eUnset

eUnset is a method in the Eclipse Modeling Framework (EMF) that unsets a feature of an EObject. In EMF, modeled data is accessed through EObjects, which support generic access via eGet, eSet, eIsSet, and eUnset in addition to type-safe accessors generated from the model. The eUnset operation removes the value of a feature or marks it as not set, depending on the feature's characteristics, and is used in reflective tooling and in generated code.

The method has two common forms: eUnset(int featureID) and eUnset(EStructuralFeature feature). The implementation is generated for each feature; for multi-valued features (lists), eUnset clears the collection. For single-valued features marked as unsettable, eUnset marks the feature as not set and resets its value accordingly so that eIsSet(feature) returns false. If a feature is not unsettable, the behavior is defined by the model and typically results in resetting to a default value or may be a no-op.

eUnset participates in change notification and persistence. Calling eUnset usually fires a notification to registered adapters and affects serialization; an unset feature is typically omitted from serialized output unless a default value is used.

See also: eGet, eSet, eIsSet, EObject, EStructuralFeature, unsettable, Ecore.