Package com.google.javascript.jscomp.base

Enum Class Tri

java.lang.Object

java.lang.Enum<Tri>

com.google.javascript.jscomp.base.Tri

All Implemented Interfaces:

Serializable, Comparable<Tri>, Constable

public enum Tri
extends Enum<Tri>

An enum for ternary logic.

The TRUE and FALSE values are equivalent to typical booleans, and the UNKNOWN value plays the role of a placeholder, which can be either TRUE or FALSE.

A ternary value expression evaluates to TRUE or FALSE only if all replacements of UNKNOWN in this expression yield the same result. Therefore, the ternary logic coincides with typical Boolean logic if the UNKNOWN value is not present in an expression.

See Also:

• Ternary Logic

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
FALSE
TRUE
UNKNOWN

Method Summary

Modifier and Type	Method	Description
Tri	and(Tri x)
static Tri	forBoolean(boolean x)
Tri	not()
Tri	or(Tri x)
boolean	toBoolean(boolean x)
String	toString()
static Tri	valueOf(String name)	Returns the enum constant of this class with the specified name.
static Tri[]	values()	Returns an array containing the constants of this enum class, in the order they are declared.
Tri	xor(Tri x)

Methods inherited from class java.lang.Enum

clone, compareTo, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

FALSE

public static final Tri FALSE

UNKNOWN

public static final Tri UNKNOWN

TRUE

public static final Tri TRUE

Method Details

values

public static Tri[] values()

Returns an array containing the constants of this enum class, in the order they are declared.

Returns:

an array containing the constants of this enum class, in the order they are declared

valueOf

public static Tri valueOf(String name)

Returns the enum constant of this class with the specified name. The string must match exactly an identifier used to declare an enum constant in this class. (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 class has no constant with the specified name

NullPointerException - if the argument is null

or

public Tri or(Tri x)

and

public Tri and(Tri x)

xor

public Tri xor(Tri x)

not

public Tri not()

toBoolean

public boolean toBoolean(boolean x)

forBoolean

public static Tri forBoolean(boolean x)

toString

public String toString()

Overrides:

toString in class Enum<Tri>