Package ptolemy.data.expr

Class TemporaryVariable

java.lang.Object

ptolemy.kernel.util.NamedObj

ptolemy.kernel.util.Attribute

ptolemy.kernel.util.AbstractSettableAttribute

ptolemy.data.expr.Variable

ptolemy.data.expr.TemporaryVariable

All Implemented Interfaces:

java.lang.Cloneable, HasTypeConstraints, Typeable, Changeable, Debuggable, DebugListener, Derivable, ModelErrorHandler, MoMLExportable, Moveable, Nameable, Settable, ValueListener

public class TemporaryVariable
extends Variable

This is identical to a Variable except that creating it does not increment the workspace version. It should be used to create a variable to store information and make that information visible to the user, but where the presence of this variable has no bearing on type resolution, scheduling, model structure, or any other property of the model that might invalidate cached information. This variable should be used with caution, but use of this variable can significantly improve performance since it makes caching of information that is expensive to compute much more effective.

Since:

Ptolemy II 5.2

Version:

$Id$

Author:

Edward A. Lee

Pt.AcceptedRating:

Red (cxh)

Pt.ProposedRating:

Green (eal)

Nested Class Summary

Nested classes/interfaces inherited from class ptolemy.data.expr.Variable

Variable.CircularDependencyError, Variable.VariableScope

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

NamedObj.ContainedObjectsIterator

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

Settable.Visibility

Field Summary

Fields inherited from class ptolemy.data.expr.Variable

_currentExpression, _needsEvaluation, _parserScope, _parseTreeValid, _suppressVariableSubstitution, _valueListeners

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

Fields inherited from interface ptolemy.kernel.util.Settable

EXPERT, FULL, NONE, NOT_EDITABLE

Constructor Summary

Constructors

Constructor	Description
TemporaryVariable(NamedObj container, java.lang.String name)	Construct a variable with the given name as an attribute of the given container.

Method Summary

Methods inherited from class ptolemy.data.expr.Variable

_description, _evaluate, _getCurrentExpression, _notifyValueListeners, _parseIfNecessary, _propagate, _propagateToValueListeners, _propagateValue, _setToken, _setTokenAndNotify, addValueListener, attributeChanged, clone, getDeclaredType, getExpression, getFreeIdentifiers, getParserScope, getScope, getScope, getToken, getType, getTypeTerm, getValueAsString, getVariable, getVisibility, invalidate, isKnown, isLazy, isStringMode, isSuppressVariableSubstitution, isTypeAcceptable, removeValueListener, reset, setContainer, setExpression, setLazy, setName, setParseTreeEvaluator, setStringMode, setSuppressVariableSubstitution, setToken, setToken, setTypeAtLeast, setTypeAtLeast, setTypeAtMost, setTypeEquals, setTypeSameAs, setUnknown, setValueListenerAsWeakDependency, setVisibility, stringRepresentation, toString, typeConstraintList, typeConstraints, validate, valueChanged

Methods inherited from class ptolemy.kernel.util.AbstractSettableAttribute

getDefaultExpression

Methods inherited from class ptolemy.kernel.util.Attribute

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

Methods inherited from class ptolemy.kernel.util.NamedObj

_addAttribute, _adjustOverride, _attachText, _cloneFixAttributeFields, _containedDecorators, _copyChangeRequestList, _debug, _debug, _debug, _debug, _debug, _executeChangeRequests, _exportMoMLContents, _getIndentPrefix, _isMoMLSuppressed, _markContentsDerived, _notifyHierarchyListenersAfterChange, _notifyHierarchyListenersBeforeChange, _removeAttribute, _splitName, _stripNumericSuffix, _validateSettables, addChangeListener, addDebugListener, addHierarchyListener, 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, uniqueName, validateSettables, workspace

Methods inherited from class java.lang.Object

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

Methods inherited from interface ptolemy.kernel.util.Nameable

description, getContainer, getFullName, getName, getName

Methods inherited from interface ptolemy.kernel.util.Settable

getDisplayName

Constructor Detail

TemporaryVariable

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

Construct a variable with the given name as an attribute of the given container. The container argument must not be null, otherwise a NullPointerException will be thrown. This variable will use the workspace of the container for synchronization and version counts, but creation of this variable will not increment the version number of that workspace. If the name argument is null, then the name is set to the empty string.

Parameters:

container - The container.

name - The name of the variable.

Throws:

IllegalActionException - If the container does not accept a variable as its attribute.

NameDuplicationException - If the name coincides with a variable already in the container.