com.google.javascript.rhino.jstype
Class EnumType

java.lang.Object
  extended by com.google.javascript.rhino.jstype.JSType
      extended by com.google.javascript.rhino.jstype.ObjectType
          extended by com.google.javascript.rhino.jstype.EnumType
All Implemented Interfaces:
StaticScope<JSType>, Serializable

public class EnumType
extends ObjectType

An enum type representing a branded collection of elements. Each element is referenced by its name, and has an EnumElementType type.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class com.google.javascript.rhino.jstype.JSType
JSType.TypePair
 
Field Summary
 
Fields inherited from class com.google.javascript.rhino.jstype.JSType
EMPTY_TYPE_COMPONENT, ENUMDECL, NOT_A_CLASS, NOT_A_TYPE, NOT_ENUMDECL, templateTypeMap, UNKNOWN_NAME
 
Method Summary
 boolean canBeCalled()
          This predicate is used to test whether a given type can be used as the 'function' in a function call.
 boolean defineElement(String name, Node definingNode)
          Defines a new element on this enum.
 FunctionType getConstructor()
          Gets this object's constructor.
 Iterable<ObjectType> getCtorExtendedInterfaces()
          Gets the interfaces extended by the interface associated with this type.
 Iterable<ObjectType> getCtorImplementedInterfaces()
          Gets the interfaces implemented by the ctor associated with this type.
 String getDisplayName()
          Returns a user meaningful label for the JSType instance.
 Set<String> getElements()
          Gets the elements defined on this enum.
 EnumElementType getElementsType()
          Gets the elements' type.
 ObjectType getImplicitPrototype()
          Gets the implicit prototype (a.k.a.
 FunctionType getOwnerFunction()
          Gets the owner of this if it's a function prototype.
 String getReferenceName()
          Gets the reference name for this object.
 Node getSource()
          Gets the source node or null if this is an unknown enum.
 boolean hasCachedValues()
          Returns true if any cached values have been set for this type.
 boolean hasReferenceName()
          Returns true if the object is named.
 boolean isNativeObjectType()
          Whether this is a built-in object.
 boolean isSubtype(JSType that)
          Checks whether this is a subtype of that.
 void matchConstraint(JSType constraint)
          Modify this type so that it matches the specified type.
 boolean matchesNumberContext()
          This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.
 boolean matchesObjectContext()
          This predicate is used to test whether a given type can appear in an Object context, such as the expression in a with statement.
 boolean matchesStringContext()
          This predicate is used to test whether a given type can appear in a String context, such as an operand of a string concat (+) operator.
 void matchRecordTypeConstraint(ObjectType constraintObj)
           
 boolean removeProperty(String name)
          Removes the declared or inferred property from this ObjectType.
 void setPropertyJSDocInfo(String propertyName, JSDocInfo info)
          Sets the docInfo for the specified property from the JSDocInfo on its definition.
 TernaryValue testForEquality(JSType that)
          Compares this and that.
 EnumType toMaybeEnumType()
          Downcasts this to an EnumType, or returns null if this is not an EnumType.
 JSType unboxesTo()
          Turn an object type to its corresponding scalar type.
<T> T
visit(Visitor<T> visitor)
          Visit this type with the given visitor.
 
Methods inherited from class com.google.javascript.rhino.jstype.ObjectType
cast, clearCachedValues, createDelegateSuffix, defineDeclaredProperty, defineInferredProperty, defineSynthesizedProperty, findPropertyType, getJSDocInfo, getNormalizedReferenceName, getOwnPropertyJSDocInfo, getOwnPropertyNames, getOwnSlot, getParentScope, getPossibleToBooleanOutcomes, getPropertiesCount, getPropertyNames, getPropertyNode, getPropertyType, getRootNode, getSlot, getTemplateTypes, getTypeOfThis, hasOwnProperty, hasProperty, isFunctionPrototypeType, isObject, isPropertyInExterns, isPropertyTypeDeclared, isPropertyTypeInferred, isUnknownType, setJSDocInfo
 
