Enum Variance

java.lang.Object

java.lang.Enum<Variance>

gw.lang.parser.expressions.Variance

All Implemented Interfaces:

Serializable, Comparable<Variance>, java.lang.constant.Constable

public enum Variance
extends Enum<Variance>

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	Variance.DefaultVarianceVerifier
static interface	Variance.IVarianceVerifier
private static class	Variance.VarianceInvalidException

Nested classes/interfaces inherited from class Enum

Enum.EnumDesc<E>

Enum Constant Summary

Enum Constants

Enum Constant	Description
CONTRAVARIANT
COVARIANT
DEFAULT
INVARIANT
PENDING	internal use: variance inference
WILD_CONTRAVARIANT	internal use: Java interop
WILD_COVARIANT	internal use: Java interop

Field Summary

Fields

Modifier and Type	Field	Description
private final String	_desc
private final char	_sign
private static final TypeSystemAwareCache<IType, Map<String,Variance>>	DEFAULT_VARIANCE_MAP
private static final boolean	SUPPORT_DEFAULT_VARIANCE_CHECKING

Constructor Summary

Constructors

Modifier	Constructor	Description
private	Variance(String desc, char sign)

Method Summary

Modifier and Type	Method	Description
String	getDesc()
char	getSymbol()
private static Variance	getVariance(ITypeVariableType type)
private static void	inferVariance(IType genericType, Map<String,Variance> map)
private static Variance	invertVariance(Variance variance)
private static boolean	isTypeVarFromEnclosingType(IType enclosingType, ITypeVariableType typeVar)
static Variance	maybeInferVariance(IType type, IGenericTypeVariable gtv)
static Variance	valueOf(String name)	Returns the enum constant of this type with the specified name.
static Variance[]	values()	Returns an array containing the constants of this enum type, in the order they are declared.
private static boolean	verifyDefaultForVariance(IType type)
static void	verifyDefaultTypeVarVariance(IType enclosingType, Variance ctxVariance, IType... types)
static void	verifyTypeVarVariance(Variance variance, IType enclosingType, Variance.IVarianceVerifier verifier, IType type)

Methods inherited from class Enum

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

Methods inherited from class Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

COVARIANT

public static final Variance COVARIANT

CONTRAVARIANT

public static final Variance CONTRAVARIANT

INVARIANT

public static final Variance INVARIANT

DEFAULT

public static final Variance DEFAULT

PENDING

public static final Variance PENDING

internal use: variance inference

WILD_COVARIANT

public static final Variance WILD_COVARIANT

internal use: Java interop

WILD_CONTRAVARIANT

public static final Variance WILD_CONTRAVARIANT

internal use: Java interop

Field Details

SUPPORT_DEFAULT_VARIANCE_CHECKING

private static final boolean SUPPORT_DEFAULT_VARIANCE_CHECKING

See Also:

• Constant Field Values

DEFAULT_VARIANCE_MAP

private static final TypeSystemAwareCache<IType, Map<String,Variance>> DEFAULT_VARIANCE_MAP

_desc

private final String _desc

_sign

private final char _sign

Constructor Details

Variance

private Variance(String desc,
 char sign)

Method Details

values

public static Variance[] values()

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

Returns:

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

valueOf

public static Variance 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

getDesc

public String getDesc()

getSymbol

public char getSymbol()

verifyTypeVarVariance

public static void verifyTypeVarVariance(Variance variance,
 IType enclosingType,
 Variance.IVarianceVerifier verifier,
 IType type)

getVariance

private static Variance getVariance(ITypeVariableType type)

maybeInferVariance

public static Variance maybeInferVariance(IType type,
 IGenericTypeVariable gtv)

isTypeVarFromEnclosingType

private static boolean isTypeVarFromEnclosingType(IType enclosingType,
 ITypeVariableType typeVar)

inferVariance

private static void inferVariance(IType genericType,
 Map<String,Variance> map)

verifyDefaultForVariance

private static boolean verifyDefaultForVariance(IType type)

verifyDefaultTypeVarVariance

public static void verifyDefaultTypeVarVariance(IType enclosingType,
 Variance ctxVariance,
 IType... types)

invertVariance

private static Variance invertVariance(Variance variance)