org.apache.mahout.cf.taste.example.kddcup

Class DataFileIterator

java.lang.Object

com.google.common.collect.UnmodifiableIterator<T>

com.google.common.collect.AbstractIterator<Pair<PreferenceArray,long[]>>

org.apache.mahout.cf.taste.example.kddcup.DataFileIterator

All Implemented Interfaces:

Closeable, AutoCloseable, Iterator<Pair<PreferenceArray,long[]>>, SkippingIterator<Pair<PreferenceArray,long[]>>

public final class DataFileIterator
extends com.google.common.collect.AbstractIterator<Pair<PreferenceArray,long[]>>
implements SkippingIterator<Pair<PreferenceArray,long[]>>, Closeable

An Iterator which iterates over any of the KDD Cup's rating files. These include the files {train,test,validation}Idx{1,2}}.txt. See http://kddcup.yahoo.com/. Each element in the iteration corresponds to one user's ratings as a PreferenceArray and corresponding timestamps as a parallel long array.

Timestamps in the data set are relative to some unknown point in time, for anonymity. They are assumed to be relative to the epoch, time 0, or January 1 1970, for purposes here.

Constructor Summary

Constructors

Constructor and Description
DataFileIterator(File dataFile)

Method Summary

Modifier and Type	Method and Description
void	close()
protected Pair<PreferenceArray,long[]>	computeNext()
void	skip(int n)

Methods inherited from class com.google.common.collect.AbstractIterator

endOfData, hasNext, next, peek

Methods inherited from class com.google.common.collect.UnmodifiableIterator

remove

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.Iterator

forEachRemaining, hasNext, next, remove

Constructor Detail

DataFileIterator

public DataFileIterator(File dataFile)
                 throws IOException

Throws:

IOException

Method Detail

computeNext

protected Pair<PreferenceArray,long[]> computeNext()

Specified by:

computeNext in class com.google.common.collect.AbstractIterator<Pair<PreferenceArray,long[]>>

skip

public void skip(int n)

Specified by:

skip in interface SkippingIterator<Pair<PreferenceArray,long[]>>

close

public void close()

Specified by:

close in interface Closeable

Specified by:

close in interface AutoCloseable