BaseType.NilType

java.lang.Object
- ptolemy.data.type.BaseType
- - ptolemy.data.type.BaseType.NilType

All Implemented Interfaces:

Type

Enclosing class:

BaseType
```
public static class BaseType.NilType
extends BaseType
```
The nil data type.

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

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	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
add, addType, 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.