Package org.eclipse.jgit.util

Class BlockList<T>

java.lang.Object

java.util.AbstractCollection<E>

java.util.AbstractList<T>

org.eclipse.jgit.util.BlockList<T>

Type Parameters:

T - type of list element.

All Implemented Interfaces:

Iterable<T>, Collection<T>, List<T>

public class BlockList<T>
extends AbstractList<T>

Random access list that allocates entries in blocks.

Unlike ArrayList, this type does not need to reallocate the internal array in order to expand the capacity of the list. Access to any element is constant time, but requires two array lookups instead of one.

To handle common usages, add(Object) and iterator() use internal code paths to amortize out the second array lookup, making addition and simple iteration closer to one array operation per element processed.

Similar to ArrayList, adding or removing from any position except the end of the list requires O(N) time to copy all elements between the modification point and the end of the list. Applications are strongly encouraged to not use this access pattern with this list implementation.

Field Summary

Fields inherited from class java.util.AbstractList

modCount

Constructor Summary

Constructors

Constructor	Description
BlockList()	Initialize an empty list.
BlockList(int capacity)	Initialize an empty list with an expected capacity.

Method Summary

Modifier and Type	Method	Description
void	add(int index, T element)
boolean	add(T element)
void	addAll(BlockList<T> src)	Quickly append all elements of another BlockList.
void	addAll(T[] src, int srcIdx, int srcCnt)	Quickly append all elements from an array.
void	clear()
T	get(int index)
Iterator<T>	iterator()
T	remove(int index)
T	set(int index, T element)
int	size()

Methods inherited from class java.util.AbstractList

addAll, equals, hashCode, indexOf, lastIndexOf, listIterator, listIterator, removeRange, subList

Methods inherited from class java.util.AbstractCollection

addAll, contains, containsAll, isEmpty, remove, removeAll, retainAll, toArray, toArray, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Collection

parallelStream, removeIf, stream, toArray

Methods inherited from interface java.lang.Iterable

forEach

Methods inherited from interface java.util.List

addAll, contains, containsAll, isEmpty, remove, removeAll, replaceAll, retainAll, sort, spliterator, toArray, toArray

Constructor Detail

BlockList

public BlockList()

Initialize an empty list.

BlockList

public BlockList(int capacity)

Initialize an empty list with an expected capacity.

Parameters:

capacity - number of elements expected to be in the list.

Method Detail

size

public int size()

Specified by:

size in interface Collection<T>

Specified by:

size in interface List<T>

Specified by:

size in class AbstractCollection<T>

clear

public void clear()

Specified by:

clear in interface Collection<T>

Specified by:

clear in interface List<T>

Overrides:

clear in class AbstractList<T>

get

public T get(int index)

Specified by:

get in interface List<T>

Specified by:

get in class AbstractList<T>

set

public T set(int index,
             T element)

Specified by:

set in interface List<T>

Overrides:

set in class AbstractList<T>

addAll

public void addAll(BlockList<T> src)

Quickly append all elements of another BlockList.

Parameters:

src - the list to copy elements from.

addAll

public void addAll(T[] src,
                   int srcIdx,
                   int srcCnt)

Quickly append all elements from an array.

Parameters:

src - the source array.

srcIdx - first index to copy.

srcCnt - number of elements to copy.

add

public boolean add(T element)

Specified by:

add in interface Collection<T>

Specified by:

add in interface List<T>

Overrides:

add in class AbstractList<T>

add

public void add(int index,
                T element)

Specified by:

add in interface List<T>

Overrides:

add in class AbstractList<T>

remove

public T remove(int index)

Specified by:

remove in interface List<T>

Overrides:

remove in class AbstractList<T>

iterator

public Iterator<T> iterator()

Specified by:

iterator in interface Collection<T>

Specified by:

iterator in interface Iterable<T>

Specified by:

iterator in interface List<T>

Overrides:

iterator in class AbstractList<T>