org.grouplens.lenskit.data.dao

Class UserListUserDAO

java.lang.Object

org.grouplens.lenskit.data.dao.UserListUserDAO

All Implemented Interfaces:

java.io.Serializable, UserDAO

@Shareable
public class UserListUserDAO
extends java.lang.Object
implements UserDAO, java.io.Serializable

A user DAO that stores a precomputed list of users.

Since:

2.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UserListUserDAO(java.util.Collection<java.lang.Long> users)

Method Summary

Modifier and Type	Method and Description
static UserListUserDAO	fromFile(java.io.File file) Read a user list DAO from a file.
LongSet	getUserIds() Get all known user IDs.

Methods inherited from class java.lang.Object

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

Constructor Detail

UserListUserDAO

public UserListUserDAO(java.util.Collection<java.lang.Long> users)

Method Detail

getUserIds

public LongSet getUserIds()

Description copied from interface: UserDAO

Get all known user IDs.

Specified by:

getUserIds in interface UserDAO

Returns:

The set of known user IDs.

fromFile

public static UserListUserDAO fromFile(java.io.File file)
                                throws java.io.IOException

Read a user list DAO from a file.

Parameters:

file - A file of user IDs, one per line.

Returns:

The user list DAO.

Throws:

java.io.IOException - if there is an error reading the list of users.