org.jfree.report.expressions.sys
Class IsNullExpression

java.lang.Object
  extended by org.jfree.report.expressions.AbstractExpression
      extended by 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