// /////////////////////////////////////////////////////////////////
// // private methods ////
// Recursively compute the set of free variables for all actors
// deeply contained in the given model.
private Set _freeVariables(Entity model) throws IllegalActionException {
// First get the free variables of contained actors.
Set set = new HashSet();
if (model instanceof CompositeEntity) {
for (Iterator entities = ((CompositeEntity) model).entityList().iterator();
entities.hasNext(); ) {
Entity entity = (Entity) entities.next();
set.addAll(_freeVariables(entity));
}
}
// Next, compute the set of variable names defined in this container.
Set variableNames = new HashSet();
for (Iterator variables = model.attributeList(Variable.class).iterator();
variables.hasNext(); ) {
Variable variable = (Variable) variables.next();
variableNames.add(variable.getName());
}
variableNames = Collections.unmodifiableSet(variableNames);
// Free variables of contained actors that are defined in this
// container are not free variables of this container.
set.removeAll(variableNames);
// Iterate over all the variables of this container, and add in
// any free variables they reference.
PtParser parser = new PtParser();
ParseTreeFreeVariableCollector collector = new ParseTreeFreeVariableCollector();
for (Iterator variables = model.attributeList(Variable.class).iterator();
variables.hasNext(); ) {
Variable variable = (Variable) variables.next();
String expression = variable.getExpression();
ASTPtRootNode root;
if (variable.isStringMode()) {
root = parser.generateStringParseTree(expression);
} else {
root = parser.generateParseTree(expression);
}
Set freeIdentifiers = new HashSet(collector.collectFreeVariables(root));
// Identifiers that reference other variables in the same container
// are bound, not free.
Set tempSet = new HashSet(variableNames);
tempSet.remove(variable.getName());
freeIdentifiers.removeAll(tempSet);
set.addAll(freeIdentifiers);
}
_entityToFreeVariableNameSet.put(model, set);
return set;
}
