com.jrefinery.report.filter
Class EmptyDataSource

java.lang.Object
  com.jrefinery.report.filter.EmptyDataSource

All Implemented Interfaces:

java.lang.Cloneable, DataSource, java.io.Serializable

public final class EmptyDataSource

extends java.lang.Object

implements DataSource

A data source that always returns null.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

EmptyDataSource()

Method Summary

java.lang.Object	clone() Clones the data source.
java.lang.Object	getValue() Returns the value for the data source (always null in this case).

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyDataSource

public EmptyDataSource()

Method Detail

getValue

public java.lang.Object getValue()

Returns the value for the data source (always null in this case).

Specified by:

getValue in interface DataSource

Returns:

always null.

clone

public java.lang.Object clone()
                       throws java.lang.CloneNotSupportedException

Clones the data source.

Specified by:

clone in interface DataSource

Returns:

a clone.

Throws:

java.lang.CloneNotSupportedException - this should never happen.