An extension, that is, a type name with optional type arguments and optional arguments, optionally qualified with a package or super qualifier.

(Note: the specification’s BaseExtension and SuperExtension have been inlined into this node.)

Examples:

Object()
package.Object
super.Inner

no subtypes hierarchy

Initializer
Extension(TypeNameWithTypeArguments nameAndArgs, PositionalArguments? arguments, PackageQualifier|Super? qualifier = null)
Parameters:
  • nameAndArgs

    The name of the extended class.

  • arguments

    The arguments to the extended class, if any.

  • qualifier = null

    The qualifier, if any.

    This can be:

    • a package qualifier (PackageQualifier) to specify that the class belongs to the same package,
    • a super qualifier (Super) to specify that the class is an inner class of the superclass, or
    • null to specify that the class is discovered the usual way.
Attributes
argumentsshared actual PositionalArguments? arguments

The arguments to the extended class, if any.

childrenshared actual <TypeNameWithTypeArguments|PositionalArguments|PackageQualifier|Super>[] children

The child nodes of this node.

hashshared actual Integer hash

The hash value of the value, which allows the value to be an element of a hash-based set or key of a hash-based map. Implementations must respect the constraint that:

  • if x==y then x.hash==y.hash.

Therefore, a class which refines equals must also refine hash.

Because the Integer type is platform-dependent a compiler for a given platform is permitted to further manipulate the calculated hash for an object, and the resulting hash may differ between platforms.

Refines Object.hash
nameAndArgsshared actual TypeNameWithTypeArguments nameAndArgs

The name of the extended class.

qualifiershared actual PackageQualifier|Super? qualifier

The qualifier, if any.

This can be:

  • a package qualifier (PackageQualifier) to specify that the class belongs to the same package,
  • a super qualifier (Super) to specify that the class is an inner class of the superclass, or
  • null to specify that the class is discovered the usual way.
Inherited Attributes
Attributes inherited from: ExtensionOrConstruction
Attributes inherited from: Node
Attributes inherited from: Object
hash, string
Methods
copyshared Extension copy(TypeNameWithTypeArguments nameAndArgs = ..., PositionalArguments? arguments = ..., PackageQualifier|Super? qualifier = ...)
Parameters:
  • nameAndArgs = this.nameAndArgs
  • arguments = this.arguments
  • qualifier = this.qualifier
equalsshared actual Boolean equals(Object that)

Determine if two values are equal. Implementations should respect the constraints that:

  • if x===y then x==y (reflexivity),
  • if x==y then y==x (symmetry),
  • if x==y and y==z then x==z (transitivity).

Furthermore it is recommended that implementations ensure that if x==y then x and y have the same concrete class.

A class which explicitly refines equals() is said to support value equality, and the equality operator == is considered much more meaningful for such classes than for a class which simply inherits the default implementation of identity equality from Identifiable.

Refines Object.equals
transformshared actual Result transform<out Result>(Transformer<Result> transformer)

Transform this node with the given transformer by calling the appropriate transformX method on the transformer.

If you have a Node node that’s actually an LIdentifier instance, then the runtime will call LIdentifier.transform; therefore, this method is by nature narrowing. This means that if transformer is a NarrowingTransformer, calling node.transform(transformer) is equivalent to calling transformer.transformNode(node). On the other hand, if transformer is a WideningTransformer, then the two operations are very different.

visitshared actual void visit(Visitor visitor)

Visit this node with the given visitor. Calls the appropriate visitX method on the visitor.

Refines Node.visit
Inherited Methods
Methods inherited from: Node
Methods inherited from: Object
equals