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.
Constructors
Properties
- hashCode → int
-
The hash code for this object. [...]
read-only, inherited
- isEmpty → bool
-
read-only, inherited
- isNotEmpty → bool
-
read-only, inherited
- keys → Iterable<K>
-
read-only, inherited
- length → int
-
read-only, inherited
- runtimeType → Type
-
A representation of the runtime type of the object.
read-only, inherited
- values → Iterable<V>
-
read-only, inherited
Methods
-
addAll(
Map<K, V> other) → void -
This operation is not supported by an unmodifiable map.
inherited
-
clear(
) → void -
This operation is not supported by an unmodifiable map.
inherited
-
containsKey(
Object key) → bool -
Returns true if this map contains the given
key. [...]inherited -
containsValue(
Object value) → bool -
Returns true if this map contains the given
value. [...]inherited -
forEach(
void action(K key, V value)) → void -
Applies
fto each key-value pair of the map. [...]inherited -
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a non-existent method or property is accessed. [...]
inherited
-
putIfAbsent(
K key, V ifAbsent()) → V -
This operation is not supported by an unmodifiable map.
inherited
-
remove(
Object key) → V -
This operation is not supported by an unmodifiable map.
inherited
-
toString(
) → String -
Returns a string representation of this object.
inherited
Operators
-
operator ==(
other) → bool -
The equality operator. [...]
inherited
-
operator [](
Object key) → V -
Returns the value for the given
keyor null ifkeyis not in the map. [...]inherited -
operator []=(
K key, V value) → void -
This operation is not supported by an unmodifiable map.
inherited