org.apache.hadoop.fs.s3a

Enum Tristate

java.lang.Object

java.lang.Enum<Tristate>

org.apache.hadoop.fs.s3a.Tristate

All Implemented Interfaces:

Serializable, Comparable<Tristate>

public enum Tristate
extends Enum<Tristate>

Simple enum to express {true, false, don't know}.

Enum Constant Summary

Enum Constants

Enum Constant and Description
FALSE
TRUE
UNKNOWN

Method Summary

Modifier and Type	Method and Description
static Tristate	from(Optional<Boolean> b) Build a tristate from a boolean.
static Tristate	fromBool(boolean v)
Optional<Boolean>	getMapping() Get the boolean mapping, if present.
boolean	isBoolean() Does this value map to a boolean.
static Tristate	valueOf(String name) Returns the enum constant of this type with the specified name.
static Tristate[]	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 Tristate TRUE

FALSE

public static final Tristate FALSE

UNKNOWN

public static final Tristate UNKNOWN

Method Detail

values

public static Tristate[] 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 (Tristate c : Tristate.values())
    System.out.println(c);

Returns:

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

valueOf

public static Tristate 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

getMapping

public Optional<Boolean> getMapping()

Get the boolean mapping, if present.

Returns:

the boolean value, if present.

isBoolean

public boolean isBoolean()

Does this value map to a boolean.

Returns:

true if the state is one of true or false.

fromBool

public static Tristate fromBool(boolean v)

from

public static Tristate from(Optional<Boolean> b)

Build a tristate from a boolean.

Parameters:

b - source optional

Returns:

a tristate derived from the argument.