org.castor.cpa.persistence.sql.query.condition
Class IsNullPredicate

java.lang.Object
  org.castor.cpa.persistence.sql.query.condition.Condition
      org.castor.cpa.persistence.sql.query.condition.Predicate
          org.castor.cpa.persistence.sql.query.condition.IsNullPredicate

All Implemented Interfaces:

QueryObject

public final class IsNullPredicate
extends Predicate

Predicate that checks expressions for being null or not null.

Version:

$Revision: 8994 $ $Date: 2011-08-02 01:40:59 +0200 (Di, 02 Aug 2011) $

Author:

Ahmad Hassan, Ralf Joachim

Constructor Summary

IsNullPredicate(Expression expression)
Construct a predicate that checks the given expression for being null.

IsNullPredicate(Expression expression, boolean evaluateTo)
Construct a predicate that checks the given expression for being null.

Method Summary

void	accept(Visitor visitor) Accept method to handle incoming visitors.
String	toString() Method constructing query string.

Methods inherited from class org.castor.cpa.persistence.sql.query.condition.Predicate

evaluateTo, expression, not

Methods inherited from class org.castor.cpa.persistence.sql.query.condition.Condition

and, or

Methods inherited from class java.lang.Object

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

Constructor Detail

IsNullPredicate

public IsNullPredicate(Expression expression)

Construct a predicate that checks the given expression for being null.

Parameters:

expression - Expression to check for null.

IsNullPredicate

public IsNullPredicate(Expression expression,
                       boolean evaluateTo)

Construct a predicate that checks the given expression for being null.

Parameters:

expression - Expression to check for null.

evaluateTo - What is the expected result of the evaluation?

Method Detail

accept

public void accept(Visitor visitor)

Accept method to handle incoming visitors.

Parameters:

visitor - Visitor to be handled.

toString

public String toString()

Method constructing query string.

Overrides:

toString in class Object

Returns:

Constructed query string.