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
-
Get a 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
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 -
Associates the
keywith the givenvalue.…inherited
Methods
-
addAll(
Map<K, V> other) → void -
Adds all key-value pairs of
otherto this map.…inherited -
clear(
) → void -
Removes all pairs from the 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 -
Look up the value of
key, or add a new value if it isn't there.…inherited -
remove(
Object key) → V -
Removes
keyand its associated value, if present, from the map.…inherited -
toString(
) → String -
Returns a string representation of this object.
inherited