dart:collection
UnmodifiableMapBase<K, V> class
Basic implementation of an unmodifiable Map.
This class has a basic implementation of all but two of the members of an unmodifiable Map. A simple unmodifiable Map class can be implemented by extending this class and implementing keys and operator[].
Modifying operations throw when used. The remaining non-modifying operations are implemented in terms of keys and operator[].
The keys iterable should have efficient Iterable.length and Iterable.contains operations, and it should catch concurrent modifications of the keys while iterating.
A more efficient implementation is usually possible by overriding some of the other members as well.
- Inheritance
-
Constructors
- UnmodifiableMapBase()
Properties
- entries → Iterable<MapEntry<K, V>>
read-only, inherited
- The map entries of this.
- hashCode → int
read-only, inherited
- The hash code for this object.
- isEmpty → bool
read-only, inherited
- Whether there is no key/value pair in the map.
- isNotEmpty → bool
read-only, inherited
- Whether there is at least one key/value pair in the map.
- keys → Iterable<K>
read-only, inherited
- The keys of this.
- length → int
read-only, inherited
- The number of key/value pairs in the map.
- runtimeType → Type
read-only, inherited
- A representation of the runtime type of the object.
- values → Iterable<V>
read-only, inherited
- The values of this.
Methods
- addAll(Map<K, V> other) → void
inherited
- This operation is not supported by an unmodifiable map.
- addEntries(Iterable<MapEntry<K, V>> entries) → void
inherited
- This operation is not supported by an unmodifiable map.
- cast<RK, RV>() → Map<RK, RV>
inherited
- Provides a view of this map as having
RK keys and RV instances, if necessary. - clear() → void
inherited
- This operation is not supported by an unmodifiable map.
- containsKey(Object? key) → bool
inherited
- Whether this map contains the given
key. - containsValue(Object? value) → bool
inherited
- Whether this map contains the given
value. - forEach(void action(K key, V value)) → void
inherited
- Applies
action to each key/value pair of the map. - map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) → Map<K2, V2>
inherited
- Returns a new map where all entries of this map are transformed by the given
convert function. - noSuchMethod(Invocation invocation) → dynamic
inherited
- Invoked when a non-existent method or property is accessed.
- putIfAbsent(K key, V ifAbsent()) → V
inherited
- This operation is not supported by an unmodifiable map.
- remove(Object? key) → V?
inherited
- This operation is not supported by an unmodifiable map.
- removeWhere(bool test(K key, V value)) → void
inherited
- This operation is not supported by an unmodifiable map.
- toString() → String
inherited
- A string representation of this object.
- update(K key, V update(V value), {V ifAbsent()?}) → V
inherited
- This operation is not supported by an unmodifiable map.
- updateAll(V update(K key, V value)) → void
inherited
- This operation is not supported by an unmodifiable map.
Operators
- operator ==(Object other) → bool
inherited
- The equality operator.
- operator [](Object? key) → V?
inherited
- The value for the given
key, or null if key is not in the map. - operator []=(K key, V value) → void
inherited
- This operation is not supported by an unmodifiable map.