Package it.unimi.dsi.fastutil.objects

Class Reference2ObjectMaps.UnmodifiableMap<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractReference2ObjectFunction<K,V>

it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.UnmodifiableFunction<K,V>

it.unimi.dsi.fastutil.objects.Reference2ObjectMaps.UnmodifiableMap<K,V>

All Implemented Interfaces:

Function<K,V>, Reference2ObjectFunction<K,V>, Reference2ObjectMap<K,V>, Serializable, Function<K,V>, Map<K,V>

Direct Known Subclasses:

Reference2ObjectSortedMaps.UnmodifiableSortedMap

Enclosing class:

Reference2ObjectMaps

public static class Reference2ObjectMaps.UnmodifiableMap<K,V>
extends Reference2ObjectFunctions.UnmodifiableFunction<K,V>
implements Reference2ObjectMap<K,V>, Serializable

An unmodifiable wrapper class for maps.

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap

Reference2ObjectMap.Entry<K,V>, Reference2ObjectMap.FastEntrySet<K,V>

Method Summary

Modifier and Type	Method	Description
V	compute(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)	Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).
V	computeIfPresent(K key, BiFunction<? super K,? super V,? extends V> remappingFunction)	If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.
boolean	containsValue(Object v)
ObjectSet<Map.Entry<K,V>>	entrySet()	Returns a set view of the mappings contained in this map.
boolean	equals(Object o)
void	forEach(BiConsumer<? super K,? super V> action)
V	getOrDefault(Object key, V defaultValue)	Returns the value associated by this function to the specified key, or give the specified value if not present.
int	hashCode()
boolean	isEmpty()
ReferenceSet<K>	keySet()
V	merge(K key, V value, BiFunction<? super V,? super V,? extends V> remappingFunction)	If the specified key is not already associated with a value, associates it with the given value.
void	putAll(Map<? extends K,? extends V> m)
V	putIfAbsent(K key, V value)	If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.
ObjectSet<Reference2ObjectMap.Entry<K,V>>	reference2ObjectEntrySet()	Returns a type-specific set view of the mappings contained in this map.
boolean	remove(Object key, Object value)	Removes the entry for the specified key only if it is currently mapped to the specified value.
V	replace(K key, V value)	Replaces the entry for the specified key only if it is currently mapped to some value.
boolean	replace(K key, V oldValue, V newValue)	Replaces the entry for the specified key only if currently mapped to the specified value.
void	replaceAll(BiFunction<? super K,? super V,? extends V> function)
ObjectCollection<V>	values()

Methods inherited from class it.unimi.dsi.fastutil.objects.Reference2ObjectFunctions.UnmodifiableFunction

clear, containsKey, defaultReturnValue, defaultReturnValue, get, put, remove, size, toString

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

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

apply

Methods inherited from interface java.util.function.Function

andThen, compose

Methods inherited from interface java.util.Map

computeIfAbsent, get

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectFunction

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

Methods inherited from interface it.unimi.dsi.fastutil.objects.Reference2ObjectMap

clear, computeIfAbsent, computeObjectIfAbsentPartial, containsKey, defaultReturnValue, defaultReturnValue, put, remove, size

Method Details

containsValue

public boolean containsValue(Object v)

Specified by:

containsValue in interface Map<K,V>

putAll

public void putAll(Map<? extends K,? extends V> m)

Specified by:

putAll in interface Map<K,V>

reference2ObjectEntrySet

public ObjectSet<Reference2ObjectMap.Entry<K,V>> reference2ObjectEntrySet()

Description copied from interface: Reference2ObjectMap

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:

reference2ObjectEntrySet in interface Reference2ObjectMap<K,V>

Returns:

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

See Also:

• Map.entrySet()

entrySet

public ObjectSet<Map.Entry<K,V>> entrySet()

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

Specified by:

entrySet in interface Map<K,V>

Specified by:

entrySet in interface Reference2ObjectMap<K,V>

Returns:

a set view of the mappings contained in this map.

See Also:

• Map.entrySet()

keySet

public ReferenceSet<K> keySet()

Description copied from interface: Reference2ObjectMap

Specified by:

keySet in interface Map<K,V>

Specified by:

keySet in interface Reference2ObjectMap<K,V>

Returns:

a set view of the keys contained in this map.

See Also:

• Map.keySet()

values

public ObjectCollection<V> values()

Description copied from interface: Reference2ObjectMap

Specified by:

values in interface Map<K,V>

Specified by:

values in interface Reference2ObjectMap<K,V>

Returns:

a set view of the values contained in this map.

