws:

JRException

close

public void close()

Description copied from interface: JRQueryExecuter

Closes resources kept open during the data source iteration.

This method is called after the report is filled or the dataset is iterated. If a resource is not needed after the data source has been created, it should be released at the end of createDatasource.

Specified by:

close in interface JRQueryExecuter

createDatasource

public JRDataSource createDatasource()
                              throws JRException

Description copied from interface: JRQueryExecuter

Executes the query and creates a JRDataSource out of the result.

Specified by:

createDatasource in interface JRQueryExecuter

Returns:

a JRDataSource wrapping the query execution result.

Throws:

JRException