org.openimaj.data

Class IndexedViewDataSource<DATATYPE>

java.lang.Object

org.openimaj.data.AbstractDataSource<DATATYPE>

org.openimaj.data.IndexedViewDataSource<DATATYPE>

Type Parameters:

DATATYPE - the data type which can be returned

All Implemented Interfaces:

Iterable<DATATYPE>, DataSource<DATATYPE>

Direct Known Subclasses:

RandomSampleDataSource

public class IndexedViewDataSource<DATATYPE>
extends AbstractDataSource<DATATYPE>

This DataSource provides an indexed view of a subset of another DataSource.

Author:

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

Constructor Summary

Constructors

Constructor and Description
IndexedViewDataSource(DataSource<DATATYPE> dataSource, int[] indexes) Construct a new IndexedViewDataSource with the given inner data and indexes into the inner data.

Method Summary

Modifier and Type	Method and Description
DATATYPE[]	createTemporaryArray(int size) Create a temporary array suitable for use with the DataSource.getRandomRows(Object[]) and DataSource.getData(int, int, Object[]) methods.
DATATYPE	getData(int row) Get the data for a given row
void	getData(int startRow, int stopRow, DATATYPE[] data) Get data between given rows.
int	numDimensions()
int	size()

Methods inherited from class org.openimaj.data.AbstractDataSource

getRandomRows, iterator

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

IndexedViewDataSource

public IndexedViewDataSource(DataSource<DATATYPE> dataSource,
                             int[] indexes)

Construct a new IndexedViewDataSource with the given inner data and indexes into the inner data.

Parameters:

dataSource - the inner DataSource.

indexes - the indexed into the inner datasource.

Method Detail

getData

public void getData(int startRow,
                    int stopRow,
                    DATATYPE[] data)

Description copied from interface: DataSource

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

Parameters:

startRow - where to start (inclusive)

stopRow - where to stop (exclusive)

data - the array to fill

getData

public DATATYPE getData(int row)

Description copied from interface: DataSource

Get the data for a given row

Parameters:

row - the row number

Returns:

the data for the row

numDimensions

public int numDimensions()

Returns:

Number of dimensions of each data point

size

public int size()

Returns:

the number of data points

createTemporaryArray

public DATATYPE[] createTemporaryArray(int size)

Description copied from interface: DataSource

Create a temporary array suitable for use with the DataSource.getRandomRows(Object[]) and DataSource.getData(int, int, Object[]) methods.

Parameters:

size - the size of the array

Returns:

the array