org.grouplens.lenskit.data.dao

Class ItemListItemDAO

java.lang.Object

org.grouplens.lenskit.data.dao.ItemListItemDAO

All Implemented Interfaces:

Serializable, ItemDAO

@Shareable
public class ItemListItemDAO
extends Object
implements ItemDAO, Serializable

An item DAO that stores a precomputed list of items.

Since:

2.1

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
ItemListItemDAO(Collection<Long> items)

Method Summary

Modifier and Type	Method and Description
static ItemListItemDAO	fromFile(File file) Read an item list DAO from a file.
LongSet	getItemIds() Get all known item IDs.

Methods inherited from class java.lang.Object

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

Constructor Detail

ItemListItemDAO

public ItemListItemDAO(Collection<Long> items)

Method Detail

getItemIds

public LongSet getItemIds()

Description copied from interface: ItemDAO

Get all known item IDs.

Specified by:

getItemIds in interface ItemDAO

Returns:

The set of known item IDs.

fromFile

public static ItemListItemDAO fromFile(File file)
                                throws IOException

Read an item list DAO from a file.

Parameters:

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

Returns:

The item list DAO.

Throws:

IOException - if there is an error reading the list of items.