Package org.grouplens.lenskit.indexes

Indexes mapping between objects or IDs and integers.

See: Description

Class Summary

Class	Description
IdIndexMapping	Bidirectional mapping between long IDs and consecutive, 0-based integer indexes.
IdIndexMappingBuilder	Builder for read-only indexes.
MutableIdIndexMapping	Mutable index mapping.

Package org.grouplens.lenskit.indexes Description

Indexes mapping between objects or IDs and integers.

The classes in this package provide object indexing capabilities. There are times when code needs to use some dense, indexed data structure (e.g. an array or matrix) to store data about sparse ids or objects. An IdIndexMapping provides a bidirectional mapping between long IDs and contiguous, 0-based integers for this purpose.