TriState (Graal OpenJDK Project Documentation)

java.lang.Object
- java.lang.Enum<TriState>
- - jdk.internal.jvmci.meta.TriState

All Implemented Interfaces:

Serializable, Comparable<TriState>
```
public enum TriState
extends Enum<TriState>
```
Represents a logic value that can be either TRUE, FALSE, or UNKNOWN.

Enum Constant Summary

Enum Constants
Enum Constant and Description

FALSE

TRUE

UNKNOWN

Enum Constants
Enum Constant and Description
`FALSE`
`TRUE`
`UNKNOWN`

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`static TriState`	`get(boolean value)`
`boolean`	`isFalse()`
`boolean`	`isKnown()`
`boolean`	`isTrue()`
`boolean`	`isUnknown()`
`static TriState`	`merge(TriState a, TriState b)` This is optimistic about `UNKNOWN` (it prefers known values over `UNKNOWN`) and pesimistic about known (it perfers `TRUE` over `FALSE`).
`boolean`	`toBoolean()`
`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
  - get
```
public static TriState get(boolean value)
```
  - merge
```
public static TriState merge(TriState a,
                             TriState b)
```
    This is optimistic about UNKNOWN (it prefers known values over UNKNOWN) and pesimistic about known (it perfers TRUE over FALSE).
  - isTrue
```
public boolean isTrue()
```
  - isFalse
```
public boolean isFalse()
```
  - isUnknown
```
public boolean isUnknown()
```
  - isKnown
```
public boolean isKnown()
```
  - toBoolean
```
public boolean toBoolean()
```

Enum TriState

Enum Constant Summary

Method Summary

Methods inherited from class java.lang.Enum

Methods inherited from class java.lang.Object

Enum Constant Detail

TRUE

FALSE

UNKNOWN

Method Detail

values

valueOf

get

merge

isTrue

isFalse

isUnknown

isKnown

toBoolean