ptolemy.actor.util

Class FreeVariableModelAnalysis

java.lang.Object

ptolemy.actor.util.FreeVariableModelAnalysis

public class FreeVariableModelAnalysis
extends java.lang.Object

An analysis that traverses a model to determine all the free variables in a hierarchical model. The free variables in a model are defined to be the set of identifiers that are referenced by the model, but are not defined in the model. The free variables must be assigned values for the model to be executable. This class traverses the model, but it not read synchronized on the model, therefore its caller should be.

Since:

Ptolemy II 4.0

Version:

$Id$

Author:

Stephen Neuendorffer

Pt.AcceptedRating:

Yellow (neuendor)

Pt.ProposedRating:

Yellow (neuendor)

Constructor Summary

Constructors

Constructor and Description
FreeVariableModelAnalysis(Entity model) Analyze the given model to return a set of names which must be defined externally for the model to be completely specified.

Method Summary

Modifier and Type	Method and Description
java.util.Set	getFreeVariables(Entity entity) Return the computed free variables for the given entity.

Methods inherited from class java.lang.Object

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

Constructor Detail

FreeVariableModelAnalysis

public FreeVariableModelAnalysis(Entity model)
                          throws IllegalActionException

Analyze the given model to return a set of names which must be defined externally for the model to be completely specified. In addition, store the intermediate results for contained actors so they can be retrieved by the getFreeVariables() method.

Parameters:

model - The model that will be analyzed.

Throws:

IllegalActionException - If an exception occurs during analysis.

Method Detail

getFreeVariables

public java.util.Set getFreeVariables(Entity entity)

Return the computed free variables for the given entity.

Parameters:

entity - An entity, which must be deeply contained by the model for which this analysis was created.

Returns:

The computed free variables for the given entity.

Throws:

java.lang.RuntimeException - If the free variables for the entity have not already been computed.