Package 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:

  • Constructor Details

    • JREmptyDataSource

      public JREmptyDataSource()

    • JREmptyDataSource

      public JREmptyDataSource(int count)

  • Method Details

    • 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