org.hibernate.ejb.criteria.predicate
Enum TruthValue

java.lang.Object
  extended by java.lang.Enum<TruthValue>
      extended by org.hibernate.ejb.criteria.predicate.TruthValue
All Implemented Interfaces:
Serializable, Comparable<TruthValue>

public enum TruthValue
extends Enum<TruthValue>

Models what ANSI-SQL terms a truth value. Specifically, ANSI-SQL defines TRUE, FALSE and UNKNOWN as truth values. These truth values are used to explicitly check the result of a boolean expression (the syntax is like a > b IS TRUE. IS TRUE is the assumed default.

JPA defines support for only IS TRUE and IS FALSE, not IS UNKNOWN (a > NULL is an example where the result would be UNKNOWN). All 3 are provided here for completness.


Enum Constant Summary
FALSE
           
TRUE
           
UNKNOWN
           
 
Method Summary
static TruthValue valueOf(String name)
          Returns the enum constant of this type with the specified name.
static TruthValue[] values()
          Returns an array containing the constants of this enum type, in the order they are declared.
 
Methods inherited from class java.lang.Enum
clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Enum Constant Detail

TRUE

public static final TruthValue TRUE

FALSE

public static final TruthValue FALSE

UNKNOWN

public static final TruthValue UNKNOWN
Method Detail

values

public static TruthValue[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:
for (TruthValue c : TruthValue.values())
    System.out.println(c);

Returns:
an array containing the constants of this enum type, in the order they are declared

valueOf

public static TruthValue valueOf(String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:
name - the name of the enum constant to be returned.
Returns:
the enum constant with the specified name
Throws:
IllegalArgumentException - if this enum type has no constant with the specified name
NullPointerException - if the argument is null


Copyright © 2001-2012 Red Hat, Inc. All Rights Reserved.