com.facebook.litho.internal

Class SparseFloatArray

java.lang.Object

com.facebook.litho.internal.SparseFloatArray

All Implemented Interfaces:

java.lang.Cloneable

public class SparseFloatArray
extends java.lang.Object
implements java.lang.Cloneable

SparseFloatArray map integers to floats similar to android.util.SparseIntArray

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	append(int key, float 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 SparseFloatArray.
SparseFloatArray	clone()
int[]	copyKeys() Provides a copy of keys.
void	delete(int key) Removes the mapping from the specified key, if there was any.
float	get(int key) Gets the float mapped from the specified key, or 0f if no such mapping has been made.
float	get(int key, float valueIfKeyNotFound) Gets the float mapped from the specified key, or the specified value if no such mapping has been made.
int	indexOfKey(int 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(float 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.
int	keyAt(int index) Given an index in the range 0...size()-1, returns the key from the index th key-value mapping that this SparseFloatArray stores.
void	put(int key, float 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	removeAt(int index) Removes the mapping at the given index.
void	setValueAt(int index, float value) Directly set the value at a particular index.
int	size() Returns the number of key-value mappings that this SparseFloatArray currently stores.
java.lang.String	toString() This implementation composes a string by iterating over its mappings.
float	valueAt(int index) Given an index in the range 0...size()-1, returns the value from the index th key-value mapping that this SparseFloatArray stores.

Methods inherited from class java.lang.Object

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

Constructor Detail

SparseFloatArray

public SparseFloatArray()

Creates a new SparseFloatArray containing no mappings.

SparseFloatArray

public SparseFloatArray(int initialCapacity)

Creates a new SparseFloatArray containing no mappings that will not require any additional memory allocation to store the specified number of mappings. If you supply an initial capacity of 0, the sparse array will be initialized with a light-weight representation not requiring any additional array allocations.

Method Detail

clone

public SparseFloatArray clone()

Overrides:

clone in class java.lang.Object

get

public float get(int key)

Gets the float mapped from the specified key, or 0f if no such mapping has been made.

get

public float get(int key,
                 float valueIfKeyNotFound)

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

delete

public void delete(int key)

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

removeAt

public void removeAt(int index)

Removes the mapping at the given index.

put

public void put(int key,
                float 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 SparseFloatArray currently stores.

keyAt

public int keyAt(int index)

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

The keys corresponding to indices in ascending order are guaranteed to be in ascending order, e.g., keyAt(0) will return the smallest key and keyAt(size()-1) will return the largest key.

valueAt

public float valueAt(int index)

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

The values corresponding to indices in ascending order are guaranteed to be associated with keys in ascending order, e.g., valueAt(0) will return the value associated with the smallest key and valueAt(size()-1) will return the value associated with the largest key.

setValueAt

public void setValueAt(int index,
                       float value)

Directly set the value at a particular index.

indexOfKey

public int indexOfKey(int 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(float 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 SparseFloatArray.

append

public void append(int key,
                   float 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.

copyKeys

public int[] copyKeys()

Provides a copy of keys.

toString

public java.lang.String toString()

This implementation composes a string by iterating over its mappings.

Overrides:

toString in class java.lang.Object