ptolemy.data.type

Class BaseType.UnknownType

java.lang.Object

ptolemy.data.type.BaseType

ptolemy.data.type.BaseType.UnknownType

All Implemented Interfaces:

Type

Enclosing class:

BaseType

public static class BaseType.UnknownType
extends BaseType

The bottom element of the data type lattice. It represents a type variable.

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.data.type.BaseType

BaseType.ArrayBottomType, BaseType.BooleanType, BaseType.ComplexType, BaseType.DateType, BaseType.DoubleType, BaseType.EventType, BaseType.FloatType, BaseType.GeneralType, BaseType.IntType, BaseType.LongType, BaseType.NilType, BaseType.PetiteType, BaseType.ScalarType, BaseType.ShortType, BaseType.StringType, BaseType.UnknownType, BaseType.UnsignedByteType, BaseType.UnsizedFixType, BaseType.XmlTokenType

Field Summary

Fields inherited from class ptolemy.data.type.BaseType

ACTOR, ARRAY_BOTTOM, BOOLEAN, BOOLEAN_MATRIX, COMPLEX, COMPLEX_MATRIX, DATE, DOUBLE, DOUBLE_MATRIX, EVENT, FIX, FIX_MATRIX, FLOAT, GENERAL, INT, INT_MATRIX, LONG, LONG_MATRIX, MATRIX, NIL, OBJECT, PETITE, RECORD, SCALAR, SHORT, SIZED_FIX, STRING, UNKNOWN, UNSIGNED_BYTE, UNSIZED_FIX, XMLTOKEN

Fields inherited from interface ptolemy.data.type.Type

HASH_INVALID

Method Summary

Modifier and Type	Method and Description
Token	convert(Token t) Convert the specified token to a token having the type represented by this object.
int	getTypeHash() Return a perfect hash for this type.

Methods inherited from class ptolemy.data.type.BaseType

_addType, add, clone, divide, equals, forClassName, forName, getTokenClass, hashCode, isAbstract, isCompatible, isConstant, isInstantiable, isSubstitutionInstance, modulo, multiply, one, subtract, toString, zero

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

convert

public Token convert(Token t)
              throws IllegalActionException

Description copied from class: BaseType

Convert the specified token to a token having the type represented by this object.

Specified by:

convert in interface Type

Specified by:

convert in class BaseType

Parameters:

t - A token.

Returns:

A token.

Throws:

IllegalActionException - If lossless conversion cannot be done.

getTypeHash

public int getTypeHash()

Description copied from class: BaseType

Return a perfect hash for this type. This number corresponds uniquely to a particular type, and is used to improve performance of certain operations in the TypeLattice class. All instances of a particular type (e.g. integer array) must return the same number. Types that return HASH_INVALID will not have results in TypeLattice cached. Note that it is safer to return HASH_INVALID, than to return a number that is not unique, or different number for the same type from different instances. This base class returns HASH_INVALID.

Specified by:

getTypeHash in interface Type

Overrides:

getTypeHash in class BaseType

Returns:

A number greater than or equal to 0, or HASH_INVALID.