UnmodifiableMapBase abstract 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 length and 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.
Constructors
Properties
- hashCode → int read-only, inherited
-
The hash code for this object.
- isEmpty → bool read-only, inherited
- isNotEmpty → bool read-only, inherited
- keys → Iterable<K> read-only, inherited
- length → int read-only, inherited
- runtimeType → Type read-only, inherited
-
A representation of the runtime type of the object.
- values → Iterable<V> read-only, inherited
Operators
- operator ==(
other) → bool inherited -
The equality operator.
- operator [](
Object key) → V inherited -
Returns the value for the given
keyor null ifkeyis not in the map. - operator []=(
K key, V value) → void inherited -
This operation is not supported by an unmodifiable map.
Methods
- addAll(
Map<K, V> other) → void inherited -
This operation is not supported by an unmodifiable map.
- 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
fto each key-value pair of the map. - 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.
- toString(
) → String inherited -
Returns a string representation of this object.
© 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dartlang.org/stable/1.24.3/dart-collection/UnmodifiableMapBase-class.html