org.ranksys.formats.rec

Class ZipRecommendationFormat<U,I>

java.lang.Object

org.ranksys.formats.rec.TuplesRecommendationFormat<U,I>

org.ranksys.formats.rec.ZipRecommendationFormat<U,I>

Type Parameters:

U - user type

I - item type

All Implemented Interfaces:

RecommendationFormat<U,I>

public class ZipRecommendationFormat<U,I>
extends TuplesRecommendationFormat<U,I>

Format similar to SimpleRecommendationFormat, but files are zipped and scores can be omitted when writing and reading for higher performance when they are not needed and only order matters.

Author:

Saúl Vargas (Saul@VargasSandoval.es)

Nested Class Summary

Nested classes/interfaces inherited from class org.ranksys.formats.rec.TuplesRecommendationFormat

TuplesRecommendationFormat.Reader, TuplesRecommendationFormat.Writer

Constructor Summary

Constructors

Constructor and Description
ZipRecommendationFormat(Parser<U> uParser, Parser<I> iParser, boolean ignoreScores) Constructor.
ZipRecommendationFormat(Parser<U> uParser, Parser<I> iParser, boolean ignoreScores, boolean sortByDecreasingScore) Constructor.

Method Summary

Modifier and Type	Method and Description
RecommendationFormat.Reader<U,I>	getReader(InputStream in) Gets a reader for an input stream.
RecommendationFormat.Writer<U,I>	getWriter(OutputStream out) Gets a writer for an output stream.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.ranksys.formats.rec.RecommendationFormat

getReader, getReader, getReader, getWriter, getWriter, getWriter

Constructor Detail

ZipRecommendationFormat

public ZipRecommendationFormat(Parser<U> uParser,
                               Parser<I> iParser,
                               boolean ignoreScores)

Constructor.

Parameters:

uParser - user parser

iParser - item parser

ignoreScores - should scores be read or written?

ZipRecommendationFormat

public ZipRecommendationFormat(Parser<U> uParser,
                               Parser<I> iParser,
                               boolean ignoreScores,
                               boolean sortByDecreasingScore)

Constructor.

Parameters:

uParser - user parser

iParser - item parser

ignoreScores - should scores be read or written?

sortByDecreasingScore - sort read tuples by decreasing score?

Method Detail

getWriter

public RecommendationFormat.Writer<U,I> getWriter(OutputStream out)
                                           throws IOException

Description copied from interface: RecommendationFormat

Gets a writer for an output stream.

Specified by:

getWriter in interface RecommendationFormat<U,I>

Overrides:

getWriter in class TuplesRecommendationFormat<U,I>

Parameters:

out - output stream

Returns:

a recommendation writer

Throws:

IOException - if path does not exist or IO error

getReader

public RecommendationFormat.Reader<U,I> getReader(InputStream in)
                                           throws IOException

Description copied from interface: RecommendationFormat

Gets a reader for an input stream.

Specified by:

getReader in interface RecommendationFormat<U,I>

Overrides:

getReader in class TuplesRecommendationFormat<U,I>

Parameters:

in - input stream

Returns:

a recommendation reader

Throws:

IOException - when IO error