org.grouplens.lenskit.util

Class Indexer

java.lang.Object

org.grouplens.lenskit.util.Indexer

All Implemented Interfaces:

Serializable, Index

Deprecated.

Use MutableIdIndexMapping instead.

@Deprecated
public class Indexer
extends Object
implements Index

Build contiguous 0-based indexes for long IDs.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Indexer() Deprecated. Construct a new empty indexer.

Method Summary

Modifier and Type	Method and Description
MutableSparseVector	convertArrayToVector(double[] values) Deprecated. This method is used to convert arrays to sparse arrays.
long	getId(int idx) Deprecated. Get the id for an index.
LongList	getIds() Deprecated. Get the list of IDs.
int	getIndex(long id) Deprecated. Get the index of an id.
int	getObjectCount() Deprecated. Get the number of IDs in the index.
int	internId(long id) Deprecated. Get an index for an ID, generating a new one if necessary.

Methods inherited from class java.lang.Object

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

Constructor Detail

Indexer

public Indexer()

Deprecated.

Construct a new empty indexer. The first interned ID will have index 0.

Method Detail

getId

public long getId(int idx)

Deprecated.

Description copied from interface: Index

Get the id for an index.

Specified by:

getId in interface Index

Parameters:

idx - The index of the ID to retrieve.

Returns:

The ID for the given idx.

getIds

public LongList getIds()

Deprecated.

Description copied from interface: Index

Get the list of IDs.

Specified by:

getIds in interface Index

Returns:

The list of (unique) IDs in the index.

getIndex

public int getIndex(long id)

Deprecated.

Description copied from interface: Index

Get the index of an id. If the id is not in the index, returns a negative number.

Specified by:

getIndex in interface Index

Parameters:

id - The id to query.

Returns:

The id's index or a negative value if the id does not exist.

getObjectCount

public int getObjectCount()

Deprecated.

Description copied from interface: Index

Get the number of IDs in the index.

Specified by:

getObjectCount in interface Index

Returns:

The number of indexed ids.

internId

public int internId(long id)

Deprecated.

Get an index for an ID, generating a new one if necessary.

Parameters:

id - The ID.

Returns:

The index for id. If the ID has already been interned, the old index is returned; otherwise, a new index is generated and returned.

convertArrayToVector

public MutableSparseVector convertArrayToVector(double[] values)

Deprecated.

Description copied from interface: Index

This method is used to convert arrays to sparse arrays. It takes an array of `double` values corresponding to the ids interned in the index and converts it to a sparse vector whose keys are the IDs.

Specified by:

convertArrayToVector in interface Index

Parameters:

values - A array of double value.

Returns:

A new sparse vector that is converted from the Array.