org.apache.mahout.cf.taste.impl.recommender.svd

Class FilePersistenceStrategy

java.lang.Object

org.apache.mahout.cf.taste.impl.recommender.svd.FilePersistenceStrategy

All Implemented Interfaces:

PersistenceStrategy

public class FilePersistenceStrategy
extends Object
implements PersistenceStrategy

Provides a file-based persistent store.

Constructor Summary

Constructors

Constructor and Description
FilePersistenceStrategy(File file)

Method Summary

Modifier and Type	Method and Description
Factorization	load() Load a factorization from a persistent store.
void	maybePersist(Factorization factorization) Write a factorization to a persistent store unless it already contains an identical factorization.
static Factorization	readBinary(DataInput in)
protected static void	writeBinary(Factorization factorization, DataOutput out)

Methods inherited from class java.lang.Object

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

Constructor Detail

FilePersistenceStrategy

public FilePersistenceStrategy(File file)

Parameters:

file - the file to use for storage. If the file does not exist it will be created when required.

Method Detail

load

public Factorization load()
                   throws IOException

Description copied from interface: PersistenceStrategy

Load a factorization from a persistent store.

Specified by:

load in interface PersistenceStrategy

Returns:

a Factorization or null if the persistent store is empty.

Throws:

IOException

maybePersist

public void maybePersist(Factorization factorization)
                  throws IOException

Description copied from interface: PersistenceStrategy

Write a factorization to a persistent store unless it already contains an identical factorization.

Specified by:

maybePersist in interface PersistenceStrategy

Throws:

IOException

writeBinary

protected static void writeBinary(Factorization factorization,
                                  DataOutput out)
                           throws IOException

Throws:

IOException

readBinary

public static Factorization readBinary(DataInput in)
                                throws IOException

Throws:

IOException