it.unimi.dsi.fastutil.longs
Class Long2FloatArrayMap

java.lang.Object
  it.unimi.dsi.fastutil.longs.AbstractLong2FloatFunction
      it.unimi.dsi.fastutil.longs.AbstractLong2FloatMap
          it.unimi.dsi.fastutil.longs.Long2FloatArrayMap

All Implemented Interfaces:

Function<Long,Float>, Long2FloatFunction, Long2FloatMap, Serializable, Cloneable, Map<Long,Float>

public class Long2FloatArrayMap
extends AbstractLong2FloatMap
implements Serializable, Cloneable

A simple, brute-force implementation of a map based on two parallel backing arrays.

The main purpose of this implementation is that of wrapping cleanly the brute-force approach to the storage of a very small number of pairs: just put them into two parallel arrays and scan linearly to find an item.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2FloatMap

AbstractLong2FloatMap.BasicEntry

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.longs.Long2FloatMap

Long2FloatMap.Entry, Long2FloatMap.FastEntrySet

Constructor Summary

Long2FloatArrayMap()
Creates a new empty array map.

Long2FloatArrayMap(int capacity)
Creates a new empty array map of given capacity.

Long2FloatArrayMap(long[] key, float[] value)
Creates a new empty array map with given key and value backing arrays.

Long2FloatArrayMap(long[] key, float[] value, int size)
Creates a new array map with given key and value backing arrays, using the given number of elements.

Long2FloatArrayMap(Long2FloatMap m)
Creates a new empty array map copying the entries of a given map.

Method Summary

void	clear() Removes all associations from this function (optional operation).
Object	clone() Returns a deep copy of this map.
boolean	containsKey(long k) Checks whether the given value is contained in AbstractLong2FloatMap.keySet().
boolean	containsValue(float v) Checks whether the given value is contained in AbstractLong2FloatMap.values().
float	get(long k) Returns the value to which the given key is mapped.
boolean	isEmpty()
LongSet	keySet() Returns a type-specific-set view of the keys of this map.
Long2FloatMap.FastEntrySet	long2FloatEntrySet() Returns a type-specific set view of the mappings contained in this map.
float	put(long k, float v) Adds a pair to the map.
float	remove(long k) Removes the mapping with the given key.
int	size() Returns the intended number of keys in this function, or -1 if no such number exists.
FloatCollection	values() Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2FloatMap

containsValue, entrySet, equals, hashCode, putAll, toString

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2FloatFunction

containsKey, defaultReturnValue, defaultReturnValue, get, put, remove

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2FloatFunction

defaultReturnValue, defaultReturnValue

Methods inherited from interface it.unimi.dsi.fastutil.Function

containsKey, get, put, remove

Methods inherited from interface java.util.Map

containsKey, get, put, remove

Constructor Detail

Long2FloatArrayMap

public Long2FloatArrayMap(long[] key,
                          float[] value)

Creates a new empty array map with given key and value backing arrays.

Parameters:

key - the key array.

value - the value array (it must have the same length as key).

Long2FloatArrayMap

public Long2FloatArrayMap()

Creates a new empty array map.

Long2FloatArrayMap

public Long2FloatArrayMap(int capacity)

Creates a new empty array map of given capacity.

Parameters:

capacity - the initial capacity.

Long2FloatArrayMap

public Long2FloatArrayMap(Long2FloatMap m)

Creates a new empty array map copying the entries of a given map.

Parameters:

m - a map.

Long2FloatArrayMap

public Long2FloatArrayMap(long[] key,
                          float[] value,
                          int size)

Creates a new array map with given key and value backing arrays, using the given number of elements.

Parameters:

key - the key array.

value - the value array (it must have the same length as key).

size - the number of valid elements in key and value.

Method Detail

long2FloatEntrySet

public Long2FloatMap.FastEntrySet long2FloatEntrySet()

Description copied from interface: Long2FloatMap

Returns a type-specific set view of the mappings contained in this map.

