org.jfree.report.expressions.sys
Class IsNullExpression

java.lang.Object
  org.jfree.report.expressions.AbstractExpression
      org.jfree.report.expressions.sys.IsNullExpression

All Implemented Interfaces:

java.io.Serializable, java.lang.Cloneable, Expression

public class IsNullExpression
extends AbstractExpression

Creation-Date: 27.01.2006, 20:42:19

Author:

Thomas Morgner

See Also:

Serialized Form

Constructor Summary

IsNullExpression()

Method Summary

java.lang.Object	computeValue() Return the current expression value.
java.lang.Object	getValue()
void	setValue(java.lang.Object value)

Methods inherited from class org.jfree.report.expressions.AbstractExpression

clone, getDataRow, getInstance, getName, getParentLocale, getReportConfiguration, getResourceBundleFactory, getRuntime, isDeepTraversing, isPrecompute, isPreserve, setDeepTraversing, setName, setPrecompute, setPreserve, setRuntime

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullExpression

public IsNullExpression()

Method Detail

getValue

public java.lang.Object getValue()

setValue

public void setValue(java.lang.Object value)

computeValue

public java.lang.Object computeValue()
                              throws DataSourceException

Return the current expression value.

The value depends (obviously) on the expression implementation.

Returns:

the value of the function.

Throws:

DataSourceException