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com.google.javascript.rhino.jstype
Class ParameterizedType

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.ParameterizedType
All Implemented Interfaces:
StaticScope<JSType>, Serializable
public final class ParameterizedType
extends ObjectType

An object type with a declared default element type, such as Array.. // TODO(user): Define the subtyping relation for parameterized types. Also, take parameterized type into account for equality.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class com.google.javascript.rhino.jstype.ObjectType
ObjectType.Property
 
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, UNKNOWN_NAME
 
Method Summary
 boolean canAssignTo(JSType that)
          Tests whether values of this type can be safely assigned to values of that type.
 boolean canBeCalled()
          This predicate is used to test whether a given type can be used as the 'function' in a function call.
 JSType collapseUnion()
          Gets the least supertype of this that's not a union.
protected  void collectPropertyNames(Set<String> props)
          Adds any properties defined on this type or its supertypes to the set.
 JSType findPropertyType(String propertyName)
          Coerces this type to an Object type, then gets the type of the property whose name is given.
 FunctionType getConstructor()
          Gets this object's constructor.
 Iterable<ObjectType> getCtorImplementedInterfaces()
          Gets the interfaces implemented by the ctor associated with this type.
 ObjectType getImplicitPrototype()
          Gets the implicit prototype (a.k.a.
 JSType getIndexType()
          Gets the declared default index type.
 JSDocInfo getJSDocInfo()
          Gets the docInfo for this type.
 FunctionType getOwnerFunction()
          Gets the owner of this if it's a function prototype.
 JSDocInfo getOwnPropertyJSDocInfo(String propertyName)
          Gets the docInfo on the specified property on this type.
 Set<String> getOwnPropertyNames()
          Returns the names of all the properties directly on this type.
 JSType getParameterType()
          Gets the declared default element type.
 int getPropertiesCount()
          Gets the number of properties of this object.
 Node getPropertyNode(String propertyName)
          Gets the node corresponding to the definition of the specified property.
 JSType getPropertyType(String propertyName)
          Gets the property type of the property whose name is given.
 String getReferenceName()
          Gets the reference name for this object.
 ObjectType.Property getSlot(String name)
          Returns any defined slot within this scope for this name.
 ObjectType getTypeOfThis()
          Returns the expected type of this in the current scope.
 boolean hasAnyTemplateInternal()
           
 int hashCode()
           
 boolean hasOwnProperty(String propertyName)
          Checks whether the property whose name is given is present directly on the object.
 boolean hasProperty(String propertyName)
          Checks whether the property whose name is given is present on the object.
 boolean hasReferenceName()
          Returns true if the object is named.
 boolean isAllType()
           
 boolean isCheckedUnknownType()
           
 boolean isConstructor()
          Whether this type is a FunctionType that is a constructor or a named type that points to such a type.
 boolean isEquivalentTo(JSType that)
          Checks if two types are equivalent.
 boolean isInstanceType()
          Whether this type is an Instance object of some constructor.
 boolean isInterface()
          Whether this type is a FunctionType that is an interface or a named type that points to such a type.
 boolean isNativeObjectType()
          Whether this is a built-in object.
 boolean isNominalType()
          Whether this type is a nominal type (a named instance object or a named enum).
 boolean isNoObjectType()
           
 boolean isNoResolvedType()
           
 boolean isNoType()
           
