Package ptolemy.data

Class UnionToken

java.lang.Object

ptolemy.data.Token

ptolemy.data.AbstractNotConvertibleToken

ptolemy.data.UnionToken

public class UnionToken
extends AbstractNotConvertibleToken

A token that contains a label/token pairs. This pair is one of the choices in a union type, but the exact type is not stored in this class. Operations on union tokens may require that they have the same field in among the possible choices.

Since:

Ptolemy II 5.2

Version:

$Id$

Author:

Yuhong Xiong, Steve Neuendorffer, Elaine Cheong, Edward Lee

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Red (yuhong)

Field Summary

Fields inherited from class ptolemy.data.Token

NIL

Constructor Summary

Constructors

Constructor	Description
UnionToken(java.lang.String init)	Construct a UnionToken from the specified string.
UnionToken(java.lang.String label, Token value)	Construct a UnionToken with the specified label and value.

Method Summary

Modifier and Type	Method	Description
protected Token	_add(Token rightArgument)	Return a new token whose value is the sum of this token and the argument.
protected Token	_divide(Token rightArgument)	Return a new token whose value is the division of this token and the argument.
protected BooleanToken	_isCloseTo(Token rightArgument, double epsilon)	Test whether the value of this token is close to the first argument, where "close" means that the distance between them is less than or equal to the second argument.
protected BooleanToken	_isEqualTo(Token rightArgument)	Return true if the specified token is equal to this one.
protected Token	_modulo(Token rightArgument)	Return a new token whose value is the modulo of this token and the argument.
protected Token	_multiply(Token rightArgument)	Return a new token whose value is the multiplication of this token and the argument.
protected Token	_subtract(Token rightArgument)	Return a new token whose value is the subtraction of this token and the argument.
boolean	equals(java.lang.Object object)	Return true if the argument is an UnionToken with the same label and value.
Type	getType()	Return the type of this token.
int	hashCode()	Return a hash code value for this token.
java.lang.String	label()	Return the label of this token.
Token	one()	Returns a new UnionToken representing the multiplicative identity.
java.lang.String	toString()	Return the value of this token as a string.
Token	value()	Return the value of this token.
Token	zero()	Returns a new UnionToken representing the additive identity.

Methods inherited from class ptolemy.data.AbstractNotConvertibleToken

add, addReverse, divide, divideReverse, isCloseTo, isEqualTo, modulo, moduloReverse, multiply, multiplyReverse, notSupportedDifferentClassesMessage, subtract, subtractReverse

Methods inherited from class ptolemy.data.Token

isCloseTo, isNil, notSupportedConversionMessage, notSupportedIncomparableConversionMessage, notSupportedIncomparableMessage, notSupportedMessage, notSupportedNullNilStringMessage, pow, zeroReturnType

Methods inherited from class java.lang.Object

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

Constructor Detail

UnionToken

public UnionToken(java.lang.String label,
                  Token value)
           throws IllegalActionException

Construct a UnionToken with the specified label and value.

Parameters:

label - The label.

value - The value of this token.

Throws:

IllegalActionException - If the label or the value is null.

UnionToken

public UnionToken(java.lang.String init)
           throws IllegalActionException

Construct a UnionToken from the specified string.

Parameters:

init - A string expression of a record.

Throws:

IllegalActionException - If the string does not contain a parsable record.

Method Detail

equals

public boolean equals(java.lang.Object object)

Return true if the argument is an UnionToken with the same label and value.

Overrides:

equals in class java.lang.Object

Parameters:

object - An instance of Object.

Returns:

True if the argument is equal to this token.

See Also:

hashCode()

getType

public Type getType()

Return the type of this token.

Overrides:

getType in class Token

Returns:

An instance of UnionType containing one field. The label of that field is the label of this token, and the type of that field is the type of the value of this token.

hashCode

public int hashCode()

Return a hash code value for this token. This method returns the hash codes of the value token.

Overrides:

hashCode in class java.lang.Object

Returns:

A hash code value for this token.

label

public java.lang.String label()

Return the label of this token.

