Class Byte2ObjectArrayMap<V>

java.lang.Object

it.unimi.dsi.fastutil.bytes.AbstractByte2ObjectFunction<V>

it.unimi.dsi.fastutil.bytes.AbstractByte2ObjectMap<V>

it.unimi.dsi.fastutil.bytes.Byte2ObjectArrayMap<V>

All Implemented Interfaces:

Byte2ObjectFunction<V>, Byte2ObjectMap<V>, Function<Byte,V>, Serializable, Cloneable, Function<Byte,V>, IntFunction<V>, Map<Byte,V>

public class Byte2ObjectArrayMap<V>
extends AbstractByte2ObjectMap<V>
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.bytes.AbstractByte2ObjectMap

AbstractByte2ObjectMap.BasicEntry<V>, AbstractByte2ObjectMap.BasicEntrySet<V>

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ObjectMap

Byte2ObjectMap.Entry<V>, Byte2ObjectMap.FastEntrySet<V>

Constructor Summary

Constructors

Constructor	Description
Byte2ObjectArrayMap()	Creates a new empty array map.
Byte2ObjectArrayMap(byte[] key, Object[] value)	Creates a new empty array map with given key and value backing arrays.
Byte2ObjectArrayMap(byte[] key, Object[] value, int size)	Creates a new array map with given key and value backing arrays, using the given number of elements.
Byte2ObjectArrayMap(int capacity)	Creates a new empty array map of given capacity.
Byte2ObjectArrayMap(Byte2ObjectMap<V> m)	Creates a new empty array map copying the entries of a given map.
Byte2ObjectArrayMap(Map<? extends Byte, ? extends V> m)	Creates a new empty array map copying the entries of a given map.

Method Summary

Modifier and Type	Method	Description
Byte2ObjectMap.FastEntrySet<V>	byte2ObjectEntrySet()	Returns a type-specific set view of the mappings contained in this map.
void	clear()	Removes all associations from this function (optional operation).
Byte2ObjectArrayMap<V>	clone()	Returns a deep copy of this map.
boolean	containsKey(byte k)	Returns true if this function contains a mapping for the specified key.
boolean	containsValue(Object v)
V	get(byte k)	Returns the value to which the given key is mapped.
boolean	isEmpty()
ByteSet	keySet()	Returns a type-specific-set view of the keys of this map.
V	put(byte k, V v)	Adds a pair to the map (optional operation).
V	remove(byte k)	Removes the mapping with the given key (optional operation).
int	size()	Returns the intended number of keys in this function, or -1 if no such number exists.
ObjectCollection<V>	values()	Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ObjectMap

equals, hashCode, putAll, toString

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2ObjectFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2ObjectFunction

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.bytes.Byte2ObjectMap

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

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

apply

Methods inherited from interface java.util.function.Function

andThen

Methods inherited from interface java.util.Map

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

Constructor Details

Byte2ObjectArrayMap

public Byte2ObjectArrayMap(byte[] key,
 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).

Byte2ObjectArrayMap

public Byte2ObjectArrayMap()

Creates a new empty array map.

Byte2ObjectArrayMap

public Byte2ObjectArrayMap(int capacity)

Creates a new empty array map of given capacity.

Parameters:

capacity - the initial capacity.

Byte2ObjectArrayMap

public Byte2ObjectArrayMap(Byte2ObjectMap<V> m)

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

Parameters:

m - a map.

Byte2ObjectArrayMap

public Byte2ObjectArrayMap(Map<? extends Byte, ? extends V> m)

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

Parameters:

m - a map.

Byte2ObjectArrayMap

public Byte2ObjectArrayMap(byte[] key,
 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 Details

byte2ObjectEntrySet

public Byte2ObjectMap.FastEntrySet<V> byte2ObjectEntrySet()

Description copied from interface: Byte2ObjectMap

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:

byte2ObjectEntrySet in interface Byte2ObjectMap<V>

Returns:

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

See Also:

• Map.entrySet()

get

public V get(byte k)

Description copied from interface: Byte2ObjectFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Byte2ObjectFunction<V>

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. This default implementation, in particular, returns -1.

Specified by:

size in interface Byte2ObjectMap<V>

Specified by:

size in interface Function<Byte,V>

Specified by:

size in interface Map<Byte,V>

Returns:

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

See Also:

• Size64

clear

public void clear()

Description copied from interface: Function

Removes all associations from this function (optional operation).

Specified by:

clear in interface Byte2ObjectMap<V>

Specified by:

clear in interface Function<Byte,V>

Specified by:

clear in interface Map<Byte,V>

See Also:

• Map.clear()

containsKey

public boolean containsKey(byte k)

Description copied from class: AbstractByte2ObjectMap

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

Note that for some kind of functions (e.g., hashes) this method will always return true. In particular, this default implementation always returns true.

Specified by:

containsKey in interface Byte2ObjectFunction<V>

Specified by:

containsKey in interface Byte2ObjectMap<V>

Overrides:

containsKey in class AbstractByte2ObjectMap<V>

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

• Function.containsKey(Object)

containsValue

public boolean containsValue(Object v)

Description copied from class: AbstractByte2ObjectMap

Specified by:

containsValue in interface Map<Byte,V>

Overrides:

containsValue in class AbstractByte2ObjectMap<V>

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Byte,V>

Overrides:

isEmpty in class AbstractByte2ObjectMap<V>

put

public V put(byte k,
 V v)

Description copied from interface: Byte2ObjectFunction

Adds a pair to the map (optional operation).

Specified by:

put in interface Byte2ObjectFunction<V>

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 V remove(byte k)

Description copied from interface: Byte2ObjectFunction

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

Specified by:

remove in interface Byte2ObjectFunction<V>

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 ByteSet keySet()

Description copied from class: AbstractByte2ObjectMap

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 Byte2ObjectMap<V>

Specified by:

keySet in interface Map<Byte,V>

Overrides:

keySet in class AbstractByte2ObjectMap<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 ObjectCollection<V> values()

Description copied from class: AbstractByte2ObjectMap

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 Byte2ObjectMap<V>

Specified by:

values in interface Map<Byte,V>

Overrides:

values in class AbstractByte2ObjectMap<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 Byte2ObjectArrayMap<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.

Returns:

a deep copy of this map.