org.openimaj.util.array

Class DoubleArrayView

java.lang.Object

org.openimaj.util.array.DoubleArrayView

All Implemented Interfaces:

Cloneable

public class DoubleArrayView
extends Object
implements Cloneable

A wrapper around a java double array that allows views onto the array to be created without the overhead of maintaining copies of the data.

Author:

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

Constructor Summary

Constructors

Constructor and Description
DoubleArrayView(double[] array) Create a view on the entirety of the given array.
DoubleArrayView(double[] array, int l, int r) Create a view on the given array from l (inclusive) to r (exclusive).
DoubleArrayView(int n) Create a view on an array of length n.

Method Summary

Modifier and Type	Method and Description
DoubleArrayView	clone()
double	get(int i) Get the ith element of this array view.
double	getFast(int i) Get the ith element of this array view omitting any bounds checks.
double[]	getUnderlyingStorage() Get access to the underlying array of this view.
void	set(int i, double v) Set the ith element of this array view to the value v.
void	setFast(int i, double v) Set the ith element of this array view to the value v.
int	size() Get the size (number of elements) in the view.
DoubleArrayView	subView(int l1, int r1) Get a subview of this view from l1 (inclusive) to r1 (exclusive).
double[]	toArray() Convert this view to an array.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

DoubleArrayView

public DoubleArrayView(double[] array,
                       int l,
                       int r)

Create a view on the given array from l (inclusive) to r (exclusive).

Parameters:

array - the array

l - start (left) index

r - end (right) index

DoubleArrayView

public DoubleArrayView(double[] array)

Create a view on the entirety of the given array.

Parameters:

array - the array.

DoubleArrayView

public DoubleArrayView(int n)

Create a view on an array of length n. The underlying array is initialised automatically.

Parameters:

n - the length of the view and underlying array.

Method Detail

subView

public DoubleArrayView subView(int l1,
                               int r1)

Get a subview of this view from l1 (inclusive) to r1 (exclusive).

Parameters:

l1 - start (left) index

r1 - end (right) index

Returns:

subview

get

public double get(int i)

Get the ith element of this array view.

Parameters:

i - the index to get

Returns:

the value at the ith index

getFast

public double getFast(int i)

Get the ith element of this array view omitting any bounds checks.

Parameters:

i - the index to get

Returns:

the value at the ith index

set

public void set(int i,
                double v)

Set the ith element of this array view to the value v.

Parameters:

i - the index to set

v - the value to set

setFast

public void setFast(int i,
                    double v)

Set the ith element of this array view to the value v. Bounds checks are omitted.

Parameters:

i - the index to set

v - the value to set

getUnderlyingStorage

public double[] getUnderlyingStorage()

Get access to the underlying array of this view.

Returns:

the underlying array.

size

public int size()

Get the size (number of elements) in the view.

Returns:

the size

toArray

public double[] toArray()

Convert this view to an array.

Returns:

a copy of the view's data as an array

toString

public String toString()

Overrides:

toString in class Object

clone

public DoubleArrayView clone()

Overrides:

clone in class Object