android.support.v4.util
Class LongSparseArray<E>

java.lang.Object
  android.support.v4.util.LongSparseArray<E>

All Implemented Interfaces:

Cloneable

public class LongSparseArray<E>
extends Object
implements Cloneable

SparseArray mapping longs to Objects. Unlike a normal array of Objects, there can be gaps in the indices. It is intended to be more efficient than using a HashMap to map Longs to Objects.

Constructor Summary

LongSparseArray()
Creates a new LongSparseArray containing no mappings.

LongSparseArray(int initialCapacity)
Creates a new LongSparseArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.

Method Summary

void	append(long key, E value) Puts a key/value pair into the array, optimizing for the case where the key is greater than all existing keys in the array.
void	clear() Removes all key-value mappings from this LongSparseArray.
LongSparseArray<E>	clone()
void	delete(long key) Removes the mapping from the specified key, if there was any.
E	get(long key) Gets the Object mapped from the specified key, or null if no such mapping has been made.
E	get(long key, E valueIfKeyNotFound) Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.
static int	idealByteArraySize(int need)
static int	idealLongArraySize(int need)
int	indexOfKey(long key) Returns the index for which keyAt(int) would return the specified key, or a negative number if the specified key is not mapped.
int	indexOfValue(E value) Returns an index for which valueAt(int) would return the specified key, or a negative number if no keys map to the specified value.
long	keyAt(int index) Given an index in the range 0...size()-1, returns the key from the indexth key-value mapping that this LongSparseArray stores.
void	put(long key, E value) Adds a mapping from the specified key to the specified value, replacing the previous mapping from the specified key if there was one.
void	remove(long key) Alias for delete(long).
void	removeAt(int index) Removes the mapping at the specified index.
void	setValueAt(int index, E value) Given an index in the range 0...size()-1, sets a new value for the indexth key-value mapping that this LongSparseArray stores.
int	size() Returns the number of key-value mappings that this LongSparseArray currently stores.
E	valueAt(int index) Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this LongSparseArray stores.

Methods inherited from class java.lang.Object

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

Constructor Detail

LongSparseArray

public LongSparseArray()

Creates a new LongSparseArray containing no mappings.

LongSparseArray

public LongSparseArray(int initialCapacity)

Creates a new LongSparseArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings.

Method Detail

clone

public LongSparseArray<E> clone()

Overrides:

clone in class Object

get

public E get(long key)

Gets the Object mapped from the specified key, or null if no such mapping has been made.

get

public E get(long key,
             E valueIfKeyNotFound)

Gets the Object mapped from the specified key, or the specified Object if no such mapping has been made.

delete

public void delete(long key)

Removes the mapping from the specified key, if there was any.

remove

public void remove(long key)

Alias for delete(long).

removeAt

public void removeAt(int index)

Removes the mapping at the specified index.

put

public void put(long key,
                E value)

Adds a mapping from the specified key to the specified value, replacing the previous mapping from the specified key if there was one.

size

public int size()

Returns the number of key-value mappings that this LongSparseArray currently stores.

keyAt

public long keyAt(int index)

Given an index in the range 0...size()-1, returns the key from the indexth key-value mapping that this LongSparseArray stores.

valueAt

public E valueAt(int index)

Given an index in the range 0...size()-1, returns the value from the indexth key-value mapping that this LongSparseArray stores.

setValueAt

public void setValueAt(int index,
                       E value)

Given an index in the range 0...size()-1, sets a new value for the indexth key-value mapping that this LongSparseArray stores.

indexOfKey

public int indexOfKey(long key)

Returns the index for which keyAt(int) would return the specified key, or a negative number if the specified key is not mapped.

indexOfValue

public int indexOfValue(E value)

Returns an index for which valueAt(int) would return the specified key, or a negative number if no keys map to the specified value. Beware that this is a linear search, unlike lookups by key, and that multiple keys can map to the same value and this will find only one of them.

clear

public void clear()

Removes all key-value mappings from this LongSparseArray.

append

public void append(long key,
                   E value)

Puts a key/value pair into the array, optimizing for the case where the key is greater than all existing keys in the array.

idealByteArraySize

public static int idealByteArraySize(int need)

idealLongArraySize

public static int idealLongArraySize(int need)