Class GrowableArray

java.lang.Object

cnuphys.splot.pdata.GrowableArray

Direct Known Subclasses:

DataColumn

public class GrowableArray
extends Object

This class supports named arrays that grow. They are an alternative to Vectors or ArrayLists. The advantages are speed and usage for those cases where arrays are more convenient. Clients only have access to minimal copies which can be used as "just the right size" arrays.

Author:

heddle

Field Summary

Fields

Modifier and Type	Field	Description
protected double[]	_data
protected int	_dataLen
protected int	_increment
protected int	_initCap
protected double	_maxValue
protected double	_minValue

Constructor Summary

Constructors

Constructor	Description
GrowableArray()	Creates a GrowableArray with initial capacity 100 and increment 100.
GrowableArray(int initCap, int increment)	Create a GrowableArray

Method Summary

Modifier and Type	Method	Description
void	add(double val)	Add a value to the array, growing it if necessary.
void	clear()	Reset the data array to the initial capacity and fill with all NaNs.
double	get(int index)	Get the value at the given index
double	getMaxValue()	Get the maximum data value
double[]	getMinimalCopy()	Get the minimal copy of the data array.
double	getMinValue()	Get the minimum data value
void	removeFirst()	removes the first entry and moves all other entries up one
void	set(int index, double val)	Set the value at the given index
int	size()	Get the number of real data in the array, which in general is less than the length of the array.

Methods inherited from class java.lang.Object

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

Field Details

_data

protected double[] _data

_dataLen

protected int _dataLen

_increment

protected int _increment

_initCap

protected int _initCap

_minValue

protected double _minValue

_maxValue

protected double _maxValue

Constructor Details

GrowableArray

public GrowableArray()

Creates a GrowableArray with initial capacity 100 and increment 100.

GrowableArray

public GrowableArray(int initCap,
 int increment)

Create a GrowableArray

Parameters:

initCap - the initial capacity

increment - the increment when the array grows.

Method Details

size

public int size()

Get the number of real data in the array, which in general is less than the length of the array. This is the effective length of the array, so loops should go from 0 to this value minus 1.

Returns:

the number of real data.

getMinimalCopy

public double[] getMinimalCopy()

Get the minimal copy of the data array. This copies the actual data into a new array of just the right size. This new array can be used normally, i.e., it is safe to use its length.

Returns:

a copy of the data array of just the right length

removeFirst

public void removeFirst()

removes the first entry and moves all other entries up one

add

public void add(double val)

Add a value to the array, growing it if necessary.

Parameters:

val - the value to add

getMinValue

public double getMinValue()

Get the minimum data value

Returns:

the minimum data value

getMaxValue

public double getMaxValue()

Get the maximum data value

Returns:

the maximum data value

clear

public void clear()

Reset the data array to the initial capacity and fill with all NaNs.

get

public double get(int index)

Get the value at the given index

Parameters:

index - the index

Returns:

the value at the index

set

public void set(int index,
 double val)

Set the value at the given index

Parameters:

index - the index

val - the value at the index