Package it.unimi.dsi.fastutil.doubles

Class Double2FloatArrayMap

java.lang.Object

it.unimi.dsi.fastutil.doubles.AbstractDouble2FloatFunction

it.unimi.dsi.fastutil.doubles.AbstractDouble2FloatMap

it.unimi.dsi.fastutil.doubles.Double2FloatArrayMap

All Implemented Interfaces:

Double2FloatFunction, Double2FloatMap, Function<Double,Float>, Serializable, Cloneable, DoubleUnaryOperator, Function<Double,Float>, Map<Double,Float>

public class Double2FloatArrayMap
extends AbstractDouble2FloatMap
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.doubles.AbstractDouble2FloatMap

AbstractDouble2FloatMap.BasicEntry, AbstractDouble2FloatMap.BasicEntrySet

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.doubles.Double2FloatMap

Double2FloatMap.Entry, Double2FloatMap.FastEntrySet

Constructor Summary

Constructors

Constructor	Description
Double2FloatArrayMap()	Creates a new empty array map.
Double2FloatArrayMap(double[] key, float[] value)	Creates a new empty array map with given key and value backing arrays.
Double2FloatArrayMap(double[] key, float[] value, int size)	Creates a new array map with given key and value backing arrays, using the given number of elements.
Double2FloatArrayMap(int capacity)	Creates a new empty array map of given capacity.
Double2FloatArrayMap(Double2FloatMap m)	Creates a new empty array map copying the entries of a given map.
Double2FloatArrayMap(Map<? extends Double,? extends Float> m)	Creates a new empty array map copying the entries of a given map.

Method Summary

Modifier and Type	Method	Description
void	clear()	Removes all of the mappings from this map (optional operation).
Double2FloatArrayMap	clone()	Returns a deep copy of this map.
boolean	containsKey(double k)	Returns true if this function contains a mapping for the specified key.
boolean	containsValue(float v)	Returns true if this map maps one or more keys to the specified value.
Double2FloatMap.FastEntrySet	double2FloatEntrySet()	Returns a type-specific set view of the mappings contained in this map.
float	get(double k)	Returns the value to which the given key is mapped.
boolean	isEmpty()
DoubleSet	keySet()	Returns a type-specific-set view of the keys of this map.
float	put(double k, float v)	Adds a pair to the map (optional operation).
float	remove(double k)	Removes the mapping with the given key (optional operation).
int	size()	Returns the number of key/value mappings in this map.
FloatCollection	values()	Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.doubles.AbstractDouble2FloatMap

equals, hashCode, putAll, toString

Methods inherited from class it.unimi.dsi.fastutil.doubles.AbstractDouble2FloatFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.doubles.Double2FloatFunction

andThen, andThenByte, andThenChar, andThenDouble, andThenFloat, andThenInt, andThenLong, andThenObject, andThenReference, andThenShort, applyAsDouble, compose, composeByte, composeChar, composeDouble, composeFloat, composeInt, composeLong, composeObject, composeReference, composeShort

Methods inherited from interface it.unimi.dsi.fastutil.doubles.Double2FloatMap

compute, compute, computeIfAbsent, computeIfAbsent, computeIfAbsent, computeIfAbsentNullable, computeIfAbsentPartial, computeIfPresent, computeIfPresent, containsKey, containsValue, defaultReturnValue, defaultReturnValue, entrySet, forEach, get, getOrDefault, getOrDefault, merge, merge, mergeFloat, mergeFloat, put, putIfAbsent, putIfAbsent, remove, remove, remove, replace, replace, replace, replace

Methods inherited from interface java.util.function.DoubleUnaryOperator

andThen, compose

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

apply

Methods inherited from interface java.util.Map

replaceAll

Constructor Details

Double2FloatArrayMap

public Double2FloatArrayMap(double[] key,
 float[] value)

Creates a new empty array map with given key and value backing arrays. The resulting map will have as many entries as the given arrays.

It is responsibility of the caller that the elements of key are distinct.

Parameters:

key - the key array.

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

Double2FloatArrayMap

public Double2FloatArrayMap()

Creates a new empty array map.

Double2FloatArrayMap

public Double2FloatArrayMap(int capacity)

Creates a new empty array map of given capacity.

Parameters:

capacity - the initial capacity.

Double2FloatArrayMap

public Double2FloatArrayMap(Double2FloatMap m)

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

Parameters:

m - a map.

Double2FloatArrayMap

public Double2FloatArrayMap(Map<? extends Double,? extends Float> m)

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

Parameters:

m - a map.

Double2FloatArrayMap

public Double2FloatArrayMap(double[] key,
 float[] value,
 int size)

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

It is responsibility of the caller that the first size elements of key are distinct.

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 Details

double2FloatEntrySet

public Double2FloatMap.FastEntrySet double2FloatEntrySet()

Description copied from interface: Double2FloatMap

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 Map.entrySet() so that it returns an ObjectSet of type-specific entries (the latter makes it possible to access keys and values with type-specific methods).

Specified by:

double2FloatEntrySet in interface Double2FloatMap

Returns:

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

See Also:

• Map.entrySet()

get

public float get(double k)

Description copied from interface: Double2FloatFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Double2FloatFunction

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: Double2FloatMap

Returns the number of key/value mappings in this map. If the map contains more than Integer.MAX_VALUE elements, returns Integer.MAX_VALUE.

Specified by:

size in interface Double2FloatMap

Specified by:

size in interface Function<Double,Float>

Specified by:

size in interface Map<Double,Float>

Returns:

the number of key-value mappings in this map.

See Also:

• Size64

clear

public void clear()

Description copied from interface: Double2FloatMap

Removes all of the mappings from this map (optional operation). The map will be empty after this call returns.

Specified by:

clear in interface Double2FloatMap

Specified by:

clear in interface Function<Double,Float>

Specified by:

clear in interface Map<Double,Float>

See Also:

• Map.clear()

containsKey

public boolean containsKey(double k)

Description copied from class: AbstractDouble2FloatMap

Returns true if this function contains a mapping for the specified key.

Specified by:

containsKey in interface Double2FloatFunction

Specified by:

containsKey in interface Double2FloatMap

Overrides:

containsKey in class AbstractDouble2FloatMap

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

• Map.containsKey(Object)

containsValue

public boolean containsValue(float v)

Description copied from class: AbstractDouble2FloatMap

Returns true if this map maps one or more keys to the specified value.

Specified by:

containsValue in interface Double2FloatMap

Overrides:

containsValue in class AbstractDouble2FloatMap

See Also:

• Map.containsValue(Object)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Double,Float>

Overrides:

isEmpty in class AbstractDouble2FloatMap

put

public float put(double k,
 float v)

Description copied from interface: Double2FloatFunction

Adds a pair to the map (optional operation).

Specified by:

put in interface Double2FloatFunction

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(double k)

Description copied from interface: Double2FloatFunction

Removes the mapping with the given key (optional operation).

Specified by:

remove in interface Double2FloatFunction

Parameters:

k - the key.

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 DoubleSet keySet()

Description copied from class: AbstractDouble2FloatMap

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

The view is backed by the set returned by Map.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 Double2FloatMap

Specified by:

keySet in interface Map<Double,Float>

Overrides:

keySet in class AbstractDouble2FloatMap

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: AbstractDouble2FloatMap

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

The view is backed by the set returned by Map.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 Double2FloatMap

Specified by:

values in interface Map<Double,Float>

Overrides:

values in class AbstractDouble2FloatMap

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 Double2FloatArrayMap 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.

Returns:

a deep copy of this map.