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 umodifiable 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
- Returns true if there is no key/value pair in the map.
- isNotEmpty → bool
read-only, inherited
- Returns true if 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
- Returns true if this map contains the given
key. [...] - containsValue(Object value) → bool
inherited
- Returns true if this map contains the given
value. [...] - forEach(void action(K key, V value)) → void
inherited
- Applies
f 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
f 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
- Returns 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 ==(dynamic other) → bool
inherited
- The equality operator. [...]
- operator [](Object key) → V
inherited
- Returns 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.