public Extent getExtent (Class pcClass, boolean includeSubclasses);
Extent
s
are logical representations of all
persistent instances of a given persistence-capable class, possibly
including subclasses.
Extent
s are obtained through the
PersistenceManager
's
getExtent
method. This method takes two
parameters: the class of objects the Extent
contains, and a boolean
indicating whether or
not the Extent
also contains subclass instances.
You cannot retrieve Extent
s for
persistence-capable classes whose metadata specifies a value of
false
for the requires-extent
attribute.