 boolean isNullable()
          Tests whether this type is nullable.
 boolean isOrdinaryFunction()
          Whether this type is a FunctionType that is an ordinary function or a named type that points to such a type.
 boolean isPropertyInExterns(String propertyName)
          Checks whether the property was defined in the externs.
 boolean isPropertyTypeDeclared(String propertyName)
          Checks whether the property's type is declared.
 boolean isPropertyTypeInferred(String propertyName)
          Checks whether the property's type is inferred.
 boolean isSubtype(JSType that)
          Checks whether this is a subtype of that.
 boolean isUnknownType()
          We treat this as the unknown type if any of its implicit prototype properties is unknown.
 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.
 boolean removeProperty(String name)
          Removes the declared or inferred property from this ObjectType.
 void setJSDocInfo(JSDocInfo info)
          Sets the docInfo for this type from the given JSDocInfo.
 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.
 String toDebugHashCodeString()
          A hash code function for diagnosing complicated issues around type-identity.
 EnumElementType toMaybeEnumElementType()
          Downcasts this to an EnumElementType, or returns null if this is not an EnumElementType.
 EnumType toMaybeEnumType()
          Downcasts this to an EnumType, or returns null if this is not an EnumType.
 FunctionType toMaybeFunctionType()
          Downcasts this to a FunctionType, or returns null if this is not a function.
 ParameterizedType toMaybeParameterizedType()
          Downcasts this to a ParameterizedType, or returns null if this is not a function.
 TemplateType toMaybeTemplateType()
          Downcasts this to a TemplateType, or returns null if this is not a function.
 UnionType toMaybeUnionType()
          Downcasts this to a UnionType, or returns null if this is not a UnionType.
<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, getCtorExtendedInterfaces, getDisplayName, getNormalizedReferenceName, getOwnSlot, getParentScope, getPossibleToBooleanOutcomes, getPropertyNames, getRootNode, hasCachedValues, isFunctionPrototypeType, isObject
 
Methods inherited from class com.google.javascript.rhino.jstype.JSType
autobox, autoboxesTo, canTestForEqualityWith, canTestForShallowEqualityWith, clearResolved, dereference, differsFrom, equals, forceResolve, getGreatestSubtype, getLeastSupertype, getRestrictedTypeGivenToBooleanOutcome, getTypesUnderEquality, getTypesUnderInequality, getTypesUnderShallowEquality, getTypesUnderShallowInequality, hasAnyTemplate, hasDisplayName, isArrayType, isBooleanObjectType, isBooleanValueType, isDateType, isEmptyType, isEnumElementType, isEnumType, isEquivalent, isFunctionType, isGlobalThisType, isNominalConstructor, isNullType, isNumber, isNumberObjectType, isNumberValueType, isParameterizedType, isRecordType, isRegexpType, isResolved, isString, isStringObjectType, isStringValueType, isTemplateType, isUnionType, isVoidType, matchesInt32Context, matchesUint32Context, resolve, restrictByNotNullOrUndefined, setValidator, toAnnotationString, toMaybeFunctionType, toMaybeParameterizedType, toMaybeTemplateType, toObjectType, toString, unboxesTo
 
Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

getParameterType

public JSType getParameterType()
Description copied from class: ObjectType
Gets the declared default element type.

See Also:
ParameterizedType

isEquivalentTo

public boolean isEquivalentTo(JSType that)
Description copied from class: JSType
Checks if two types are equivalent.

visit

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

Returns:
the value returned by the visitor
See Also:
Visitor

toMaybeParameterizedType

public ParameterizedType toMaybeParameterizedType()
Description copied from class: JSType
Downcasts this to a ParameterizedType, or returns null if this is not a function.

hasAnyTemplateInternal

public boolean hasAnyTemplateInternal()

getSlot

public ObjectType.Property getSlot(String name)
Description copied from interface: StaticScope
Returns any defined slot within this scope for this name. This call continues searching through parent scopes if a slot with this name is not found in the current scope.

Specified by:
getSlot in interface StaticScope<JSType>
Specified by:
getSlot in class ObjectType
Parameters:
name - The name of the variable slot to look up.
Returns:
The defined slot for the variable, or null if no definition exists.

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

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.

Overrides:
matchesNumberContext in class JSType

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.

Overrides:
matchesStringContext in class JSType

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.

Overrides:
matchesObjectContext in class JSType

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.

isNoType

public boolean isNoType()
Overrides:
isNoType in class JSType

isNoObjectType

public boolean isNoObjectType()
Overrides:
isNoObjectType in class JSType

isNoResolvedType

public boolean isNoResolvedType()
Overrides:
isNoResolvedType in class JSType

isUnknownType

public boolean isUnknownType()
Description copied from class: ObjectType
We treat this as the unknown type if any of its implicit prototype properties is unknown.

