uk.ac.starlink.util

Class PrimitiveList

java.lang.Object

uk.ac.starlink.util.PrimitiveList

Direct Known Subclasses:

ByteList, DoubleList, FloatList, IntList, LongList, ShortList

public abstract class PrimitiveList
extends Object

Provides an extendable list of primitive values. This provides an abstract superclass for concrete implementations which do roughly the same job for numeric primitive types that StringBuffer does for chars and List does for Objects.

Since:

12 Oct 2006

Author:

Mark Taylor

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PrimitiveList(Object array, int size) Constructs a list from an initial array object, whose component type determines the primitive type which this list will work with, and a size, which indicates number of elements of the array which are initially considered to constitute the contents of this list.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the elements from this list (optional operation).
protected int	nextCapacity(int currentCapacity) Determines by how much the storage array will grow if it needs to expand.
int	size() Returns the current size of this list.
Object	toArray() Creates and returns a copy of the contents of this list, in the form of a primitive array of the right length to hold all the elements it currently contains.

Methods inherited from class java.lang.Object

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

Constructor Detail

PrimitiveList

protected PrimitiveList(Object array,
                        int size)

Constructs a list from an initial array object, whose component type determines the primitive type which this list will work with, and a size, which indicates number of elements of the array which are initially considered to constitute the contents of this list.

Parameters:

array - array object

size - initial list size (note, not capacity)

Method Detail

size

public int size()

Returns the current size of this list.

Returns:

number of elements which have been stored

clear

public void clear()

Removes all of the elements from this list (optional operation). The list will be empty after this call returns.

toArray

public Object toArray()

Creates and returns a copy of the contents of this list, in the form of a primitive array of the right length to hold all the elements it currently contains.

Returns:

array containing contents of this list

nextCapacity

protected int nextCapacity(int currentCapacity)

Determines by how much the storage array will grow if it needs to expand. Any return value is legal; if a value less than the currentCapacity is returned, Integer.MAX_VALUE will be used. The effect of this is that implementations probably do not need to worry about integer arithmetic overflow. May be overridden by subclasses.

Parameters:

currentCapacity - initial size of buffer

Returns:

next size up