Package org.pentaho.reporting.engine.classic.core.filter

Class EmptyDataSource

java.lang.Object

org.pentaho.reporting.engine.classic.core.filter.EmptyDataSource

All Implemented Interfaces:

Serializable, Cloneable, DataSource

public final class EmptyDataSource
extends Object
implements DataSource

A data source that always returns null.

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
EmptyDataSource()	Default-Constructor.

Method Summary

Modifier and Type	Method	Description
EmptyDataSource	clone()	Clones the data source.
Object	getValue(ExpressionRuntime runtime, ReportElement element)	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()

Default-Constructor.

Method Detail

getValue

public Object getValue(ExpressionRuntime runtime,
                       ReportElement element)

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

Specified by:

getValue in interface DataSource

Parameters:

runtime - the expression runtime that is used to evaluate formulas and expressions when computing the value of this filter.

element -

Returns:

always null.

clone

public EmptyDataSource clone()

Clones the data source.

Specified by:

clone in interface DataSource

Overrides:

clone in class Object

Returns:

a clone.