ptolemy.actor.gt

Interface ValueIterator

All Superinterfaces:

Nameable, Settable

All Known Implementing Classes:

IterativeParameter

public interface ValueIterator
extends Settable

An interface for parameters whose accepted values can be iterated from the initial value with the next method.

Since:

Ptolemy II 8.0

Version:

$Id$

Author:

Thomas Huining Feng

Pt.AcceptedRating:

Red (tfeng)

Pt.ProposedRating:

Yellow (tfeng)

Nested Class Summary

Nested classes/interfaces inherited from interface ptolemy.kernel.util.Settable

Settable.Visibility

Field Summary

Fields inherited from interface ptolemy.kernel.util.Settable

EXPERT, FULL, NONE, NOT_EDITABLE

Method Summary

Modifier and Type	Method and Description
Token	getToken() Get the current value of the parameter that implements this interface.
Token	initial() Set the parameter that implements this interface with its initial value, and return that value.
Token	next() Set the parameter that implements this interface with its next value, and return that value.
void	setToken(Token token) Set the value of the parameter that implements this interface.

Methods inherited from interface ptolemy.kernel.util.Settable

addValueListener, getDefaultExpression, getDisplayName, getExpression, getValueAsString, getVisibility, removeValueListener, setExpression, setVisibility, validate

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getFullName, getName, getName, setName

Method Detail

getToken

Token getToken()
        throws IllegalActionException

Get the current value of the parameter that implements this interface.

Returns:

The current value.

Throws:

IllegalActionException - Throws if the current value cannot be obtained.

See Also:

setToken(Token)

initial

Token initial()
       throws IllegalActionException

Set the parameter that implements this interface with its initial value, and return that value.

Returns:

The initial value.

Throws:

IllegalActionException - Thrown when trying to compute the initial value or to set the parameter with that value.

next

Token next()
    throws IllegalActionException

Set the parameter that implements this interface with its next value, and return that value. If the initial value has not been set with initial(), or no next value exists, IllegalActionException is thrown.

Returns:

The next value, or null.

Throws:

IllegalActionException - Thrown when trying to compute the next value or to set the parameter with that value, or if the initial value has not been set, or no next value exists.

setToken

void setToken(Token token)
       throws IllegalActionException

Set the value of the parameter that implements this interface. This method should be used with care because the value may not be one of the values that can be obtained by repeatedly calling the next() method starting from the initial value.

Parameters:

token - The value to be set.

Throws:

IllegalActionException - Thrown when trying to set the value.

See Also:

getToken()