This method is necessary because there is no inheritance along type parameters: it is thus impossible to strengthen Long2FloatMap.entrySet() so that it returns an ObjectSet of objects of type Long2FloatMap.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:

long2FloatEntrySet in interface Long2FloatMap

Returns:

a type-specific set view of the mappings contained in this map.

See Also:

Long2FloatMap.entrySet()

get

public float get(long k)

Description copied from interface: Long2FloatFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Long2FloatFunction

Parameters:

k - the key.

Returns:

the corresponding value, or the default return value if no value was present for the given key.

See Also:

Function.get(Object)

size

public int size()

Description copied from interface: Function

Returns the intended number of keys in this function, or -1 if no such number exists.

Most function implementations will have some knowledge of the intended number of keys in their domain. In some cases, however, this might not be possible.

Specified by:

size in interface Function<Long,Float>

Specified by:

size in interface Map<Long,Float>

Returns:

the intended number of keys in this function, or -1 if that number is not available.

clear

public void clear()

Description copied from interface: Function

Removes all associations from this function (optional operation).

Specified by:

clear in interface Function<Long,Float>

Specified by:

clear in interface Map<Long,Float>

Overrides:

clear in class AbstractLong2FloatFunction

See Also:

Map.clear()

containsKey

public boolean containsKey(long k)

Description copied from class: AbstractLong2FloatMap

Checks whether the given value is contained in AbstractLong2FloatMap.keySet().

Specified by:

containsKey in interface Long2FloatFunction

Overrides:

containsKey in class AbstractLong2FloatMap

See Also:

Function.containsKey(Object)

containsValue

public boolean containsValue(float v)

Description copied from class: AbstractLong2FloatMap

Checks whether the given value is contained in AbstractLong2FloatMap.values().

Specified by:

containsValue in interface Long2FloatMap

Overrides:

containsValue in class AbstractLong2FloatMap

See Also:

Map.containsValue(Object)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Long,Float>

Overrides:

isEmpty in class AbstractLong2FloatMap

put

public float put(long k,
                 float v)

Description copied from interface: Long2FloatFunction

Adds a pair to the map.

Specified by:

put in interface Long2FloatFunction

Overrides:

put in class AbstractLong2FloatFunction

Parameters:

k - the key.

v - the value.

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

Function.put(Object,Object)

remove

public float remove(long k)

Description copied from interface: Long2FloatFunction

Removes the mapping with the given key.

Specified by:

remove in interface Long2FloatFunction

Overrides:

remove in class AbstractLong2FloatFunction

Returns:

the old value, or the default return value if no value was present for the given key.

See Also:

Function.remove(Object)

keySet

public LongSet keySet()

Description copied from class: AbstractLong2FloatMap

Returns a type-specific-set view of the keys of this map.

The view is backed by the set returned by AbstractLong2FloatMap.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

Specified by:

keySet in interface Long2FloatMap

Specified by:

keySet in interface Map<Long,Float>

Overrides:

keySet in class AbstractLong2FloatMap

Returns:

a set view of the keys of this map; it may be safely cast to a type-specific interface.

See Also:

Map.keySet()

values

public FloatCollection values()

Description copied from class: AbstractLong2FloatMap

Returns a type-specific-set view of the values of this map.

The view is backed by the set returned by AbstractLong2FloatMap.entrySet(). Note that no attempt is made at caching the result of this method, as this would require adding some attributes that lightweight implementations would not need. Subclasses may easily override this policy by calling this method and caching the result, but implementors are encouraged to write more efficient ad-hoc implementations.

Specified by:

values in interface Long2FloatMap

Specified by:

values in interface Map<Long,Float>

Overrides:

values in class AbstractLong2FloatMap

Returns:

a set view of the values of this map; it may be safely cast to a type-specific interface.

See Also:

Map.values()

clone

public Object clone()

Returns a deep copy of this map.

This method performs a deep copy of this hash map; the data stored in the map, however, is not cloned. Note that this makes a difference only for object keys.

Overrides:

clone in class Object

Returns:

a deep copy of this map.