org.grouplens.lenskit.data.dao

Class EventCollectionDAO.Factory

java.lang.Object

org.grouplens.lenskit.data.dao.EventCollectionDAO.Factory

All Implemented Interfaces:

DAOFactory

Enclosing class:

EventCollectionDAO

@ThreadSafe
public static class EventCollectionDAO.Factory
extends Object
implements DAOFactory

Factory for creating event collection DAOs. It assumes that the collection is not modified by other code, so a singleton DAO is created and returned for both create() and snapshot().

Author:

GroupLens Research

Constructor Summary

Constructors

Constructor and Description
EventCollectionDAO.Factory(Collection<? extends Event> ratings) Construct a new factory.

Method Summary

Methods

Modifier and Type	Method and Description
EventCollectionDAO	create() Create a new DAO.
EventCollectionDAO	snapshot() Create a snapshot DAO.
static EventCollectionDAO.Factory	wrap(DAOFactory base) Wrap another factory by reading its event list.

Methods inherited from class java.lang.Object

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

Constructor Detail

EventCollectionDAO.Factory

public EventCollectionDAO.Factory(Collection<? extends Event> ratings)

Construct a new factory.

Parameters:

ratings - The event collection.

Method Detail

create

public EventCollectionDAO create()

Description copied from interface: DAOFactory

Create a new DAO.

Specified by:

create in interface DAOFactory

Returns:

A new DAO. The caller is responsible for closing it.

snapshot

public EventCollectionDAO snapshot()

Description copied from interface: DAOFactory

Create a snapshot DAO. Snapshot DAOs provide access to an immutable snapshot of data for use in recommender training/building. LenskitRecommenderEngineFactory uses a snapshot DAO in to build recommenders, and a normal DAO to create sessions.

Specified by:

snapshot in interface DAOFactory

Returns:

A snapshotted DAO. The caller is responsible for closing it.

wrap

public static EventCollectionDAO.Factory wrap(DAOFactory base)

Wrap another factory by reading its event list.

Parameters:

base - The underlying factory.

Returns:

A factory built from the events in .