org.eclipse.emf.cdo.spi.common.model
Interface InternalCDOClassInfo.PersistenceFilter

Enclosing interface:

InternalCDOClassInfo

public static interface InternalCDOClassInfo.PersistenceFilter

Encapsulation of a rule for filtering the persistent values of a feature in some model element. Some models (such as UML's Activity metaclass) require partial persistence of features, persisting a subset of the values in a feature that are also in some other feature (the filtering feature). Other models may apply other transformations to features that require partial or otherwise custom persistence rules.

getPersistableValue

Object getPersistableValue(EObject owner,
                           Object value)

Get a subset or other transformation of the specified value of a persistable feature, based on its dependencies.

Parameters:

owner - an object this filter is to be applied to.

value - the value (which may be a collection) of the owner's feature.

Returns:

the transformed value to persist. It should be a collection (possibly empty) if the value is a collection, or a scalar (possibly null) if the value is a scalar