it.unimi.dsi.fastutil.longs

Class Long2ObjectArrayMap<V>

java.lang.Object

it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction<V>

it.unimi.dsi.fastutil.longs.AbstractLong2ObjectMap<V>

it.unimi.dsi.fastutil.longs.Long2ObjectArrayMap<V>

All Implemented Interfaces:

it.unimi.dsi.fastutil.longs.Long2ObjectFunction<V>, Long2ObjectMap<V>, java.io.Serializable, java.lang.Cloneable, java.util.function.Function<java.lang.Long,V>, java.util.function.LongFunction<V>, java.util.Map<java.lang.Long,V>

public class Long2ObjectArrayMap<V>
extends AbstractLong2ObjectMap<V>
implements java.io.Serializable, java.lang.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.AbstractLong2ObjectMap

AbstractLong2ObjectMap.BasicEntry<V>, AbstractLong2ObjectMap.BasicEntrySet<V>

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.longs.Long2ObjectMap

Long2ObjectMap.Entry<V>, Long2ObjectMap.FastEntrySet<V>

Field Summary

Fields

Modifier and Type	Field and Description
protected Long2ObjectMap.FastEntrySet<V>	entries Cached set of entries.
protected long[]	key The keys (valid up to size, excluded).
protected it.unimi.dsi.fastutil.longs.LongSet	keys Cached set of keys.
protected int	size The number of valid entries in key and value.
protected java.lang.Object[]	value The values (parallel to key).
protected it.unimi.dsi.fastutil.objects.ObjectCollection<V>	values Cached collection of values.

Fields inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction

defRetValue

Constructor Summary

Constructors

Constructor and Description
Long2ObjectArrayMap() Creates a new empty array map.
Long2ObjectArrayMap(int capacity) Creates a new empty array map of given capacity.
Long2ObjectArrayMap(long[] key, java.lang.Object[] value) Creates a new empty array map with given key and value backing arrays.
Long2ObjectArrayMap(long[] key, java.lang.Object[] value, int size) Creates a new array map with given key and value backing arrays, using the given number of elements.
Long2ObjectArrayMap(Long2ObjectMap<V> m) Creates a new empty array map copying the entries of a given map.
Long2ObjectArrayMap(java.util.Map<? extends java.lang.Long,? extends V> m) Creates a new empty array map copying the entries of a given map.

Method Summary

Modifier and Type	Method and Description
void	clear() Removes all of the mappings from this map (optional operation).
Long2ObjectArrayMap<V>	clone() Returns a deep copy of this map.
boolean	containsKey(long k) Returns true if this function contains a mapping for the specified key.
boolean	containsValue(java.lang.Object v)
V	get(long k)
boolean	isEmpty()
it.unimi.dsi.fastutil.longs.LongSet	keySet() Returns a type-specific-set view of the keys of this map.
Long2ObjectMap.FastEntrySet<V>	long2ObjectEntrySet() Returns a type-specific set view of the mappings contained in this map.
V	put(long k, V v)
V	remove(long k)
int	size() Returns the number of key/value mappings in this map.
it.unimi.dsi.fastutil.objects.ObjectCollection<V>	values() Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2ObjectMap

equals, hashCode, putAll, toString

Methods inherited from class it.unimi.dsi.fastutil.longs.AbstractLong2ObjectFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2ObjectMap

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

Methods inherited from interface it.unimi.dsi.fastutil.longs.Long2ObjectFunction

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

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

apply

Methods inherited from interface java.util.function.Function

andThen, identity

Methods inherited from interface java.util.Map

compute, computeIfAbsent, computeIfPresent, merge, putIfAbsent, remove, replace, replace, replaceAll

Field Detail

key

protected transient long[] key

The keys (valid up to size, excluded).

value

protected transient java.lang.Object[] value

The values (parallel to key).

size

protected int size

The number of valid entries in key and value.

entries

protected transient Long2ObjectMap.FastEntrySet<V> entries

Cached set of entries.

keys

protected transient it.unimi.dsi.fastutil.longs.LongSet keys

Cached set of keys.

values

protected transient it.unimi.dsi.fastutil.objects.ObjectCollection<V> values

Cached collection of values.

Constructor Detail

Long2ObjectArrayMap

public Long2ObjectArrayMap(long[] key,
                           java.lang.Object[] 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).

Long2ObjectArrayMap

public Long2ObjectArrayMap()

Creates a new empty array map.

Long2ObjectArrayMap

public Long2ObjectArrayMap(int capacity)

Creates a new empty array map of given capacity.

Parameters:

capacity - the initial capacity.

Long2ObjectArrayMap

public Long2ObjectArrayMap(Long2ObjectMap<V> m)

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

Parameters:

m - a map.

Long2ObjectArrayMap

public Long2ObjectArrayMap(java.util.Map<? extends java.lang.Long,? extends V> m)

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

Parameters:

m - a map.

Long2ObjectArrayMap

public Long2ObjectArrayMap(long[] key,
                           java.lang.Object[] 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 Detail

long2ObjectEntrySet

public Long2ObjectMap.FastEntrySet<V> long2ObjectEntrySet()

Description copied from interface: Long2ObjectMap

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:

long2ObjectEntrySet in interface Long2ObjectMap<V>

Returns:

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

See Also:

Map.entrySet()

get

public V get(long k)

Specified by:

get in interface it.unimi.dsi.fastutil.longs.Long2ObjectFunction<V>

size

public int size()

Description copied from interface: Long2ObjectMap

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 Long2ObjectMap<V>

Specified by:

size in interface java.util.Map<java.lang.Long,V>

Returns:

the number of key-value mappings in this map.

See Also:

Size64

clear

public void clear()

Description copied from interface: Long2ObjectMap

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

Specified by:

clear in interface Long2ObjectMap<V>

Specified by:

clear in interface java.util.Map<java.lang.Long,V>

containsKey

public boolean containsKey(long k)

Description copied from class: AbstractLong2ObjectMap

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

Specified by:

containsKey in interface it.unimi.dsi.fastutil.longs.Long2ObjectFunction<V>

Specified by:

containsKey in interface Long2ObjectMap<V>

Overrides:

containsKey in class AbstractLong2ObjectMap<V>

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

containsValue

public boolean containsValue(java.lang.Object v)

Description copied from class: AbstractLong2ObjectMap

Specified by:

containsValue in interface java.util.Map<java.lang.Long,V>

Overrides:

containsValue in class AbstractLong2ObjectMap<V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface java.util.Map<java.lang.Long,V>

Overrides:

isEmpty in class AbstractLong2ObjectMap<V>

put

public V put(long k,
             V v)

Specified by:

put in interface it.unimi.dsi.fastutil.longs.Long2ObjectFunction<V>

remove

public V remove(long k)

Specified by:

remove in interface it.unimi.dsi.fastutil.longs.Long2ObjectFunction<V>

keySet

public it.unimi.dsi.fastutil.longs.LongSet keySet()

Description copied from class: AbstractLong2ObjectMap

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 Long2ObjectMap<V>

Specified by:

keySet in interface java.util.Map<java.lang.Long,V>

Overrides:

keySet in class AbstractLong2ObjectMap<V>

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 it.unimi.dsi.fastutil.objects.ObjectCollection<V> values()

Description copied from class: AbstractLong2ObjectMap

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 Long2ObjectMap<V>

Specified by:

values in interface java.util.Map<java.lang.Long,V>

Overrides:

values in class AbstractLong2ObjectMap<V>

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 Long2ObjectArrayMap<V> 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 java.lang.Object

Returns:

a deep copy of this map.