net.sf.jasperreports.engine

Interface JRDataSource

All Known Subinterfaces:

IndexedDataSource, JRRewindableDataSource, JsonData

All Known Implementing Classes:

AbstractPoiXlsDataSource, AbstractXlsDataSource, AbstractXmlDataSource, BookmarksFlatDataSource, ColumnValuesDataSource, DataSourceCollection, ExcelDataSource, JaxenXmlDataSource, JRAbstractBeanDataSource, JRAbstractTextDataSource, JRBeanArrayDataSource, JRBeanCollectionDataSource, JRCsvDataSource, JREmptyDataSource, JRHibernateAbstractDataSource, JRHibernateIterateDataSource, JRHibernateListDataSource, JRHibernateScrollDataSource, JRJpaDataSource, JRMapArrayDataSource, JRMapCollectionDataSource, JRMondrianDataSource, JROlapDataSource, JRResultSetDataSource, JRSortableDataSource, JRTableModelDataSource, JRXlsDataSource, JRXlsxDataSource, JRXmlDataSource, JsonDataCollection, JsonDataSource, ListOfArrayDataSource, Olap4jDataSource, RewindableDataSourceCollection, SortedDataSource, XalanXmlDataSource, XlsDataSource

public interface JRDataSource

This interface represents the abstract representation of a JasperReports data source. All data source types must implement this interface.

Every time a report is filled, an instance of this interface is supplied or created behind the scenes by the reporting engine.

JasperReports provides default implementations of result set, bean collections and bean arrays data sources.

Author:

Teodor Danciu (teodord@users.sourceforge.net)

Method Summary

Methods

Modifier and Type	Method and Description
Object	getFieldValue(JRField jrField) Gets the field value for the current position.
boolean	next() Tries to position the cursor on the next element in the data source.

Method Detail

next

boolean next()
             throws JRException

Tries to position the cursor on the next element in the data source.

Returns:

true if there is a next record, false otherwise

Throws:

JRException - if any error occurs while trying to move to the next element

getFieldValue

Object getFieldValue(JRField jrField)
                     throws JRException

Gets the field value for the current position.

Returns:

an object containing the field value. The object type must be the field object type.

Throws:

JRException