See Also:

• Map.values()

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

hashCode

public int hashCode()

Specified by:

hashCode in interface Map<K,V>

Overrides:

hashCode in class Reference2ObjectFunctions.UnmodifiableFunction<K,V>

equals

public boolean equals(Object o)

Specified by:

equals in interface Map<K,V>

Overrides:

equals in class Reference2ObjectFunctions.UnmodifiableFunction<K,V>

getOrDefault

public V getOrDefault(Object key,
 V defaultValue)

Description copied from interface: Reference2ObjectFunction

Returns the value associated by this function to the specified key, or give the specified value if not present.

Specified by:

getOrDefault in interface Function<K,V>

Specified by:

getOrDefault in interface Map<K,V>

Specified by:

getOrDefault in interface Reference2ObjectFunction<K,V>

Specified by:

getOrDefault in interface Reference2ObjectMap<K,V>

Overrides:

getOrDefault in class Reference2ObjectFunctions.UnmodifiableFunction<K,V>

Parameters:

key - the key.

defaultValue - the value to return if not present.

Returns:

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

See Also:

• Function.getOrDefault(Object, Object)

forEach

public void forEach(BiConsumer<? super K,? super V> action)

Specified by:

forEach in interface Map<K,V>

Specified by:

forEach in interface Reference2ObjectMap<K,V>

replaceAll

public void replaceAll(BiFunction<? super K,? super V,? extends V> function)

Specified by:

replaceAll in interface Map<K,V>

putIfAbsent

public V putIfAbsent(K key,
 V value)

Description copied from interface: Reference2ObjectMap

If the specified key is not already associated with a value, associates it with the given value and returns the default return value, else returns the current value.

Specified by:

putIfAbsent in interface Map<K,V>

Specified by:

putIfAbsent in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is to be associated.

value - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

See Also:

• Map.putIfAbsent(Object, Object)

remove

public boolean remove(Object key,
 Object value)

Description copied from interface: Reference2ObjectMap

Removes the entry for the specified key only if it is currently mapped to the specified value.

Specified by:

remove in interface Map<K,V>

Specified by:

remove in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is associated.

value - value expected to be associated with the specified key.

Returns:

true if the value was removed.

See Also:

• Map.remove(Object, Object)

replace

public V replace(K key,
 V value)

Description copied from interface: Reference2ObjectMap

Replaces the entry for the specified key only if it is currently mapped to some value.

Specified by:

replace in interface Map<K,V>

Specified by:

replace in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is associated.

value - value to be associated with the specified key.

Returns:

the previous value associated with the specified key, or the default return value if there was no mapping for the key.

See Also:

• Map.replace(Object, Object)

replace

public boolean replace(K key,
 V oldValue,
 V newValue)

Description copied from interface: Reference2ObjectMap

Replaces the entry for the specified key only if currently mapped to the specified value.

Specified by:

replace in interface Map<K,V>

Specified by:

replace in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is associated.

oldValue - value expected to be associated with the specified key.

newValue - value to be associated with the specified key.

Returns:

true if the value was replaced.

See Also:

• Map.replace(Object, Object, Object)

computeIfPresent

public V computeIfPresent(K key,
 BiFunction<? super K,? super V,? extends V> remappingFunction)

Description copied from interface: Reference2ObjectMap

If the value for the specified key is present, attempts to compute a new mapping given the key and its current mapped value.

Specified by:

computeIfPresent in interface Map<K,V>

Specified by:

computeIfPresent in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

See Also:

• Map.computeIfPresent(Object, java.util.function.BiFunction)

compute

public V compute(K key,
 BiFunction<? super K,? super V,? extends V> remappingFunction)

Description copied from interface: Reference2ObjectMap

Attempts to compute a mapping for the specified key and its current mapped value (or null if there is no current mapping).

If the function returns null, the mapping is removed (or remains absent if initially absent). If the function itself throws an (unchecked) exception, the exception is rethrown, and the current mapping is left unchanged.

Specified by:

compute in interface Map<K,V>

Specified by:

compute in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the specified value is to be associated.

remappingFunction - the function to compute a value.

Returns:

the new value associated with the specified key, or the default return value if none.

See Also:

• Map.compute(Object, java.util.function.BiFunction)

merge

public V merge(K key,
 V value,
 BiFunction<? super V,? super V,? extends V> remappingFunction)

Description copied from interface: Reference2ObjectMap

If the specified key is not already associated with a value, associates it with the given value. Otherwise, replaces the associated value with the results of the given remapping function, or removes if the result is null.

Specified by:

merge in interface Map<K,V>

Specified by:

merge in interface Reference2ObjectMap<K,V>

Parameters:

key - key with which the resulting value is to be associated.

value - the value to be merged with the existing value associated with the key or, if no existing value is associated with the key, to be associated with the key.

remappingFunction - the function to recompute a value if present.

Returns:

the new value associated with the specified key, or the default return value if no value is associated with the key.

See Also:

• Map.merge(Object, Object, java.util.function.BiFunction)