Overrides:
isUnknownType in class ObjectType

isCheckedUnknownType

public boolean isCheckedUnknownType()
Overrides:
isCheckedUnknownType in class JSType

isNullable

public boolean isNullable()
Description copied from class: JSType
Tests whether this type is nullable.

Overrides:
isNullable in class JSType

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

isConstructor

public boolean isConstructor()
Description copied from class: JSType
Whether this type is a FunctionType that is a constructor or a named type that points to such a type.

Overrides:
isConstructor in class JSType

isNominalType

public boolean isNominalType()
Description copied from class: JSType
Whether this type is a nominal type (a named instance object or a named enum).

Overrides:
isNominalType in class JSType

isInstanceType

public boolean isInstanceType()
Description copied from class: JSType
Whether this type is an Instance object of some constructor. Does not necessarily mean this is an InstanceObjectType.

Overrides:
isInstanceType in class JSType

isInterface

public boolean isInterface()
Description copied from class: JSType
Whether this type is a FunctionType that is an interface or a named type that points to such a type.

Overrides:
isInterface in class JSType

isOrdinaryFunction

public boolean isOrdinaryFunction()
Description copied from class: JSType
Whether this type is a FunctionType that is an ordinary function or a named type that points to such a type.

Overrides:
isOrdinaryFunction in class JSType

isAllType

public boolean isAllType()
Overrides:
isAllType in class JSType

isNativeObjectType

public boolean isNativeObjectType()
Description copied from class: ObjectType
Whether this is a built-in object.

Overrides:
isNativeObjectType in class ObjectType

toMaybeUnionType

public UnionType toMaybeUnionType()
Description copied from class: JSType
Downcasts this to a UnionType, or returns null if this is not a UnionType. Named in honor of Haskell's Maybe type constructor.

Overrides:
toMaybeUnionType in class JSType

toMaybeFunctionType

public FunctionType toMaybeFunctionType()
Description copied from class: JSType
Downcasts this to a FunctionType, or returns null if this is not a function. For the purposes of this function, we define a MaybeFunctionType as any type in the sub-lattice { x | LEAST_FUNCTION_TYPE <= x <= GREATEST_FUNCTION_TYPE } This definition excludes bottom types like NoType and NoObjectType. This definition is somewhat arbitrary and axiomatic, but this is the definition that makes the most sense for the most callers.

Overrides:
toMaybeFunctionType in class JSType

toMaybeEnumElementType

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

Overrides:
toMaybeEnumElementType in class JSType

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:

Overrides:
isSubtype in class JSType
Returns:
this &lt;: that

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

canAssignTo

public boolean canAssignTo(JSType that)
Description copied from class: JSType
Tests whether values of this type can be safely assigned to values of that type.

The default implementation verifies that this is a subtype of that.

Overrides:
canAssignTo in class JSType

hashCode

public int hashCode()
Overrides:
hashCode in class JSType

getImplicitPrototype

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

Specified by:
getImplicitPrototype in class ObjectType

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.

isPropertyTypeDeclared

public boolean isPropertyTypeDeclared(String propertyName)
Description copied from class: ObjectType
Checks whether the property's type is declared.

Specified by:
isPropertyTypeDeclared in class ObjectType

getPropertyNode

public Node getPropertyNode(String propertyName)
Description copied from class: ObjectType
Gets the node corresponding to the definition of the specified property. This could be the node corresponding to declaration of the property or the node corresponding to the first reference to this property, e.g., "this.propertyName" in a constructor. Note this is mainly intended to be an estimate of where in the source code a property is defined. Sometime the returned node is not even part of the global AST but in the AST of the JsDoc that defines a type.

Overrides:
getPropertyNode in class ObjectType
Parameters:
propertyName - the name of the property
Returns:
the Node corresponding to the property or null.

isPropertyTypeInferred

public boolean isPropertyTypeInferred(String propertyName)
Description copied from class: ObjectType
Checks whether the property's type is inferred.

