Package ptolemy.kernel.util

Class SingletonAttribute

java.lang.Object

ptolemy.kernel.util.NamedObj

ptolemy.kernel.util.Attribute

ptolemy.kernel.util.SingletonAttribute

All Implemented Interfaces:

java.lang.Cloneable, Changeable, Debuggable, DebugListener, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable, Singleton

Direct Known Subclasses:

DocAttribute, EventQueueDebugger, GeneratorAttribute, GiottoTimingManager, IDAttribute, LayoutHint, Location, MonitorReceiverAttribute, MonitorReceiverContents, NodeControllerFactory, ParserAttribute, PersistenceAttribute, UndoStackAttribute, URIAttribute

public class SingletonAttribute
extends Attribute
implements Singleton

This class is an attribute that replaces any previously existing attribute in the container that has the same name.

Since:

Ptolemy II 1.0

Version:

$Id$

Author:

Steve Neuendorffer and Edward A. Lee

Pt.AcceptedRating:

Green (janneck)

Pt.ProposedRating:

Green (eal)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.kernel.util.NamedObj

NamedObj.ContainedObjectsIterator

Field Summary

Fields inherited from class ptolemy.kernel.util.NamedObj

_changeListeners, _changeLock, _changeRequests, _debugging, _debugListeners, _deferChangeRequests, _elementName, _isPersistent, _verbose, _workspace, ATTRIBUTES, CLASSNAME, COMPLETE, CONTENTS, DEEP, FULLNAME, LINKS

Constructor Summary

Constructors

Constructor	Description
SingletonAttribute()	Construct a new attribute with no container and an empty string as its name.
SingletonAttribute(NamedObj container, java.lang.String name)	Construct an attribute with the given container and name.
SingletonAttribute(Workspace workspace)	Construct a new attribute with no container and an empty string as a name.

Method Summary

Modifier and Type	Method	Description
void	setContainer(NamedObj container)	Remove any previous attribute in the container that has the same name as this attribute, and then call the base class method to set the container.

Methods inherited from class ptolemy.kernel.util.Attribute

_checkContainer, _getContainedObject, _propagateExistence, clone, getContainer, moveDown, moveToFirst, moveToIndex, moveToLast, moveUp, setName, updateContent

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _containedDecorators, _copyChangeRequestList, _debug, _debug, _debug, _debug, _debug, _description, _executeChangeRequests, _exportMoMLContents, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _notifyHierarchyListenersAfterChange, _notifyHierarchyListenersBeforeChange, _propagateValue, _removeAttribute, _splitName, _stripNumericSuffix, _validateSettables, addChangeListener, addDebugListener, addHierarchyListener, attributeChanged, attributeDeleted, attributeList, attributeList, attributeTypeChanged, clone, containedObjectsIterator, decorators, deepContains, depthInHierarchy, description, description, event, executeChangeRequests, exportMoML, exportMoML, exportMoML, exportMoML, exportMoML, exportMoMLPlain, getAttribute, getAttribute, getAttributes, getChangeListeners, getClassName, getDecoratorAttribute, getDecoratorAttributes, getDerivedLevel, getDerivedList, getDisplayName, getElementName, getFullName, getModelErrorHandler, getName, getName, getPrototypeList, getSource, handleModelError, isDeferringChangeRequests, isOverridden, isPersistent, lazyContainedObjectsIterator, message, notifyOfNameChange, propagateExistence, propagateValue, propagateValues, removeAttribute, removeChangeListener, removeDebugListener, removeHierarchyListener, requestChange, setClassName, setDeferringChangeRequests, setDerivedLevel, setDisplayName, setModelErrorHandler, setPersistent, setSource, sortContainedObjects, toplevel, toString, uniqueName, validateSettables, workspace

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

SingletonAttribute

public SingletonAttribute()

Construct a new attribute with no container and an empty string as its name. Add the attribute to the workspace directory. Increment the version number of the workspace.

SingletonAttribute

public SingletonAttribute(Workspace workspace)

Construct a new attribute with no container and an empty string as a name. You can then change the name with setName(). If the workspace argument is null, then use the default workspace. Add the attribute to the workspace directory. Increment the version number of the workspace.

Parameters:

workspace - The workspace that will list the attribute.

SingletonAttribute

public SingletonAttribute(NamedObj container,
                          java.lang.String name)
                   throws NameDuplicationException,
                          IllegalActionException

Construct an attribute with the given container and name. If an attribute already exists with the same name as the one specified here, that is an instance of class SingletonAttribute (or a derived class), then that attribute is removed before this one is inserted in the container.

Parameters:

container - The container.

name - The name of this attribute.

Throws:

IllegalActionException - If the attribute cannot be contained by the proposed container.

NameDuplicationException - If the container already has an attribute with this name, and the class of that container is not SingletonAttribute.

Method Detail

setContainer

public void setContainer(NamedObj container)
                  throws IllegalActionException,
                         NameDuplicationException

Remove any previous attribute in the container that has the same name as this attribute, and then call the base class method to set the container. If the container is not in the same workspace as this attribute, throw an exception. If this attribute is already contained by the NamedObj, do nothing. If the attribute already has a container, remove this attribute from its attribute list first. Otherwise, remove it from the directory of the workspace, if it is there. If the argument is null, then remove this attribute from its container. It is not added to the workspace directory, so this could result in this object being garbage collected.

Note that since an Attribute is a NamedObj, it can itself have attributes. However, recursive containment is not allowed, where an attribute is an attribute of itself, or indirectly of any attribute it contains.

This method is write-synchronized on the workspace and increments its version number.

Overrides:

setContainer in class Attribute

Parameters:

container - The container to attach this attribute to.

Throws:

IllegalActionException - If this attribute is not of the expected class for the container, or it has no name, or the attribute and container are not in the same workspace, or the proposed container would result in recursive containment.

NameDuplicationException - If the container already has an attribute with the name of this attribute that is of class SingletonConfigurableAttribute.

See Also:

Attribute.getContainer()