Methods inherited from class com.google.javascript.rhino.jstype.JSType
autobox, autoboxesTo, canCastTo, canTestForEqualityWith, canTestForShallowEqualityWith, clearResolved, collapseUnion, dereference, differsFrom, equals, forceResolve, getGreatestSubtype, getLeastSupertype, getRestrictedTypeGivenToBooleanOutcome, getTemplateTypeMap, getTypesUnderEquality, getTypesUnderInequality, getTypesUnderShallowEquality, getTypesUnderShallowInequality, hasAnyTemplateTypes, hasDisplayName, hashCode, isAllType, isArrayType, isBooleanObjectType, isBooleanValueType, isCheckedUnknownType, isConstructor, isDateType, isDict, isEmptyType, isEnumElementType, isEnumType, isEquivalent, isEquivalentTo, isFunctionType, isGlobalThisType, isInstanceType, isInterface, isInvariant, isNominalConstructor, isNominalType, isNoObjectType, isNoResolvedType, isNoType, isNullable, isNullType, isNumber, isNumberObjectType, isNumberValueType, isOrdinaryFunction, isRecordType, isRegexpType, isResolved, isString, isStringObjectType, isStringValueType, isStruct, isTemplateType, isTemplatizedType, isUnionType, isVoidType, matchesInt32Context, matchesUint32Context, resolve, restrictByNotNullOrUndefined, setValidator, toAnnotationString, toDebugHashCodeString, toMaybeEnumElementType, toMaybeFunctionType, toMaybeFunctionType, toMaybeTemplateType, toMaybeTemplateType, toMaybeTemplatizedType, toMaybeTemplatizedType, toMaybeUnionType, toObjectType, toString
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

getSource

public Node getSource()
Gets the source node or null if this is an unknown enum.


toMaybeEnumType

public EnumType toMaybeEnumType()
Description copied from class: JSType
Downcasts this to an EnumType, or returns null if this is not an EnumType.

Overrides:
toMaybeEnumType in class JSType

getImplicitPrototype

public ObjectType getImplicitPrototype()
Description copied from class: ObjectType
Gets the implicit prototype (a.k.a. the [[Prototype]] property).


getElements

public Set<String> getElements()
Gets the elements defined on this enum.

Returns:
the elements' names defined on this enum. The returned set is immutable.

defineElement

public boolean defineElement(String name,
                             Node definingNode)
Defines a new element on this enum.

Parameters:
name - the name of the new element
definingNode - the Node that defines this new element
Returns:
true iff the new element is added successfully

getElementsType

public EnumElementType getElementsType()
Gets the elements' type.


testForEquality

public TernaryValue testForEquality(JSType that)
Description copied from class: JSType
Compares this and that.

Overrides:
testForEquality in class ObjectType
Returns:
  • TernaryValue.TRUE if the comparison of values of this type and that always succeed (such as undefined compared to null)
  • TernaryValue.FALSE if the comparison of values of this type and that always fails (such as undefined compared to number)
  • TernaryValue.UNKNOWN if the comparison can succeed or fail depending on the concrete values

isSubtype

public boolean isSubtype(JSType that)
Description copied from class: JSType
Checks whether this is a subtype of that.

Subtyping rules:

Returns:
this &lt;: that

getDisplayName

public String getDisplayName()
Description copied from class: JSType
Returns a user meaningful label for the JSType instance. For example, Functions and Enums will return their declaration name (if they have one). Some types will not have a meaningful display name. Calls to hasDisplayName() will return true IFF getDisplayName() will return null or a zero length string.

Overrides:
getDisplayName in class ObjectType
Returns:
the display name of the type, or null if one is not available

visit

public <T> T visit(Visitor<T> visitor)
Description copied from class: JSType
Visit this type with the given visitor.

Overrides:
visit in class ObjectType
Returns:
the value returned by the visitor
See Also:
Visitor

getConstructor

public FunctionType getConstructor()
Description copied from class: ObjectType
Gets this object's constructor.

