Package net.hydromatic.morel.type

Class DataType

java.lang.Object

net.hydromatic.morel.type.BaseType

net.hydromatic.morel.type.ParameterizedType

net.hydromatic.morel.type.DataType

All Implemented Interfaces:

NamedType, Type

public class DataType
extends ParameterizedType

Algebraic type.

Nested Class Summary

Nested classes/interfaces inherited from interface net.hydromatic.morel.type.Type

Type.Key

Field Summary

Fields

Modifier and Type	Field	Description
final List<Type>	arguments
final SortedMap<String,Type.Key>	typeConstructors

Fields inherited from class net.hydromatic.morel.type.ParameterizedType

moniker, name, parameterTypes

Fields inherited from class net.hydromatic.morel.type.BaseType

op

Constructor Summary

Constructors

Modifier	Constructor	Description
(package private)	DataType(String name, String moniker, List<? extends Type> arguments, SortedMap<String,Type.Key> typeConstructors)	Creates a DataType.
protected	DataType(Op op, String name, String moniker, List<? extends Type> arguments, SortedMap<String,Type.Key> typeConstructors)	Called only from DataType constructor.

Method Summary

Modifier and Type	Method	Description
<R> R	accept(TypeVisitor<R> typeVisitor)
DataType	copy(TypeSystem typeSystem, UnaryOperator<Type> transform)	Copies this type, applying a given transform to component types, and returning the original type if the component types are unchanged.
StringBuilder	describe(StringBuilder buf)	Writes out the definition of the datatype.
Type.Key	key()	Description of the type, e.g.
SortedMap<String,Type>	typeConstructors(TypeSystem typeSystem)

Methods inherited from class net.hydromatic.morel.type.ParameterizedType

computeMoniker, moniker, name, toString

Methods inherited from class net.hydromatic.morel.type.BaseType

op

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.hydromatic.morel.type.Type

isProgressive, op, substitute

Field Details

arguments

public final List<Type> arguments

typeConstructors

public final SortedMap<String,Type.Key> typeConstructors

Constructor Details

DataType

DataType(String name,
 String moniker,
 List<? extends Type> arguments,
 SortedMap<String,Type.Key> typeConstructors)

Creates a DataType.

Called only from TypeSystem.dataTypes(List).

If the typeSystem argument is specified, canonizes the types inside type-constructors. This also allows temporary types (necessary while creating self-referential data types) to be replaced with real DataType instances.

During replacement, if a type matches placeholderType it is replaced with this. This allows cyclic graphs to be copied.

DataType

protected DataType(Op op,
 String name,
 String moniker,
 List<? extends Type> arguments,
 SortedMap<String,Type.Key> typeConstructors)

Called only from DataType constructor.

Method Details

key

public Type.Key key()

Description copied from interface: Type

Description of the type, e.g. "int", "int -> int", "NONE | SOME of 'a".

accept

public <R> R accept(TypeVisitor<R> typeVisitor)

typeConstructors

public SortedMap<String,Type> typeConstructors(TypeSystem typeSystem)

copy

public DataType copy(TypeSystem typeSystem,
 UnaryOperator<Type> transform)

Description copied from interface: Type

Copies this type, applying a given transform to component types, and returning the original type if the component types are unchanged.

describe

public StringBuilder describe(StringBuilder buf)

Writes out the definition of the datatype. For example,

datatype ('a,'b) tree = Empty | Node of ('a,'b) tree * 'b * 'a * ('a,'b) tree