ptolemy.data

Class AbstractNotConvertibleToken

java.lang.Object

ptolemy.data.Token

ptolemy.data.AbstractNotConvertibleToken

Direct Known Subclasses:

ArrayToken, RecordToken, UnionToken

public abstract class AbstractNotConvertibleToken
extends Token

The Token base class provides a very general interface for building new data types. However, in many ways, the interface is rather complex in order to allow operations between tokens that are defined in different classes. In particular, this requires the duplicate operation() and operationReverse() methods.

This base class is intended to make it easy to implement tokens where operations are only defined for other tokens that are defined in the same class. In these cases, the operation() and operationReverse() method can share the same code. This class implements these methods to ensure that the argument of each operation is actually an instance of the correct class. The implementation then defers to a protected _operation() method. These protected methods should be overridden in derived classes to provide type-specific operations.

This class is used a base class for ArrayToken and RecordToken. Note that these classes actually represent tokens having different types in the type lattice.

Since:

Ptolemy II 2.1

Version:

$Id$

Author:

Steve Neuendorffer

Pt.AcceptedRating:

Green (cxh)

Pt.ProposedRating:

Green (neuendor)

Field Summary

Fields inherited from class ptolemy.data.Token

NIL

Constructor Summary

Constructors

Constructor and Description
AbstractNotConvertibleToken()

Method Summary

Modifier and Type	Method and Description
protected abstract Token	_add(Token rightArgument) Return a new token whose value is the value of the argument token added to the value of this token.
protected abstract Token	_divide(Token rightArgument) Return a new token whose value is the value of this token divided by the value of the argument token.
protected abstract BooleanToken	_isCloseTo(Token rightArgument, double epsilon) Test that 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 token) Test for equality of the values of this token and the argument.
protected abstract Token	_modulo(Token rightArgument) Return a new token whose value is the value of this token modulo the value of the argument token.
protected abstract Token	_multiply(Token rightArgument) Return a new token whose value is the value of this token multiplied by the value of the argument token.
protected abstract Token	_subtract(Token rightArgument) Return a new token whose value is the value of the argument token subtracted from the value of this token.
Token	add(Token rightArgument) Return a new token whose value is the sum of this token and the argument.
Token	addReverse(Token leftArgument) Return a new token whose value is the sum of this token and the argument.
Token	divide(Token rightArgument) Return a new token whose value is the value of this token divided by the value of the argument token.
Token	divideReverse(Token leftArgument) Return a new token whose value is the value of the argument token divided by the value of this token.
BooleanToken	isCloseTo(Token token, double epsilon) Test that 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.
BooleanToken	isEqualTo(Token rightArgument) Test for equality of the values of this token and the argument token.
Token	modulo(Token rightArgument) Return a new token whose value is the value of this token modulo the value of the argument token.
Token	moduloReverse(Token leftArgument) Return a new token whose value is the value of the argument token modulo the value of this token.
Token	multiply(Token rightArgument) Return a new token whose value is the value of this token multiplied by the value of the argument token.
Token	multiplyReverse(Token leftArgument) Return a new token whose value is the value of the argument token multiplied by the value of this token.
static java.lang.String	notSupportedDifferentClassesMessage(java.lang.String operation, Token firstToken, Token secondToken) Return a string with an error message that states that the given operation is not supported between two tokens, because they have incomparable types and cannot be converted to the same type.
Token	subtract(Token rightArgument) Return a new token whose value is the value of the argument token subtracted from the value of this token.
Token	subtractReverse(Token leftArgument) Return a new token whose value is the value of this token subtracted from the value of the argument token.

Methods inherited from class ptolemy.data.Token

getType, isCloseTo, isNil, notSupportedConversionMessage, notSupportedIncomparableConversionMessage, notSupportedIncomparableMessage, notSupportedMessage, notSupportedNullNilStringMessage, one, pow, toString, zero, zeroReturnType

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractNotConvertibleToken

public AbstractNotConvertibleToken()

Method Detail

add

public Token add(Token rightArgument)
          throws IllegalActionException

Return a new token whose value is the sum of this token and the argument. This base class ensures that the arguments are implemented in the same class, and then defers to the _add() method. Subclasses should override that method to perform type-specific operation

Overrides:

add in class Token

Parameters:

rightArgument - The token to add to this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

addReverse

public Token addReverse(Token leftArgument)
                 throws IllegalActionException

Return a new token whose value is the sum of this token and the argument. This base class ensures that the arguments are implemented in the same class, and then defers to the _add() method. Subclasses should override that method to perform type-specific operation.

Overrides:

addReverse in class Token

Parameters:

leftArgument - The token to add this token to.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

divide

public Token divide(Token rightArgument)
             throws IllegalActionException

Return a new token whose value is the value of this token divided by the value of the argument token. This base class ensures that the arguments are implemented in the same class, and then defers to the _divide() method. Subclasses should override that method to perform type-specific operation.

Overrides:

divide in class Token

Parameters:

rightArgument - The token to divide into this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

divideReverse

public Token divideReverse(Token leftArgument)
                    throws IllegalActionException

Return a new token whose value is the value of the argument token divided by the value of this token. This base class ensures that the arguments are implemented in the same class, and then defers to the _divide() method. Subclasses should override that method to perform type-specific operation.

Overrides:

divideReverse in class Token

Parameters:

leftArgument - The token to be divided by the value of this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

isCloseTo

public BooleanToken isCloseTo(Token token,
                              double epsilon)
                       throws IllegalActionException

Test that 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. This base class ensures that the arguments are implemented in the same class, and then defers to the _isCloseTo() method. Subclasses should override that method to perform type-specific operation.

