moduleceylon.ast.core1.3.3
Source Code
ceylon.ast.core
classClassDec
extends TypeDec
OverviewPackageInitializerAttributesMethods

A class reference expression, that is, the name of a class or anonymous class, qualified by a (possibly empty) qualifier (separated from it by a member operator ‘.’), or empty for the current class, prefixed by the type keyword class and surrounded by backticks.

The name may be an LIdentifier to refer to the class declaration of an anonymous class. For example, in

value dec1 = `class null`;
value dec2 = `value null`;

dec1 refers to the anonymous class of the null object, while dec2 refers to the only instance of that class, the null object itself.

The qualifier may only be null if the name is also null. If the name exists, the qualifier must exist as well (but may of course be empty).

Examples:

`class String`
`class A.B.C`
`class`

no subtypes hierarchy

Initializer
ClassDec(Identifier? name, DecQualifier? qualifier = ...)
Parameters:
  • name

    The name of the declaration, or null for a reference to the current type (only in a ClassDec or InterfaceDec).

  • qualifier = r = DecQualifi

    The qualifier of the dec, if present.

Attributes
childrenSource Codeshared actual <DecQualifier|Identifier>[] children

The child nodes of this node.

Refines Expression.children ultimately refines Node.children
hashSource Codeshared 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.

In general, hash values vary between platforms and between executions of the same program.

Note that when executing on a Java Virtual Machine, the 64-bit Integer value returned by an implementation of hash is truncated to a 32-bit integer value by taking the exclusive disjunction of the 32 lowest-order bits with the 32 highest-order bits, before returning the value to the caller.

Refines Object.hash
keywordSource Codeshared actual String keyword

The keyword of the declaration literal, that is:

Refines Dec.keyword
nameSource Codeshared actual Identifier? name

The name of the declaration, or null for a reference to the current type (only in a ClassDec or InterfaceDec).

Refines TypeDec.name
qualifierSource Codeshared actual DecQualifier? qualifier

The qualifier of the dec, if present.

Refines TypeDec.qualifier
Inherited Attributes
Attributes inherited from: Dec
keyword
Attributes inherited from: Expression
children
Attributes inherited from: Node
children, data, string
Attributes inherited from: Object
hash, string
Attributes inherited from: TypeDec
name, qualifier
Methods
copySource Codeshared ClassDec copy(Identifier? name = ..., DecQualifier? qualifier = ...)
Parameters:
  • name = e = this.
  • qualifier = r = this.quali
equalsSource Codeshared actual Boolean equals(Object that)

Determine if two values are equal.

For any two non-null objects x and y, x.equals(y) may be written as:

x == y

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.

Note that an implementation of equals() that always returns false does satisfy the constraints given above, as long as the class does not inherit Identifiable. Therefore, in very rare cases where there is no reasonable definition of value equality for a class, for example, function references (Callable), it is acceptable for equals() to be defined to return false for every argument.

Refines Object.equals
transformSource Codeshared 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.

Refines Node.transform
visitSource Codeshared 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
copyExtraInfoTo(), delete(), get(), getObject(), put(), remove(), set(), transform(), transformChildren(), visit(), visitChildren()
Methods inherited from: Object
equals