it.unimi.dsi.fastutil.objects

Class Object2ObjectMaps.UnmodifiableMap<K,V>

java.lang.Object

it.unimi.dsi.fastutil.objects.AbstractObject2ObjectFunction<K,V>

it.unimi.dsi.fastutil.objects.Object2ObjectFunctions.UnmodifiableFunction<K,V>

it.unimi.dsi.fastutil.objects.Object2ObjectMaps.UnmodifiableMap<K,V>

All Implemented Interfaces:

Function<K,V>, Object2ObjectFunction<K,V>, Object2ObjectMap<K,V>, Serializable, Map<K,V>

Direct Known Subclasses:

Object2ObjectSortedMaps.UnmodifiableSortedMap

Enclosing class:

Object2ObjectMaps

public static class Object2ObjectMaps.UnmodifiableMap<K,V>
extends Object2ObjectFunctions.UnmodifiableFunction<K,V>
implements Object2ObjectMap<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.Object2ObjectMap

Object2ObjectMap.Entry<K,V>, Object2ObjectMap.FastEntrySet<K,V>

Method Summary

Methods

Modifier and Type	Method and Description
void	clear() Removes all associations from this function (optional operation).
boolean	containsKey(Object k) Returns true if this function contains a mapping for the specified key.
boolean	containsValue(Object v)
V	defaultReturnValue() Gets the default return value.
void	defaultReturnValue(V defRetValue) Sets the default return value.
ObjectSet<Map.Entry<K,V>>	entrySet() Returns a set view of the mappings contained in this map.
V	get(Object k) Returns the value associated by this function to the specified key.
boolean	isEmpty()
ObjectSet<K>	keySet() Returns a set view of the keys contained in this map.
ObjectSet<Object2ObjectMap.Entry<K,V>>	object2ObjectEntrySet() Returns a type-specific set view of the mappings contained in this map.
V	put(K k, V v) Associates the specified value with the specified key in this function (optional operation).
void	putAll(Map<? extends K,? extends V> m)
V	remove(Object k) Removes this key and the associated value from this function if it is present (optional operation).
int	size() Returns the intended number of keys in this function, or -1 if no such number exists.
String	toString()
ObjectCollection<V>	values() Returns a set view of the values contained in this map.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface java.util.Map

equals, hashCode

Method Detail

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.

Specified by:

size in interface Function<K,V>

Specified by:

size in interface Map<K,V>

Overrides:

size in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Returns:

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

containsKey

public boolean containsKey(Object k)

Description copied from interface: Function

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.

Specified by:

containsKey in interface Function<K,V>

Specified by:

containsKey in interface Map<K,V>

Overrides:

containsKey in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Parameters:

k - the key.

Returns:

true if this function associates a value to key.

See Also:

Map.containsKey(Object)

containsValue

public boolean containsValue(Object v)

Specified by:

containsValue in interface Map<K,V>

defaultReturnValue

public V defaultReturnValue()

Description copied from interface: Object2ObjectFunction

Gets the default return value.

Specified by:

defaultReturnValue in interface Object2ObjectFunction<K,V>

Overrides:

defaultReturnValue in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Returns:

the current default return value.

defaultReturnValue

public void defaultReturnValue(V defRetValue)

Description copied from interface: Object2ObjectFunction

Sets the default return value. This value must be returned by type-specific versions of get(), put() and remove() to denote that the map does not contain the specified key. It must be 0/false/null by default.

Specified by:

defaultReturnValue in interface Object2ObjectFunction<K,V>

Overrides:

defaultReturnValue in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Parameters:

defRetValue - the new default return value.

See Also:

Object2ObjectFunction.defaultReturnValue()

put

public V put(K k,
    V v)

Description copied from interface: Function

Associates the specified value with the specified key in this function (optional operation).

Specified by:

put in interface Function<K,V>

Specified by:

put in interface Map<K,V>

Overrides:

put in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Parameters:

k - the key.

v - the value.

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.put(Object,Object)

putAll

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

Specified by:

putAll in interface Map<K,V>

object2ObjectEntrySet

public ObjectSet<Object2ObjectMap.Entry<K,V>> object2ObjectEntrySet()

Description copied from interface: Object2ObjectMap

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 Object2ObjectMap.entrySet() so that it returns an ObjectSet of objects of type Map.Entry (the latter makes it possible to access keys and values with type-specific methods).

Specified by:

object2ObjectEntrySet in interface Object2ObjectMap<K,V>

Returns:

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

See Also:

Object2ObjectMap.entrySet()

keySet

public ObjectSet<K> keySet()

Description copied from interface: Object2ObjectMap

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

Note that this specification strengthens the one given in Map.keySet().

Specified by:

keySet in interface Object2ObjectMap<K,V>

Specified by:

keySet in interface Map<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: Object2ObjectMap

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

Note that this specification strengthens the one given in Map.values().

Specified by:

values in interface Object2ObjectMap<K,V>

Specified by:

values in interface Map<K,V>

Returns:

a set view of the values contained in this map.

See Also:

Map.values()

clear

public void clear()

Description copied from interface: Function

Removes all associations from this function (optional operation).

Specified by:

clear in interface Function<K,V>

Specified by:

clear in interface Map<K,V>

Overrides:

clear in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

See Also:

Map.clear()

toString

public String toString()

Overrides:

toString in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

remove

public V remove(Object k)

Description copied from interface: Function

Removes this key and the associated value from this function if it is present (optional operation).

Specified by:

remove in interface Function<K,V>

Specified by:

remove in interface Map<K,V>

Overrides:

remove in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Returns:

the old value, or null if no value was present for the given key.

See Also:

Map.remove(Object)

get

public V get(Object k)

Description copied from interface: Function

Returns the value associated by this function to the specified key.

Specified by:

get in interface Function<K,V>

Specified by:

get in interface Map<K,V>

Overrides:

get in class Object2ObjectFunctions.UnmodifiableFunction<K,V>

Parameters:

k - the key.

Returns:

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

See Also:

Map.get(Object)

isEmpty

public boolean isEmpty()

Specified by:

isEmpty in interface Map<K,V>

entrySet

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

Description copied from interface: Object2ObjectMap

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

Note that this specification strengthens the one given in Map.entrySet().

Specified by:

entrySet in interface Object2ObjectMap<K,V>

Specified by:

entrySet in interface Map<K,V>

Returns:

a set view of the mappings contained in this map.

See Also:

Map.entrySet()