Overrides:

isCloseTo in class Token

Parameters:

token - The token to test closeness of this token with.

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

Returns:

A boolean token that contains the value true if the value of this token is close to that of the argument token.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes.

isEqualTo

public BooleanToken isEqualTo(Token rightArgument)
                       throws IllegalActionException

Test for equality of the values of this token and the argument token. This base class ensures that the arguments are implemented in the same class, and then defers to the _isEqualTo() method. Subclasses should override that method to perform type-specific operation.

Overrides:

isEqualTo in class Token

Parameters:

rightArgument - The token with which to test equality.

Returns:

A boolean token that contains the value true if the value of this token is equal to that of the argument token.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes.

modulo

public Token modulo(Token rightArgument)
             throws IllegalActionException

Return a new token whose value is the value of this token modulo the value of the argument token. This base class ensures that the arguments are implemented in the same class, and then defers to the _modulo() method. Subclasses should override that method to perform type-specific operation.

Overrides:

modulo in class Token

Parameters:

rightArgument - The token to divide into this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

moduloReverse

public Token moduloReverse(Token leftArgument)
                    throws IllegalActionException

Return a new token whose value is the value of the argument token modulo the value of this token. This base class ensures that the arguments are implemented in the same class, and then defers to the _modulo() method. Subclasses should override that method to perform type-specific operation.

Overrides:

moduloReverse in class Token

Parameters:

leftArgument - The token to apply modulo to by the value of this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

multiply

public Token multiply(Token rightArgument)
               throws IllegalActionException

Return a new token whose value is the value of this token multiplied by the value of the argument token. This base class ensures that the arguments are implemented in the same class, and then defers to the _multiply() method. Subclasses should override that method to perform type-specific operation.

Overrides:

multiply in class Token

Parameters:

rightArgument - The token to multiply this token by.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

multiplyReverse

public Token multiplyReverse(Token leftArgument)
                      throws IllegalActionException

Return a new token whose value is the value of the argument token multiplied by the value of this token. This base class ensures that the arguments are implemented in the same class, and then defers to the _multiply() method. Subclasses should override that method to perform type-specific operation.

Overrides:

multiplyReverse in class Token

Parameters:

leftArgument - The token to be multiplied by the value of this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

notSupportedDifferentClassesMessage

public static java.lang.String notSupportedDifferentClassesMessage(java.lang.String operation,
                                                                   Token firstToken,
                                                                   Token secondToken)

Return a string with an error message that states that the given operation is not supported between two tokens, because they have incomparable types and cannot be converted to the same type.

Parameters:

operation - A string naming the unsupported token operation.

firstToken - The first token in the message.

secondToken - The second token in the message.

Returns:

A string error message.

subtract

public Token subtract(Token rightArgument)
               throws IllegalActionException

Return a new token whose value is the value of the argument token subtracted from the value of this token. This base class ensures that the arguments are implemented in the same class, and then defers to the _subtract() method. Subclasses should override that method to perform type-specific operation.

Overrides:

subtract in class Token

Parameters:

rightArgument - The token to subtract from this token.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

subtractReverse

public Token subtractReverse(Token leftArgument)
                      throws IllegalActionException

Return a new token whose value is the value of this token subtracted from the value of the argument token. This base class ensures that the arguments are implemented in the same class, and then defers to the _subtract() method. Subclasses should override that method to perform type-specific operation.

Overrides:

subtractReverse in class Token

Parameters:

leftArgument - The token to subtract this token from.

Returns:

A new token containing the result.

Throws:

IllegalActionException - If the argument token and this token are implemented in different classes, or the operation does not make sense for the given types.

_add

protected abstract Token _add(Token rightArgument)
                       throws IllegalActionException

Return a new token whose value is the value of the argument token added to the value of this token. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for add.

Parameters:

rightArgument - The token whose value we add to the value of this token.

Returns:

A new token containing the result that is of the same class as this token.

Throws:

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

_divide

protected abstract Token _divide(Token rightArgument)
                          throws IllegalActionException

Return a new token whose value is the value of this token divided by the value of the argument token. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for divide.

Parameters:

rightArgument - The token to divide this token by.

Returns:

A new token containing the result that is of the same class as this token.

Throws:

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

_isCloseTo

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

Test that 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. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for divide.

Parameters:

rightArgument - The token with which to test closeness.

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

Returns:

A token that contains the result of the test.

Throws:

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

_isEqualTo

protected BooleanToken _isEqualTo(Token token)
                           throws IllegalActionException

Test for equality of the values of this token and the argument. This base class delegates to the equals() method.

Parameters:

token - The token to compare to this token.

Returns:

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

Throws:

IllegalActionException - Not thrown in this base class.

_modulo

protected abstract Token _modulo(Token rightArgument)
                          throws IllegalActionException

Return a new token whose value is the value of this token modulo the value of the argument token. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for modulo.

Parameters:

rightArgument - The token to modulo this token by.

Returns:

A new token containing the result that is of the same class as this token.

Throws:

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

_multiply

protected abstract Token _multiply(Token rightArgument)
                            throws IllegalActionException

Return a new token whose value is the value of this token multiplied by the value of the argument token. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for multiply.

Parameters:

rightArgument - The token to multiply this token by.

Returns:

A new token containing the result that is of the same class as this token.

Throws:

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

_subtract

protected abstract Token _subtract(Token rightArgument)
                            throws IllegalActionException

Return a new token whose value is the value of the argument token subtracted from the value of this token. It is guaranteed by the caller that the type of the argument is the same as the type of this class. This method should be overridden in derived classes to provide type specific actions for subtract.

Parameters:

rightArgument - The token to subtract from this token.

Returns:

A new token containing the result that is of the same class as this token.

Throws:

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