IsNullPredicate (Castor JavaDoc)

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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:

$Revision$ $Date: 2006-04-25 15:08:23 -0600 (Tue, 25 Apr 2006) $

Author:

Ahmad Hassan, Ralf Joachim

Constructor Summary

Constructors
Constructor and Description
`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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`accept(Visitor visitor)` Accept method to handle incoming visitors.
`java.lang.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 java.lang.String toString()
```
    Method constructing query string.
    
    Overrides:
    
    toString in class java.lang.Object
    
    Returns:
    
    Constructed query string.

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