ScopeExtender

All Known Implementing Classes:

ParameterSet, PtolemyPreferences, ScopeExtendingAttribute, UnitSystem
```
public interface ScopeExtender
```
An interface for attributes that extend their container's scope. Any parameter contained by an attribute implementing this interface has the same visibility as parameters of the container of the attribute.

Since:

Ptolemy II 10.0

Version:

$Id$, $Id$

Author:

Xiaojun Liu

See Also:

Variable

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`java.util.List`	`attributeList()`	Return a list of the attributes contained by this object.
`void`	`expand()`	Expand the scope of the container by creating any required parameters.
`Attribute`	`getAttribute(java.lang.String name)`	Get the attribute with the given name.
`void`	`validate()`	Evaluate the expressions of all the parameters of the scope extender.

- Method Detail
  - attributeList
```
java.util.List attributeList()
```
    Return a list of the attributes contained by this object. If there are no attributes, return an empty list. This method is read-synchronized on the workspace.
    
    Returns:
    
    An unmodifiable list of instances of Attribute.
  - expand
```
void expand()
     throws IllegalActionException
```
    Expand the scope of the container by creating any required parameters. This should set the expressions of the parameters, but not evaluate them (not call validate().
    
    Throws:
    
    IllegalActionException - If any required attribute cannot be created.
  - getAttribute
```
Attribute getAttribute(java.lang.String name)
```
    Get the attribute with the given name. The name may be compound, with fields separated by periods, in which case the attribute returned is contained by a (deeply) contained attribute.
    
    Parameters:
    
    name - The name of the desired attribute.
    
    Returns:
    
    The requested attribute if it is found, null otherwise.
  - validate
```
void validate()
       throws IllegalActionException
```
    Evaluate the expressions of all the parameters of the scope extender.
    
    Throws:
    
    IllegalActionException - If any required attribute cannot be created.