CombinedMapView<K, V> class

Returns a new map that represents maps flattened into a single map.

All methods and accessors treat the new map as-if it were a single concatenated map, but the underlying implementation is based on lazily accessing individual map instances. In the occasion where a key occurs in multiple maps the first value is returned.

The resulting map has an index operator ([]) that is O(maps), rather than O(1), and the map is unmodifiable, but underlying changes to these maps are still accessible from the resulting map.

The length getter is O(M) where M is the total number of entries in all maps, since it has to remove duplicate entries.

Inheritance

Constructors

CombinedMapView(Iterable<Map<K, V>> _maps)
Create a new combined view of multiple maps. [...]

Properties

entries Iterable<MapEntry<K, V>>
The map entries of this.
read-only, inherited
hashCode int
The hash code for this object. [...]
read-only, inherited
isEmpty bool
Returns true if there is no key/value pair in the map.
read-only, inherited
isNotEmpty bool
Returns true if there is at least one key/value pair in the map.
read-only, inherited
keys Iterable<K>
The keys of this. [...]
read-only, override
length int
The number of key/value pairs in the map.
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
values Iterable<V>
The values of this. [...]
read-only, inherited

Methods

addAll(Map<K, V> other) → void
This operation is not supported by an unmodifiable map.
inherited
addEntries(Iterable<MapEntry<K, V>> entries) → void
This operation is not supported by an unmodifiable map.
inherited
cast<RK, RV>() Map<RK, RV>
Provides a view of this map as having RK keys and RV instances, if necessary. [...]
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
map<K2, V2>(MapEntry<K2, V2> transform(K key, V value)) Map<K2, V2>
Returns a new map where all entries of this map are transformed by the given f function.
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
removeWhere(bool test(K key, V value)) → void
This operation is not supported by an unmodifiable map.
inherited
toString() String
Returns a string representation of this object.
inherited
update(K key, V update(V value), {V ifAbsent()}) → V
This operation is not supported by an unmodifiable map.
inherited
updateAll(V update(K key, V value)) → void
This operation is not supported by an unmodifiable map.
inherited

Operators

operator ==(Object 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. [...]
override
operator []=(K key, V value) → void
This operation is not supported by an unmodifiable map.
inherited