Examples of ptolemy.actor.TypedIOPort

ptolemy.actor.TypedIOPort
An IOPort with a type. This class implements the Typeable interface. The type is represented by an instance of Type in data.type package. It can be declared by calling setTypeEquals(). If this method is not called, or called with a BaseType.UNKNOWN argument, the type of this port will be set by type resolution using the type constraints. The type constraints on this port can be specified using the methods defined in the Typeable interface.
This class keeps a list of TypeListeners. Whenever the type changes, this class will generate an instance of TypeEvent and pass it to the listeners by calling their typeChanged() method. A TypeListener register its interest in the type change event of this port by calling addTypeListener(), and can be removed from the listener list by calling the removeTypeListener().
A TypedIOPort can only link to instances of TypedIORelation. Derived classes may further constrain links to a subclass of TypedIORelation. To do this, they should override the protected methods _link() and _linkInside() to throw an exception if their arguments are not of the appropriate type. Similarly, an TypeIOPort can only be contained by a class derived from ComponentEntity and implementing the TypedActor interface. Subclasses may further constrain the containers by overriding _checkContainer().
Note that actors that call some of the setTypeXXX methods may also need to have a clone() method. Although the base classes neatly handle most aspects of the clone operation, there are subtleties involved with cloning type constraints. Absolute type constraints on ports and parameters are carried automatically into the clone, so clone() methods should never call setTypeEquals(). However, relative type constraints of the other setTypeXXX() methods are not cloned automatically because of the difficulty of ensuring that the other object being referred to in a relative constraint is the intended one.
For example the Ramp actor constructor calls:
```
 output.setTypeAtLeast(init); 
```
so the clone() method of the Ramp actor calls:
```
 newObject.output.setTypeAtLeast(newObject.init); 
```
@author Yuhong Xiong, Lukito Muliadi @version $Id: TypedIOPort.java,v 1.167 2007/12/06 21:56:14 cxh Exp $ @since Ptolemy II 0.2 @Pt.ProposedRating Green (yuhong) @Pt.AcceptedRating Yellow (neuendor)

        super.preinitialize();


        Iterator ports = outputPortList().iterator();


        while (ports.hasNext()) {
            TypedIOPort port = (TypedIOPort) ports.next();


            // Ensure that the production rate is one.
            // FIXME: This may not be right if there is no
            // actual source of data for this port (e.g. no
            // SetVariable actor).
            Variable rate = (Variable) port.getAttribute("tokenProductionRate");


            if (rate == null) {
                try {
                    rate = new Variable(port, "tokenProductionRate");
                } catch (NameDuplicationException e) {
                    throw new InternalErrorException(e);
                }
            }


            rate.setToken(new IntToken(1));


            String portName = port.getName();
            Attribute attribute = getAttribute(portName);


            if (attribute == null) {
                try {
                    workspace().getWriteAccess();
                    attribute = new Variable(this, portName);
                } catch (NameDuplicationException ex) {
                    throw new InternalErrorException(ex);
                } finally {
                    workspace().doneWriting();
                }
            }


            // attribute is now assured to be non-null.
            if (attribute instanceof Variable) {
                port.setTypeAtLeast((Variable) attribute);
            } else {
                // Assume the port type must be a string.
                port.setTypeEquals(BaseType.STRING);
            }
        }
    }

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    public EventSource(CompositeEntity container, String name)
            throws IllegalActionException, NameDuplicationException {
        super(container, name);


        // Create port and parameters.
        output = new TypedIOPort(this, "output", false, true);
        new Parameter(output, "signalType", new StringToken("DISCRETE"));


        period = new Parameter(this, "period");
        period.setExpression("2.0");
        period.setTypeEquals(BaseType.DOUBLE);

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    public DatagramReader(CompositeEntity container, String name)
            throws NameDuplicationException, IllegalActionException {
        super(container, name);


        // ports - Ordering here sets the order they show up in Vergil
        returnAddress = new TypedIOPort(this, "returnAddress");
        returnAddress.setTypeEquals(BaseType.STRING);
        returnAddress.setOutput(true);


        returnSocketNumber = new TypedIOPort(this, "returnSocketNumber");
        returnSocketNumber.setTypeEquals(BaseType.INT);
        returnSocketNumber.setOutput(true);


        output = new TypedIOPort(this, "output");
        output.setTypeEquals(new ArrayType(BaseType.UNSIGNED_BYTE));
        output.setOutput(true);


        trigger = new TypedIOPort(this, "trigger", true, false);
        trigger.setTypeEquals(BaseType.GENERAL);
        trigger.setMultiport(true);