Returns:

The label of this token.

one

public Token one()
          throws IllegalActionException

Returns a new UnionToken representing the multiplicative identity. The returned token has the same label as this one, and contains the multiplicative identity of the value of this token.

Overrides:

one in class Token

Returns:

A UnionToken.

Throws:

IllegalActionException - If multiplicative identity is not supported by any value token.

toString

public java.lang.String toString()

Return the value of this token as a string. The syntax is {|label = value|}

Overrides:

toString in class Token

Returns:

A String beginning with "{|" that contains a label and value pair, ending with "|}".

value

public Token value()

Return the value of this token.

Returns:

The value of this token.

zero

public Token zero()
           throws IllegalActionException

Returns a new UnionToken representing the additive identity. The returned token has the same label as this one, and contains the additive identity of the value token.

Overrides:

zero in class Token

Returns:

A UnionToken.

Throws:

IllegalActionException - If additive identity is not supported by any value token.

_add

protected Token _add(Token rightArgument)
              throws IllegalActionException

Return a new token whose value is the sum of this token and the argument. It is assumed that the class of the argument is UnionToken.

Specified by:

_add in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to add to this token.

Returns:

A new UnionToken.

Throws:

IllegalActionException - If the label of the argument and this token are different, or calling the add method on the value token throws it.

_divide

protected Token _divide(Token rightArgument)
                 throws IllegalActionException

Return a new token whose value is the division of this token and the argument. It is assumed that the class of the argument is UnionToken.

Specified by:

_divide in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to divide this token by.

Returns:

A new UnionToken.

Throws:

IllegalActionException - If the label of the argument and this token are different, or calling the divide method on the value token throws it.

_isCloseTo

protected BooleanToken _isCloseTo(Token rightArgument,
                                  double epsilon)
                           throws IllegalActionException

Test whether the value of this token is close to the first argument, where "close" means that the distance between them is less than or equal to the second argument. This method only makes sense for tokens where the distance between them is reasonably represented as a double. It is assumed that the argument is an UnionToken, and the isCloseTo() method of the fields is used. If the fields do not match, then the return value is false.

Specified by:

_isCloseTo in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to compare to this token.

epsilon - The value that we use to determine whether two tokens are close.

Returns:

A token containing true if the value of the first argument is close to the value of this token.

Throws:

IllegalActionException - If thrown by calling isCloseTo() on the value of this Token.

_isEqualTo

protected BooleanToken _isEqualTo(Token rightArgument)
                           throws IllegalActionException

Return true if the specified token is equal to this one. Equal means that both tokens have the same label with the same value. This method is different from equals() in that _isEqualTo() looks for equalities of values irrespective of their types. It is assumed that the type of the argument is UnionToken.

Overrides:

_isEqualTo in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to compare to this token.

Returns:

True if the argument is equal to this.

Throws:

IllegalActionException - If this method is not supported by the derived class.

_modulo

protected Token _modulo(Token rightArgument)
                 throws IllegalActionException

Return a new token whose value is the modulo of this token and the argument. It is assumed that the class of the argument is UnionToken.

Specified by:

_modulo in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to modulo this token by.

Returns:

A new UnionToken.

Throws:

IllegalActionException - If the label of the argument and this token are different, or calling the modulo method on the value token throws it.

_multiply

protected Token _multiply(Token rightArgument)
                   throws IllegalActionException

Return a new token whose value is the multiplication of this token and the argument. It is assumed that the class of the argument is UnionToken.

Specified by:

_multiply in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to multiply this token by.

Returns:

A new UnionToken.

Throws:

IllegalActionException - If the label of the argument and this token are different, or calling the multiply method on the value token throws it.

_subtract

protected Token _subtract(Token rightArgument)
                   throws IllegalActionException

Return a new token whose value is the subtraction of this token and the argument. It is assumed that the class of the argument is UnionToken.

Specified by:

_subtract in class AbstractNotConvertibleToken

Parameters:

rightArgument - The token to subtract from this token.

Returns:

A new UnionToken.

Throws:

IllegalActionException - If the label of the argument and this token are different, or calling the subtract method on the value token throws it.