Examples of ptolemy.kernel.Relation

ptolemy.kernel.Relation
A Relation links ports, and therefore the entities that contain them. To link a port to a relation, use the link() method in the Port class. To remove a link, use the unlink() method in the Port class.
Relations can also be linked to other Relations. To create such a link, use the link() method of this class. To remove such a link, use the unlink() method. A group of linked relations behaves exactly as if it were one relation directly linked to all the ports linked to by each relation. In particular, the connectedPortList() method of the Port class returns the same list whether a single relation is used or a relation group. The order in which the ports are listed is the order in which links were made between the port and relations in the relation group. It is not relevant which relation in a relation group the port links to.
Derived classes may wish to disallow links under certain circumstances, for example if the proposed port is not an instance of an appropriate subclass of Port, or if the relation cannot support any more links. Such derived classes should override the protected method _checkPort() or _checkRelation() to throw an exception. @author Edward A. Lee, Neil Smyth @version $Id: Relation.java,v 1.141 2005/11/22 23:33:29 eal Exp $ @since Ptolemy II 0.2 @Pt.ProposedRating Green (eal) @Pt.AcceptedRating Green (acataldo) @see Port @see Entity

                // a ConcurrentModificationException.
                HashMap clonedMap = (HashMap) (_localReceiversTable.clone());
                Iterator relations = clonedMap.keySet().iterator();


                while (relations.hasNext()) {
                    Relation relation = (Relation) relations.next();


                    if (!isInsideLinked(relation)) {
                        _removeReceivers(relation);
                        _localReceiversTable.remove(relation);
                        _localReceiversVersion = -1;

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                // a ConcurrentModificationException.
                HashMap clonedMap = (HashMap) (_localReceiversTable.clone());
                Iterator relations = clonedMap.keySet().iterator();


                while (relations.hasNext()) {
                    Relation relation = (Relation) relations.next();


                    if (isInsideLinked(relation)) {
                        _removeReceivers(relation);
                        _localReceiversTable.remove(relation);
                        _localReceiversVersion = -1;

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    public void unlinkInside(int index) {
        // Override the base class to update _localReceiversTable.
        try {
            _workspace.getWriteAccess();


            Relation toDelete = (Relation) _insideLinks.get(index);


            if (toDelete != null) {
                if (_localReceiversTable != null) {
                    _removeReceivers(toDelete);
                    _localReceiversTable.remove(toDelete);

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