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

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

Direct Known Subclasses:

IsNullPredicate

public abstract class Predicate
extends Condition

Abstract base class for all predicates.

Version:

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

Author:

Ahmad Hassan, Ralf Joachim

Constructor Summary

protected

Predicate(Expression expression, boolean evaluateTo) Construct a predicate with given expression.

Method Summary

boolean	evaluateTo() Returns if the predicate should evaluate to true or false.
Expression	expression() Expression to apply the predicate to.
Condition	not() Builder method to invert a condition.

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

and, or

Methods inherited from class org.castor.cpa.persistence.sql.query.QueryObject

toString, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Predicate

protected Predicate(Expression expression,
                    boolean evaluateTo)

Construct a predicate with given expression.

Parameters:

expression - Expression to apply the predicate to.

evaluateTo - What is the expected result of the evaluation?

Method Detail

expression

public final Expression expression()

Expression to apply the predicate to.

Returns:

Expression to apply the predicate to.

evaluateTo

public final boolean evaluateTo()

Returns if the predicate should evaluate to true or false.

Returns:

true if the predicate should evaluate to true, false otherwise.

not

public final Condition not()

Description copied from class: Condition

Builder method to invert a condition. A condition that evaluated to TRUE before calling this method will evaluate to FALSE thereafter.

Specified by:

not in class Condition

Returns:

Negated condition.