org.grouplens.lenskit.data.snapshot

Class AbstractPreferenceSnapshot

java.lang.Object

org.grouplens.lenskit.data.snapshot.AbstractPreferenceSnapshot

All Implemented Interfaces:

Closeable, AutoCloseable, PreferenceSnapshot

Direct Known Subclasses:

PackedPreferenceSnapshot

public abstract class AbstractPreferenceSnapshot
extends Object
implements PreferenceSnapshot

Base class for implementing preference snapshots.

Field Summary

Fields

Modifier and Type	Field and Description
protected Long2ObjectMap<SparseVector>	cache The user vector cache.

Constructor Summary

Constructors

Constructor and Description
AbstractPreferenceSnapshot() Initialize the snapshot.

Method Summary

Modifier and Type	Method and Description
void	close() Close the build context.
SparseVector	userRatingVector(long userId) Get the current preferences of a particular user in SparseVector form.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.grouplens.lenskit.data.snapshot.PreferenceSnapshot

getItemIds, getRatings, getUserIds, getUserRatings, itemIndex, userIndex

Field Detail

cache

protected Long2ObjectMap<SparseVector> cache

The user vector cache.

Constructor Detail

AbstractPreferenceSnapshot

public AbstractPreferenceSnapshot()

Initialize the snapshot.

Method Detail

userRatingVector

public SparseVector userRatingVector(long userId)

Description copied from interface: PreferenceSnapshot

Get the current preferences of a particular user in SparseVector form.

Specified by:

userRatingVector in interface PreferenceSnapshot

Parameters:

userId - The user's ID.

Returns:

The user's rating vector.

close

@OverridingMethodsMustInvokeSuper
public void close()

Description copied from interface: PreferenceSnapshot

Close the build context. This overrides Closeable.close() to drop the exception that can be thrown.

After the build context has been closed, all methods are allowed to fail. Objects returned from those methods, however, should continue to be valid.

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable

Specified by:

close in interface PreferenceSnapshot