net.sf.jasperreports.engine

Class JREmptyDataSource

java.lang.Object

net.sf.jasperreports.engine.JREmptyDataSource

All Implemented Interfaces:

JRDataSource, JRRewindableDataSource

public class JREmptyDataSource
extends Object
implements JRRewindableDataSource

A simple data source implementation that simulates a data source with a given number of virtual records inside. It is called empty data source because even though it has one or more records inside, all the report fields are null for all the virtual records of the data source.

The simplest implementation of the JRDataSource interface, this class can be used in reports that do not display data from the supplied data source, but rather from parameters, and when only the number of virtual rows in the data source is important.

Author:

Teodor Danciu (teodord@users.sourceforge.net)

See Also:

JRDataSource

Constructor Summary

Constructors

Constructor and Description
JREmptyDataSource()
JREmptyDataSource(int count)

Method Summary

Methods

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

Methods inherited from class java.lang.Object

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

Constructor Detail

JREmptyDataSource

public JREmptyDataSource()

JREmptyDataSource

public JREmptyDataSource(int count)

Method Detail

next

public boolean next()

Description copied from interface: JRDataSource

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

Specified by:

next in interface JRDataSource

Returns:

true if there is a next record, false otherwise

getFieldValue

public Object getFieldValue(JRField field)

Description copied from interface: JRDataSource

Gets the field value for the current position.

Specified by:

getFieldValue in interface JRDataSource

Returns:

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

moveFirst

public void moveFirst()

Description copied from interface: JRRewindableDataSource

Moves back to the first element in the data source.

Specified by:

moveFirst in interface JRRewindableDataSource