Class Byte2BooleanArrayMap

java.lang.Object

it.unimi.dsi.fastutil.bytes.AbstractByte2BooleanFunction

it.unimi.dsi.fastutil.bytes.AbstractByte2BooleanMap

it.unimi.dsi.fastutil.bytes.Byte2BooleanArrayMap

All Implemented Interfaces:

Byte2BooleanFunction, Byte2BooleanMap, Function<Byte,Boolean>, Serializable, Cloneable, Function<Byte,Boolean>, IntPredicate, Map<Byte,Boolean>

public class Byte2BooleanArrayMap
extends AbstractByte2BooleanMap
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.AbstractByte2BooleanMap

AbstractByte2BooleanMap.BasicEntry, AbstractByte2BooleanMap.BasicEntrySet

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.bytes.Byte2BooleanMap

Byte2BooleanMap.Entry, Byte2BooleanMap.FastEntrySet

Constructor Summary

Constructors

Constructor	Description
Byte2BooleanArrayMap()	Creates a new empty array map.
Byte2BooleanArrayMap(byte[] key, boolean[] value)	Creates a new empty array map with given key and value backing arrays.
Byte2BooleanArrayMap(byte[] key, boolean[] value, int size)	Creates a new array map with given key and value backing arrays, using the given number of elements.
Byte2BooleanArrayMap(int capacity)	Creates a new empty array map of given capacity.
Byte2BooleanArrayMap(Byte2BooleanMap m)	Creates a new empty array map copying the entries of a given map.
Byte2BooleanArrayMap(Map<? extends Byte, ? extends Boolean> m)	Creates a new empty array map copying the entries of a given map.

Method Summary

Modifier and Type	Method	Description
Byte2BooleanMap.FastEntrySet	byte2BooleanEntrySet()	Returns a type-specific set view of the mappings contained in this map.
void	clear()	Removes all associations from this function (optional operation).
Byte2BooleanArrayMap	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(boolean v)	Returns true if this map maps one or more keys to the specified value.
boolean	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.
boolean	put(byte k, boolean v)	Adds a pair to the map (optional operation).
boolean	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.
BooleanCollection	values()	Returns a type-specific-set view of the values of this map.

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2BooleanMap

equals, hashCode, putAll, toString

Methods inherited from class it.unimi.dsi.fastutil.bytes.AbstractByte2BooleanFunction

defaultReturnValue, defaultReturnValue

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2BooleanFunction

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

Methods inherited from interface it.unimi.dsi.fastutil.bytes.Byte2BooleanMap

compute, computeIfAbsent, computeIfAbsent, computeIfAbsentNullable, computeIfAbsentPartial, computeIfPresent, containsKey, containsValue, 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.IntPredicate

and, negate, or

Methods inherited from interface java.util.Map

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

Constructor Details

Byte2BooleanArrayMap

public Byte2BooleanArrayMap(byte[] key,
 boolean[] 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).

Byte2BooleanArrayMap

public Byte2BooleanArrayMap()

Creates a new empty array map.

Byte2BooleanArrayMap

public Byte2BooleanArrayMap(int capacity)

Creates a new empty array map of given capacity.

Parameters:

capacity - the initial capacity.

Byte2BooleanArrayMap

public Byte2BooleanArrayMap(Byte2BooleanMap m)

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

Parameters:

m - a map.

Byte2BooleanArrayMap

public Byte2BooleanArrayMap(Map<? extends Byte, ? extends Boolean> m)

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

Parameters:

m - a map.

Byte2BooleanArrayMap

public Byte2BooleanArrayMap(byte[] key,
 boolean[] 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

byte2BooleanEntrySet

public Byte2BooleanMap.FastEntrySet byte2BooleanEntrySet()

Description copied from interface: Byte2BooleanMap

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:

byte2BooleanEntrySet in interface Byte2BooleanMap

Returns:

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

See Also:

• Map.entrySet()

get

public boolean get(byte k)

Description copied from interface: Byte2BooleanFunction

Returns the value to which the given key is mapped.

Specified by:

get in interface Byte2BooleanFunction

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 Byte2BooleanMap

Specified by:

size in interface Function<Byte,Boolean>

Specified by:

size in interface Map<Byte,Boolean>

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 Byte2BooleanMap

Specified by:

clear in interface Function<Byte,Boolean>

Specified by:

clear in interface Map<Byte,Boolean>

See Also:

• Map.clear()

containsKey

public boolean containsKey(byte k)

Description copied from class: AbstractByte2BooleanMap

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 Byte2BooleanFunction

Specified by:

containsKey in interface Byte2BooleanMap

Overrides:

containsKey in class AbstractByte2BooleanMap

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

• Function.containsKey(Object)

containsValue

public boolean containsValue(boolean v)

Description copied from class: AbstractByte2BooleanMap

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

Specified by:

containsValue in interface Byte2BooleanMap

Overrides:

containsValue in class AbstractByte2BooleanMap

See Also:

• Map.containsValue(Object)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<Byte,Boolean>

Overrides:

isEmpty in class AbstractByte2BooleanMap

put

public boolean put(byte k,
 boolean v)

Description copied from interface: Byte2BooleanFunction

Adds a pair to the map (optional operation).

Specified by:

put in interface Byte2BooleanFunction

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 boolean remove(byte k)

Description copied from interface: Byte2BooleanFunction

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

Specified by:

remove in interface Byte2BooleanFunction

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: AbstractByte2BooleanMap

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 Byte2BooleanMap

Specified by:

keySet in interface Map<Byte,Boolean>

Overrides:

keySet in class AbstractByte2BooleanMap

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 BooleanCollection values()

Description copied from class: AbstractByte2BooleanMap

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 Byte2BooleanMap

Specified by:

values in interface Map<Byte,Boolean>

Overrides:

values in class AbstractByte2BooleanMap

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 Byte2BooleanArrayMap 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.