Package org.pentaho.reporting.engine.classic.core.states

Class EmptyDataFactory

java.lang.Object

org.pentaho.reporting.engine.classic.core.AbstractDataFactory

org.pentaho.reporting.engine.classic.core.states.EmptyDataFactory

All Implemented Interfaces:

Serializable, Cloneable, DataFactory, DataFactoryDesignTimeSupport, DataFactoryMetaProvider

public class EmptyDataFactory
extends AbstractDataFactory

A datafactory that does not do any real work.

Author:

Thomas Morgner

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.pentaho.reporting.engine.classic.core.AbstractDataFactory

AbstractDataFactory.DataRowWrapper

Field Summary

Fields inherited from interface org.pentaho.reporting.engine.classic.core.DataFactory

QUERY_LIMIT, QUERY_SORT, QUERY_TIMEOUT

Fields inherited from interface org.pentaho.reporting.engine.classic.core.DataFactoryDesignTimeSupport

DESIGN_TIME

Constructor Summary

Constructors

Constructor	Description
EmptyDataFactory()

Method Summary

Modifier and Type	Method	Description
EmptyDataFactory	clone()
void	close()	Closes the data factory and frees all resources held by this instance.
String[]	getQueryNames()	Returns all known query-names.
boolean	isQueryExecutable(String query, DataRow parameters)	Checks whether the query would be executable by this datafactory.
TableModel	queryData(String query, DataRow parameters)	Queries a datasource.

Methods inherited from class org.pentaho.reporting.engine.classic.core.AbstractDataFactory

calculateQueryLimit, calculateQueryTimeOut, cancelRunningQuery, derive, getConfiguration, getContextKey, getDataFactoryContext, getDisplayConnectionName, getLocale, getMetaData, getQueryHash, getReferencedFields, getResourceBundleFactory, getResourceManager, initialize, queryDesignTimeStructure

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyDataFactory

public EmptyDataFactory()

Method Detail

queryData

public TableModel queryData(String query,
                            DataRow parameters)
                     throws ReportDataFactoryException

Queries a datasource. The string 'query' defines the name of the query. The Parameterset given here may contain more data than actually needed for the query.

The parameter-dataset may change between two calls, do not assume anything, and do not hold references to the parameter-dataset or the position of the columns in the dataset.

Parameters:

query - the query string

parameters - the parameters for the query

Returns:

the result of the query as table model.

Throws:

ReportDataFactoryException - if an error occured while performing the query.

close

public void close()

Closes the data factory and frees all resources held by this instance.

isQueryExecutable

public boolean isQueryExecutable(String query,
                                 DataRow parameters)

Checks whether the query would be executable by this datafactory. This performs a rough check, not a full query.

Parameters:

query -

parameters -

Returns:

getQueryNames

public String[] getQueryNames()

Description copied from interface: DataFactory

Returns all known query-names. A data-factory may accept more than the query-names returned here.

Returns:

the known query names.

clone

public EmptyDataFactory clone()

Specified by:

clone in interface DataFactory

Overrides:

clone in class AbstractDataFactory