org.hibernate.ejb.criteria.predicate
Enum TruthValue
java.lang.Object
java.lang.Enum<TruthValue>
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.
- Author:
- Steve Ebersole
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. |
TRUE
public static final TruthValue TRUE
FALSE
public static final TruthValue FALSE
UNKNOWN
public static final TruthValue UNKNOWN
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
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