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.

Inheritance

Constructors

UnmodifiableMapBase()

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

Operators

operator ==(other) bool

The equality operator.

inherited
operator [](Object key) → V

Returns the value for the given key or null if key is not in the map.

inherited
operator []=(K key, V value) → void

This operation is not supported by an unmodifiable map.

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 f to 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