xtc.type
Class Parameter

java.lang.Object
  xtc.tree.Node
      xtc.type.Type
          xtc.type.Parameter

All Implemented Interfaces:

java.lang.Iterable<java.lang.Object>, Locatable

Direct Known Subclasses:

InternalParameter, NamedParameter, Wildcard

public abstract class Parameter
extends Type

The superclass of all type parameters. When a type is parameterized, all occurrences of the same parameter should also be the same instance of a subclass. Furthermore, the type should be wrapped in a ParameterizedT listing all parameters. Instantiation of a parameterized type does not require replacing all parameters, but rather should be implemented by wrapping the paramterized type in an InstantiatedT listing all arguments. To support efficient unification, this class implements union/find operations with path compression through the bind(Type) and lookup() operations.

Version:

$Revision: 1.4 $

Author:

Robert Grimm

Nested Class Summary

Nested classes/interfaces inherited from class xtc.type.Type

Type.Tag

Constructor Summary

Parameter()
Create a new parameter.

Parameter(Type template)
Create a new parameter.

Method Summary

void	bind(Type type) Bind this parameter to the specified type.
boolean	isParameter() Determine whether this type is a type parameter.
Type	lookup() Look up this parameter's binding.
Parameter	toParameter() Get this type as a type parameter.

Methods inherited from class xtc.type.Type

addAttribute, annotate, attribute, attribute, attribute, attributes, cast, checkNotSealed, constant, constant, copy, copy, deannotate, getAttribute, getAttribute, getConstant, getConstant, getLanguage, getLanguage, getLocation, getLocation, getScope, getScope, getShape, getShape, hasAlias, hasAnnotated, hasAttribute, hasAttribute, hasAttribute, hasAttribute, hasAttributes, hasConstant, hasConstant, hasEnum, hasEnumerator, hasError, hasInstantiated, hasLanguage, hasLanguage, hasLocation, hasLocation, hasParameterized, hasScope, hasScope, hasShape, hasShape, hasStructOrUnion, hasTag, hasTagged, hasVariable, hasWTag, isAlias, isAnnotated, isArray, isBoolean, isClass, isConcrete, isDerived, isEnum, isEnumerator, isError, isFloat, isFunction, isInstantiated, isInteger, isInterface, isInternal, isInternalParameter, isLabel, isMethod, isNamedParameter, isNumber, isPackage, isParameterized, isPointer, isSealed, isStruct, isTuple, isUnion, isUnit, isVariable, isVariant, isVoid, isWildcard, isWrapped, language, locate, locate, mark, properties, removeAttribute, removeProperty, resolve, resolve, scope, seal, seal, setLocation, setLocation, setProperty, shape, shape, tag, toAlias, toAnnotated, toArray, toBoolean, toClass, toEnum, toEnumerator, toFloat, toFunction, toInstantiated, toInteger, toInterface, toInternal, toInternalParameter, toLabel, toMethod, toNamedParameter, toNumber, toPackage, toParameterized, toPointer, toStruct, toStructOrUnion, toTagged, toTuple, toUnion, toUnit, toVariable, toVariant, toVoid, toWildcard, toWrapped, trace, wtag

Methods inherited from class xtc.tree.Node

add, add, addAll, addAll, addAll, addAll, addAllTo, addNode, contains, get, getBoolean, getBooleanProperty, getGeneric, getList, getName, getNode, getProperty, getString, getStringProperty, getTokenText, hasName, hasProperty, hasTraversal, indexOf, isAnnotation, isEmpty, isGeneric, isList, isToken, iterator, lastIndexOf, remove, set, size, strip, toAnnotation, toList, toString, toToken, write

Methods inherited from class java.lang.Object

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

Constructor Detail

Parameter

public Parameter()

Create a new parameter.

Parameter

public Parameter(Type template)

Create a new parameter.

Parameters:

template - The type whose annotations to copy.

Method Detail

isParameter

public boolean isParameter()

Description copied from class: Type

Determine whether this type is a type parameter.

Overrides:

isParameter in class Type

Returns:

true if this type is a parameter.

toParameter

public Parameter toParameter()

Description copied from class: Type

Get this type as a type parameter.

Overrides:

toParameter in class Type

Returns:

This type as a parameter.

bind

public void bind(Type type)

Bind this parameter to the specified type.

Parameters:

type - The type.

Throws:

java.lang.IllegalStateException - Signals that this parameter is sealed or already bound.

lookup

public Type lookup()

Look up this parameter's binding. If this parameter is not bound, this method returns the parameter. Otherwise, it returns the bound type.

Returns:

This parameter's binding.