Package org.apache.hadoop.hdfs.server.namenode.snapshot

Interface DiffList<T extends java.lang.Comparable<java.lang.Integer>>

Type Parameters:

T - Type of the object in this list.

All Superinterfaces:

java.lang.Iterable<T>

All Known Implementing Classes:

DiffListByArrayList, DiffListBySkipList

public interface DiffList<T extends java.lang.Comparable<java.lang.Integer>>
extends java.lang.Iterable<T>

This interface defines the methods used to store and manage InodeDiffs.

Field Summary

Fields

Modifier and Type	Field	Description
static DiffList	EMPTY_LIST

Method Summary

Modifier and Type	Method	Description
void	addFirst(T t)	Adds an element at the beginning of the list.
boolean	addLast(T t)	Adds an element at the end of the list.
int	binarySearch(int key)	Searches the list for the specified object using the binary search algorithm.
static <T extends java.lang.Comparable<java.lang.Integer>> DiffList<T>	emptyList()	Returns an empty DiffList.
T	get(int index)	Returns the element at the specified position in this list.
java.util.List<T>	getMinListForRange(int startIndex, int endIndex, INodeDirectory dir)	Returns the list of minimal list of elements need to combine to generate cumulative sum from startIndex to endIndex.
boolean	isEmpty()	Returns true if this list contains no elements.
T	remove(int index)	Removes the element at the specified position in this list.
int	size()	Returns the number of elements in this list.
static <T extends java.lang.Comparable<java.lang.Integer>> DiffList<T>	unmodifiableList(DiffList<T> diffs)	Returns an unmodifiable diffList.

Methods inherited from interface java.lang.Iterable

forEach, iterator, spliterator

Field Detail

EMPTY_LIST

static final DiffList EMPTY_LIST

Method Detail

emptyList

static <T extends java.lang.Comparable<java.lang.Integer>> DiffList<T> emptyList()

Returns an empty DiffList.

unmodifiableList

static <T extends java.lang.Comparable<java.lang.Integer>> DiffList<T> unmodifiableList(DiffList<T> diffs)

Returns an unmodifiable diffList.

Type Parameters:

T - Type of the object in the the diffList

Parameters:

diffs - DiffList

Returns:

Unmodifiable diffList

get

T get(int index)

Returns the element at the specified position in this list.

Parameters:

index - index of the element to return

Returns:

the element at the specified position in this list

Throws:

java.lang.IndexOutOfBoundsException - if the index is out of range (index < 0 || index >= size())

isEmpty

boolean isEmpty()

Returns true if this list contains no elements.

Returns:

true if this list contains no elements

size

int size()

Returns the number of elements in this list.

Returns:

the number of elements in this list.

remove

T remove(int index)

Removes the element at the specified position in this list.

Parameters:

index - the index of the element to be removed

Returns:

the element previously at the specified position

addLast

boolean addLast(T t)

Adds an element at the end of the list.

Parameters:

t - element to be appended to this list

Returns:

true, if insertion is successful

addFirst

void addFirst(T t)

Adds an element at the beginning of the list.

Parameters:

t - element to be added to this list

binarySearch

int binarySearch(int key)

Searches the list for the specified object using the binary search algorithm.

Parameters:

key - key to be searched for

Returns:

the index of the search key, if it is contained in the list otherwise, (-insertion point - 1).

getMinListForRange

java.util.List<T> getMinListForRange(int startIndex,
                                     int endIndex,
                                     INodeDirectory dir)

Returns the list of minimal list of elements need to combine to generate cumulative sum from startIndex to endIndex.

Parameters:

startIndex -

endIndex -

Returns:

list of T