JREmptyDataSource (JasperReports Javadoc 7.0.1 API)

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 Description

JREmptyDataSource()

JREmptyDataSource(int count)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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