org.grouplens.lenskit.data.history

Class History

java.lang.Object

org.grouplens.lenskit.data.history.History

public final class History
extends Object

Utility methods for user histories.

Since:

1.3

Method Summary

Modifier and Type	Method and Description
static <E extends Event> ItemEventCollection<E>	forItem(long id) Create an empty history for a particular item.
static <E extends Event> ItemEventCollection<E>	forItem(long id, Iterable<? extends E> events) Create an event collection for a particular item.
static <E extends Event> UserHistory<E>	forUser(long id) Create an empty history for a particular user.
static <E extends Event> UserHistory<E>	forUser(long id, E... events) Create a history for a particular user with an array of events.
static <E extends Event> UserHistory<E>	forUser(long id, List<? extends E> events) Create a history for a particular user.

Methods inherited from class java.lang.Object

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

Method Detail

forUser

@Nonnull
public static <E extends Event> UserHistory<E> forUser(long id,
                                                                List<? extends E> events)

Create a history for a particular user.

Type Parameters:

E - The root type of the events in the history.

Parameters:

id - The user ID.

events - The events.

Returns:

A history object.

forUser

@Nonnull
public static <E extends Event> UserHistory<E> forUser(long id)

Create an empty history for a particular user.

Type Parameters:

E - The type of event in the history.

Parameters:

id - The user ID.

Returns:

An empty history for the user.

forUser

@Nonnull
public static <E extends Event> UserHistory<E> forUser(long id,
                                                                E... events)

Create a history for a particular user with an array of events.

Type Parameters:

E - The type of event in the history.

Parameters:

id - The user ID.

events - The events.

Returns:

An empty history for the user.

forItem

@Nonnull
public static <E extends Event> ItemEventCollection<E> forItem(long id,
                                                                        Iterable<? extends E> events)

Create an event collection for a particular item.

Type Parameters:

E - The root type of the events in the history.

Parameters:

id - The item ID.

events - The events.

Returns:

A history object.

forItem

@Nonnull
public static <E extends Event> ItemEventCollection<E> forItem(long id)

Create an empty history for a particular item.

Type Parameters:

E - The type of event in the history.

Parameters:

id - The item ID.

Returns:

An empty history for the item.