org.hibernate.jpa.criteria.predicate

Enum TruthValue

java.lang.Object

java.lang.Enum<TruthValue>

org.hibernate.jpa.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.

Author:

Steve Ebersole

Enum Constant Summary

Enum Constants

Enum Constant and Description
FALSE
TRUE
UNKNOWN

Method Summary

Modifier and Type	Method and Description
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