ptolemy.data

Class ActorToken

java.lang.Object

ptolemy.data.Token

ptolemy.data.ActorToken

All Implemented Interfaces:

java.lang.Cloneable

public class ActorToken
extends Token
implements java.lang.Cloneable

A token that contains an actor. This token allows components to be moved around in a model. One subtlety is that actors are not, generally immutable objects. In order to prevent the actor transmitted from appearing in multiple places in a model, and the semantic fuzziness that would result, the actor is always cloned when being retrieved from this token.

Since:

Ptolemy II 4.0

Version:

$Id$

Author:

Steve Neuendorffer

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Red (cxh)

Field Summary

Fields

Modifier and Type	Field and Description
static ActorToken	EMPTY Empty Entity instance of this token.
static Type	TYPE Singleton reference to this type.

Fields inherited from class ptolemy.data.Token

NIL

Constructor Summary

Constructors

Constructor and Description
ActorToken(Entity entity) Construct an ActorToken.

Method Summary

Modifier and Type	Method and Description
Entity	getEntity() Return a clone of the entity contained by this token.
Entity	getEntity(Workspace workspace) Return a clone of the entity contained by this token.
void	getMoML(java.io.Writer output) Output the MoML of the enclosed entity to the given writer.
Type	getType() Return the type of this token.
BooleanToken	isCloseTo(Token rightArgument, double epsilon) Test for closeness of the values of this Token and the argument Token.
BooleanToken	isEqualTo(Token token) Model for equality of the values of this Token and the argument Token.
java.lang.String	toString() Return the value of this token as a string that can be parsed by the expression language to recover a token with the same value.

Methods inherited from class ptolemy.data.Token

add, addReverse, divide, divideReverse, isCloseTo, isNil, modulo, moduloReverse, multiply, multiplyReverse, notSupportedConversionMessage, notSupportedIncomparableConversionMessage, notSupportedIncomparableMessage, notSupportedMessage, notSupportedNullNilStringMessage, one, pow, subtract, subtractReverse, zero, zeroReturnType

Methods inherited from class java.lang.Object

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

Field Detail

EMPTY

public static final ActorToken EMPTY

Empty Entity instance of this token.

TYPE

public static final Type TYPE

Singleton reference to this type.

Constructor Detail

ActorToken

public ActorToken(Entity entity)
           throws IllegalActionException

Construct an ActorToken.

Parameters:

entity - The entity that this Token contains.

Throws:

IllegalActionException - If cloning the entity fails.

Method Detail

getEntity

public Entity getEntity()

Return a clone of the entity contained by this token.

Returns:

The clone of the entity.

getEntity

public Entity getEntity(Workspace workspace)

Return a clone of the entity contained by this token.

Parameters:

workspace - The workspace that the returned entity is in.

Returns:

The clone of the entity.

getMoML

public void getMoML(java.io.Writer output)
             throws java.io.IOException

Output the MoML of the enclosed entity to the given writer.

Parameters:

output - The writer to which the MoML is output.

Throws:

java.io.IOException - If an I/O error occurs.

getType

public Type getType()

Return the type of this token.

Overrides:

getType in class Token

Returns:

the type of this token.

isCloseTo

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

Test for closeness of the values of this Token and the argument Token. For actor tokens, checking for closeness is the same as checking for equality.

Overrides:

isCloseTo in class Token

Parameters:

rightArgument - The token to compare to this token.

epsilon - This argument is ignored in this method.

Returns:

A true-valued token if the first argument is equal to this token.

Throws:

IllegalActionException - If thrown by isEqualTo(Token).

isEqualTo

public BooleanToken isEqualTo(Token token)
                       throws IllegalActionException

Model for equality of the values of this Token and the argument Token. It should be overridden in derived classes to provide type specific actions for equality testing.

Overrides:

isEqualTo in class Token

Parameters:

token - The token with which to test equality.

Returns:

A BooleanToken which contains the result of the test.

Throws:

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

toString

public java.lang.String toString()

Return the value of this token as a string that can be parsed by the expression language to recover a token with the same value. This method returns a string of the form `parseMoML("text")', where text is a MoML description of this actor with quotation marks and backslashes escaped.

Overrides:

toString in class Token

Returns:

A MoML description of this actor.