        // parameters - Ordering here sets the order they show up in Vergil
        localSocketNumber = new Parameter(this, "localSocketNumber");

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     *   actor with this name.
     */
    public BusAssembler(CompositeEntity container, String name)
            throws NameDuplicationException, IllegalActionException {
        super(container, name);
        output = new TypedIOPort(this, "output", false, true);
        output.setMultiport(true);
        _attachText("_iconDescription", "<svg>\n"
                + "<rect x=\"0\" y=\"0\" width=\"6\" "
                + "height=\"40\" style=\"fill:black\"/>\n" + "</svg>\n");
    }

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     *  throws it.
     */
    public void fire() throws IllegalActionException {
        super.fire();
        Iterator inputPorts = inputPortList().iterator();
        TypedIOPort inputPort = (TypedIOPort) (inputPorts.hasNext() ? inputPorts
                .next()
                : null);
        int inputWidth = (inputPort != null) ? inputPort.getWidth() : 0;
        int i = 0;
        int j = 0;


        while (inputPort != null) {
            if ((i < inputWidth) && inputPort.hasToken(i)) {
                Token t = inputPort.get(i);


                if (j < _outputWidth) {
                    output.send(j, t);
                }
            }


            j++;


            if (++i >= inputWidth) {
                inputPort = (TypedIOPort) (inputPorts.hasNext() ? inputPorts
                        .next() : null);
                inputWidth = (inputPort != null) ? inputPort.getWidth() : 0;
                i = 0;
            }
        }
    }

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        TypedIORelation outputRelation = (TypedIORelation) outputRelations
                .get(0);
        Iterator inputPorts = inputPortList().iterator();


        while (inputPorts.hasNext()) {
            TypedIOPort port = (TypedIOPort) inputPorts.next();
            _outputWidth += port.getWidth(); // includes all linked relations
        }


        outputRelation.setWidth(_outputWidth);


        // TODO: figure out how to obey if the output relation width is

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     *   an entity already in the container.
     */
    public FirstOrderHold(CompositeEntity container, String name)
            throws IllegalActionException, NameDuplicationException {
        super(container, name);
        derivative = new TypedIOPort(this, "derivative", true, false);
        defaultValue = new Parameter(this, "defaultValue");
        defaultValue.setExpression("0.0");
        defaultDerivative = new Parameter(this, "defaultDerivative");
        defaultDerivative.setExpression("0.0");

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     *   actor with this name.
     */
    public BusDisassembler(CompositeEntity container, String name)
            throws NameDuplicationException, IllegalActionException {
        super(container, name);
        input = new TypedIOPort(this, "input", true, false);
        input.setMultiport(true);
        _attachText("_iconDescription", "<svg>\n"
                + "<rect x=\"0\" y=\"0\" width=\"6\" "
                + "height=\"40\" style=\"fill:black\"/>\n" + "</svg>\n");
    }

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    ////                         public methods                    ////
    public void fire() throws IllegalActionException {
        super.fire();
        int inputWidth = input.getWidth();
        Iterator outputPorts = outputPortList().iterator();
        TypedIOPort outputPort = (TypedIOPort) (outputPorts.hasNext() ? outputPorts
                .next()
                : null);
        int outputWidth = (outputPort != null) ? outputPort.getWidth() : 0;
        int j = 0;


        for (int i = 0; i < inputWidth; i++) {
            if (input.hasToken(i)) {
                Token t = input.get(i);


                if (outputPort != null) {
                    outputPort.send(j, t);
                }
            }


            if (outputPort != null) {
                if (j < (outputWidth - 1)) {
                    j++;
                } else {
                    outputPort = (TypedIOPort) (outputPorts.hasNext() ? outputPorts
                            .next()
                            : null);
                    outputWidth = (outputPort != null) ? outputPort.getWidth()
                            : 0;
                    j = 0;
                }
            }
        }

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        input.setMultiport(true);
        new Parameter(input, "signalType", new StringToken("CONTINUOUS"));
        output.setMultiport(true);
        output.setTypeAtLeast(input);
        new Parameter(output, "signalType", new StringToken("DISCRETE"));
        trigger = new TypedIOPort(this, "trigger", true, false);
        trigger.setMultiport(false);
        new Parameter(trigger, "signalType", new StringToken("DISCRETE"));


        // The trigger input has a generic type.
        _attachText("_iconDescription", "<svg>\n"

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ptolemy.actor.lib.Expression$VariableScope

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