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

                // Create the appropriate links.
                MultiCompositeActor container = (MultiCompositeActor) getContainer();


                if (container != null) {
                    String relationName = name + "Relation";
                    Relation relation = container.getRelation(relationName);


                    if (relation == null) {
                        relation = container.newRelation(relationName);


                        Port containerPort = container.getPort(name);

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                        }
                    }
                }


                // Rename the corresponding relation.
                Relation relation = container.getRelation(oldName + "Relation");


                if (relation != null) {
                    relation.setName(name + "Relation");
                }
            }
        } finally {
            _workspace.doneWriting();
        }

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        //_fBack2.delay.setToken(new DoubleToken(4.5));
        _fBack1.delay.setToken(new DoubleToken(1.0));
        _fBack2.delay.setToken(new DoubleToken(1.0));


        // Set up ports, relations and connections
        Relation clkRelation = toplevel.connect(_clock.output, _join1.input);
        _join2.input.link(clkRelation);


        toplevel.connect(_join1.output, _fork1.input);
        toplevel.connect(_fork1.output1, _rcvr1.input);
        toplevel.connect(_fork1.output2, _fBack1.input);

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        }


        Iterator relations = _model.relationList().iterator();


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


            if (relationDeletes != null) {
                moml.append("<relation name=\"" + relation.getName() + "\">"
                        + relationDeletes + "\"/></relation>");
            }
        }


        if (moml.length() > 0) {

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            return;
        }
        // Unlink to all previous relations, if any.
        Iterator relations = _relations.iterator();
        while (relations.hasNext()) {
            Relation relation = (Relation) relations.next();
            input.unlink(relation);
        }
        _relations.clear();


        // Link to all matching publishers.

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        PSDFDirector director = (PSDFDirector) getContainer();
        CompositeActor model = (CompositeActor) director.getContainer();
        Iterator relations = model.relationList().iterator();


        while (relations.hasNext()) {
            Relation relation = (Relation) relations.next();
            Variable variable = (Variable) relation.getAttribute("bufferSize");
            result.append(relation.getName() + ": ");


            if (variable == null) {
                result.append("null");
            } else {
                result.append(variable.getExpression());

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            _debug("The buffer size map:\n");


            Iterator relations = _bufferSizeMap.keySet().iterator();


            while (relations.hasNext()) {
                Relation relation = (Relation) relations.next();
                _debug(relation.getName() + ": " + _bufferSizeMap.get(relation)
                        + "\n");
            }
        }


        _saveBufferSizes(_bufferSizeMap);

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                                + "\nA dump of the offending edge follows.\n"
                                + nextEdge + "\n");
                    }


                    Iterator relations = relationList.iterator();
                    Relation relation = (Relation) relations.next();
                    String produced = strategy.producedExpression(nextEdge);
                    String consumed = strategy.consumedExpression(nextEdge);
                    String bufferSizeExpression = "((" + produced + ") * ("
                            + consumed + ")) / "
                            + PSDFGraphs.gcdExpression(produced, consumed);


                    // Due to the bottom-up traversal in _expandAPGAN,
                    // relations that are linked to multiple sink
                    // nodes will have their buffer sizes
                    // progressively replaced by those of outer
                    // clusterings, and will end up with the buffer
                    // size determined by the outermost clustering.
                    _debug("Associating buffer size expression '"
                            + bufferSizeExpression + "' with relation '"
                            + relation.getName() + "'\n");
                    _bufferSizeMap.put(relation, bufferSizeExpression);
                }


                return symbolicSchedule;
            }

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        ChangeRequest request = new ChangeRequest(this, "Record buffer sizes") {
            protected void _execute() throws KernelException {
                Iterator relations = container.relationList().iterator();


                while (relations.hasNext()) {
                    Relation relation = (Relation) relations.next();
                    Object bufferSizeObject = minimumBufferSizes.get(relation);


                    if (bufferSizeObject instanceof Integer) {
                        int bufferSize = ((Integer) bufferSizeObject)
                                .intValue();
                        DFUtilities.setOrCreate(relation, "bufferSize",
                                bufferSize);


                        if (_debugging) {
                            _debug("Adding bufferSize parameter to "
                                    + relation.getName() + " with value "
                                    + bufferSize);
                        }
                    } else if (bufferSizeObject instanceof String) {
                        String bufferSizeExpression = (String) bufferSizeObject;
                        DFUtilities.setOrCreate(relation, "bufferSize", "\""
                                + bufferSizeExpression + "\"");


                        if (_debugging) {
                            _debug("Adding bufferSize parameter to "
                                    + relation.getName() + " with expression "
                                    + bufferSizeExpression);
                        }
                    } else if (bufferSizeObject == null) {
                    } else {
                        throw new InternalErrorException(

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            // Collect constraints from all transitions.
            Iterator transitionRelations = relationList().iterator();


            while (transitionRelations.hasNext()) {
                Relation tr = (Relation) transitionRelations.next();
                attributes = tr.attributeList(HasTypeConstraints.class)
                        .iterator();


                while (attributes.hasNext()) {
                    HasTypeConstraints typeableAttribute = (HasTypeConstraints) attributes
                            .next();

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