org.openimaj.data

Class LongArrayBackedDataSource

java.lang.Object

org.openimaj.data.LongArrayBackedDataSource

All Implemented Interfaces:

Iterable<long[]>, DataSource<long[]>

public class LongArrayBackedDataSource
extends Object
implements DataSource<long[]>

A DataSource backed by a 2D array of longs.

Author:

Jonathon Hare (jsh2@ecs.soton.ac.uk)

Field Summary

Fields

Modifier and Type	Field and Description
protected long[][]	data
protected Random	rng

Constructor Summary

Constructors

Constructor and Description
LongArrayBackedDataSource(long[][] data) Construct with data
LongArrayBackedDataSource(long[][] data, Random rng) Construct with data and a random generator for random sampling

Method Summary

Methods

Modifier and Type	Method and Description
long[]	getData(int row) Get the data for a given row
void	getData(int startRow, int stopRow, long[][] output) Get data between given rows.
void	getRandomRows(long[][] output)
Iterator<long[]>	iterator()
int	numDimensions()
int	numRows()

Methods inherited from class java.lang.Object

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

Field Detail

data

protected long[][] data

rng

protected Random rng

Constructor Detail

LongArrayBackedDataSource

public LongArrayBackedDataSource(long[][] data)

Construct with data

Parameters:

data - the data

LongArrayBackedDataSource

public LongArrayBackedDataSource(long[][] data,
                         Random rng)

Construct with data and a random generator for random sampling

Parameters:

data - the data

rng - the random generator

Method Detail

getData

public final void getData(int startRow,
           int stopRow,
           long[][] output)

Description copied from interface: DataSource

Get data between given rows. startRow must be > 0, stopRow must be smaller than DataSource.numRows(). data is guaranteed to have (stopRow - startRow) valid entries

Specified by:

getData in interface DataSource<long[]>

Parameters:

startRow - where to start (inclusive)

stopRow - where to stop (exclusive)

output - the array to fill

getRandomRows

public final void getRandomRows(long[][] output)

Specified by:

getRandomRows in interface DataSource<long[]>

Parameters:

output - a random set of data. This array is guaranteed to be filled.

numDimensions

public int numDimensions()

Specified by:

numDimensions in interface DataSource<long[]>

Returns:

Number of dimensions of each data point

numRows

public int numRows()

Specified by:

numRows in interface DataSource<long[]>

Returns:

the number of data points

getData

public long[] getData(int row)

Description copied from interface: DataSource

Get the data for a given row

Specified by:

getData in interface DataSource<long[]>

Parameters:

row - the row number

Returns:

the data for the row

iterator

public Iterator<long[]> iterator()

Specified by:

iterator in interface Iterable<long[]>