Specified by:
isPropertyTypeInferred in class ObjectType

isPropertyInExterns

public boolean isPropertyInExterns(String propertyName)
Description copied from class: ObjectType
Checks whether the property was defined in the externs.

Overrides:
isPropertyInExterns in class ObjectType

getPropertiesCount

public int getPropertiesCount()
Description copied from class: ObjectType
Gets the number of properties of this object.

Specified by:
getPropertiesCount in class ObjectType

collectPropertyNames

protected void collectPropertyNames(Set<String> props)
Description copied from class: ObjectType
Adds any properties defined on this type or its supertypes to the set.

findPropertyType

public JSType findPropertyType(String propertyName)
Description copied from class: JSType
Coerces this type to an Object type, then gets the type of the property whose name is given. Unlike ObjectType.getPropertyType(java.lang.String), returns null if the property is not found.

Overrides:
findPropertyType in class ObjectType
Returns:
The property's type. null if the current type cannot have properties, or if the type is not found.

getPropertyType

public JSType getPropertyType(String propertyName)
Description copied from class: ObjectType
Gets the property type of the property whose name is given. If the underlying object does not have this property, the Unknown type is returned to indicate that no information is available on this property.

Specified by:
getPropertyType in class ObjectType
Returns:
the property's type or UnknownType. This method never returns null.

getJSDocInfo

public JSDocInfo getJSDocInfo()
Description copied from class: ObjectType
Gets the docInfo for this type.

Overrides:
getJSDocInfo in class ObjectType

setJSDocInfo

public void setJSDocInfo(JSDocInfo info)
Description copied from class: ObjectType
Sets the docInfo for this type from the given JSDocInfo. The JSDocInfo may be null.

Overrides:
setJSDocInfo in class ObjectType

getOwnPropertyJSDocInfo

public JSDocInfo getOwnPropertyJSDocInfo(String propertyName)
Description copied from class: ObjectType
Gets the docInfo on the specified property on this type. This should not be done implemented recursively, as you generally need to know exactly on which type in the prototype chain the JSDocInfo exists.

Overrides:
getOwnPropertyJSDocInfo in class ObjectType

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.

hasProperty

public boolean hasProperty(String propertyName)
Description copied from class: ObjectType
Checks whether the property whose name is given is present on the object.

Specified by:
hasProperty in class ObjectType

hasOwnProperty

public boolean hasOwnProperty(String propertyName)
Description copied from class: ObjectType
Checks whether the property whose name is given is present directly on the object. Returns false even if it is declared on a supertype.

Overrides:
hasOwnProperty in class ObjectType

getOwnPropertyNames

public Set<String> getOwnPropertyNames()
Description copied from class: ObjectType
Returns the names of all the properties directly on this type.

Overrides:
getOwnPropertyNames in class ObjectType

getConstructor

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

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

getIndexType

public JSType getIndexType()
Description copied from class: ObjectType
Gets the declared default index type.

Overrides:
getIndexType in class ObjectType
See Also:
IndexedType

toDebugHashCodeString

public String toDebugHashCodeString()
Description copied from class: JSType
A hash code function for diagnosing complicated issues around type-identity.

Overrides:
toDebugHashCodeString in class JSType

getTypeOfThis

public ObjectType getTypeOfThis()
Description copied from interface: StaticScope
Returns the expected type of this in the current scope.

Specified by:
getTypeOfThis in interface StaticScope<JSType>
Overrides:
getTypeOfThis in class ObjectType

collapseUnion

public JSType collapseUnion()
Description copied from class: JSType
Gets the least supertype of this that's not a union.

Overrides:
collapseUnion in class JSType

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

toMaybeTemplateType

public TemplateType toMaybeTemplateType()
Description copied from class: JSType
Downcasts this to a TemplateType, or returns null if this is not a function.

Overrides:
toMaybeTemplateType in class JSType
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