Returns:
this object's constructor or null if it is a native object (constructed natively v.s. by instantiation of a function)

matchesNumberContext

public boolean matchesNumberContext()
Description copied from class: JSType
This predicate is used to test whether a given type can appear in a numeric context, such as an operand of a multiply operator.


matchesStringContext

public boolean matchesStringContext()
Description copied from class: JSType
This predicate is used to test whether a given type can appear in a String context, such as an operand of a string concat (+) operator. All types have at least the potential for converting to String. When we add externally defined types, such as a browser OM, we may choose to add types that do not automatically convert to String.


matchesObjectContext

public boolean matchesObjectContext()
Description copied from class: JSType
This predicate is used to test whether a given type can appear in an Object context, such as the expression in a with statement. Most types we will encounter, except notably null, have at least the potential for converting to Object. Host defined objects can get peculiar.


removeProperty

public boolean removeProperty(String name)
Description copied from class: ObjectType
Removes the declared or inferred property from this ObjectType.

Overrides:
removeProperty in class ObjectType
Parameters:
name - the property's name
Returns:
true if the property was removed successfully. False if the property did not exist, or could not be removed.

setPropertyJSDocInfo

public void setPropertyJSDocInfo(String propertyName,
                                 JSDocInfo info)
Description copied from class: ObjectType
Sets the docInfo for the specified property from the JSDocInfo on its definition.

Overrides:
setPropertyJSDocInfo in class ObjectType
info - JSDocInfo for the property definition. May be null.

unboxesTo

public JSType unboxesTo()
Description copied from class: JSType
Turn an object type to its corresponding scalar type.

Overrides:
unboxesTo in class JSType
Returns:
the unboxed type or null if this type does not unbox.

canBeCalled

public boolean canBeCalled()
Description copied from class: JSType
This predicate is used to test whether a given type can be used as the 'function' in a function call.

Overrides:
canBeCalled in class JSType
Returns:
true if this type might be callable.

getReferenceName

public String getReferenceName()
Description copied from class: ObjectType
Gets the reference name for this object. This includes named types like constructors, prototypes, and enums. It notably does not include literal types like strings and booleans and structural types.

Specified by:
getReferenceName in class ObjectType
Returns:
the object's name or null if this is an anonymous object

hasReferenceName

public boolean hasReferenceName()
Description copied from class: ObjectType
Returns true if the object is named.

Overrides:
hasReferenceName in class ObjectType
Returns:
true if the object is named, false if it is anonymous

hasCachedValues

public boolean hasCachedValues()
Description copied from class: ObjectType
Returns true if any cached values have been set for this type. If true, then the prototype chain should not be changed, as it might invalidate the cached values.

Overrides:
hasCachedValues in class ObjectType

isNativeObjectType

public boolean isNativeObjectType()
Whether this is a built-in object.

Overrides:
isNativeObjectType in class ObjectType

getOwnerFunction

public FunctionType getOwnerFunction()
Description copied from class: ObjectType
Gets the owner of this if it's a function prototype.

Overrides:
getOwnerFunction in class ObjectType

getCtorImplementedInterfaces

public Iterable<ObjectType> getCtorImplementedInterfaces()
Description copied from class: ObjectType
Gets the interfaces implemented by the ctor associated with this type. Intended to be overridden by subclasses.

Overrides:
getCtorImplementedInterfaces in class ObjectType

getCtorExtendedInterfaces

public Iterable<ObjectType> getCtorExtendedInterfaces()
Description copied from class: ObjectType
Gets the interfaces extended by the interface associated with this type. Intended to be overridden by subclasses.

Overrides:
getCtorExtendedInterfaces in class ObjectType

matchConstraint

public void matchConstraint(JSType constraint)
Description copied from class: JSType
Modify this type so that it matches the specified type. This is useful for reverse type-inference, where we want to infer that an object literal matches its constraint (much like how the java compiler does reverse-inference to figure out generics).

Overrides:
matchConstraint in class JSType

matchRecordTypeConstraint

public void matchRecordTypeConstraint(ObjectType constraintObj)