TreeReferenceMap<K, V> class

A Map that keeps keys that are in the tree of root.

Since Dart doesn't have Weak References, one way to avoid memory bloat is to ensure that the key is in the tree of objects that you are managing.

Browser: one useful way is to use with document (the root of DOM), and be able to associate values with any Node in DOM tree.

Implemented types
Implementers
Available Extensions

Constructors

TreeReferenceMap(K root, {bool autoPurge = false, bool keepPurgedKeys = false, Duration? purgedEntriesTimeout, int? maxPurgedEntries, K? parentGetter(K key)?, Iterable<K> childrenGetter(K key)?, bool childChecker(K parent, K child, bool deep)?})

Properties

autoPurge → bool
If true, each operation performs a purge.
final
childChecker → (bool Function(K parent, K child, bool deep)?)
The Function that returns true if parent has child.
final
childrenGetter → (Iterable<K> Function(K key)?)
The Function that returns the children of a key.
final
entries → Iterable<MapEntry<K, V>>
The map entries of this.
no setteroverride
hashCode → int
The hash code for this object.
no setterinherited
invalidEntries → List<MapEntry<K, V>>
Returns the invalid entries.
no setter
invalidKeys → List<K>
Returns the invalid keys.
no setter
isEmpty → bool
Whether there is no key/value pair in the map.
no setteroverride
isNotEmpty → bool
Whether there is at least one key/value pair in the map.
no setteroverride
keepPurgedEntries → bool
Will stored purged entries in a separated Map.
final
keys → Iterable<K>
The keys of this.
no setteroverride
keysReversed → List<K>
Returns keys reversed (unmodifiable);
no setter
length → int
The number of key/value pairs in the map.
no setteroverride
maxPurgedEntries → int?
Maximum number of purged entries.
final
parentGetter → (K? Function(K key)?)
The Function that returns the parent of a key.
final
purgedEntries → List<MapEntry<K, V>>
Returns the purged entries. Only relevant if keepPurgedEntries is true.
no setter
purgedEntriesCount → int
no setter
purgedEntriesTimeout → Duration?
Purged entries timeout.
final
purgedKeys → List<K>
Returns the purged keys. Only relevant if keepPurgedEntries is true.
no setter
purgedKeysReversed → List<K>
Returns purgedKeys reversed (unmodifiable);
no setter
purgedLength → int
Returns the purged entries length. Only relevant if keepPurgedEntries is true.
no setter
revalidatedPurgedEntriesCount → int
no setter
root → K
The root of the Tree Reference.
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
validEntries → List<MapEntry<K, V>>
Returns the valid entries.
no setter
validKeys → List<K>
Returns the valid keys.
no setter
values → Iterable<V>
The values of this.
no setteroverride

Methods

addAll(Map<K, V> other) → void
Adds all key/value pairs of other to this map.
override
addEntries(Iterable<MapEntry<K, V>> newEntries) → void
Adds all key/value pairs of newEntries to this map.
override
cast<RK, RV>() → Map<RK, RV>
Provides a view of this map as having RK keys and RV instances, if necessary.
override
checkPurgedEntriesTimeout() → void
Remove expired purged entries. Only relevant if purgedEntriesTimeout is not null.
checkPurgeEntriesLimit() → void
Removed purged entries over maxPurgedEntries limit.
clear() → void
Removes all entries from the map.
override
containsKey(Object? key) → bool
Whether this map contains the given key.
override
containsValue(Object? value) → bool
Whether this map contains the given value.
override
disposePurgedEntries() → void
Disposes purged entries. Only relevant if keepPurgedEntries is true.
doAutoPurge() → void
Same as purge, but called automatically by many operations.
forEach(void f(K key, V value)) → void
Applies action to each key/value pair of the map.
override
get(K key) → V?
getAlsoFromPurgedEntries(K key) → V?
getChildrenOf(K? key) → Iterable<K>
Returns the children of key.
getFromPurgedEntries(K? key) → V?
Returns key value from purged entries. Only relevant if keepPurgedEntries is true.
getParentKey(K? child, {bool includePurgedEntries = false}) → K?
Get 1st parent key of child;
getParentOf(K? key) → K?
Returns the parent of key.
getParentValue(K? child, {bool includePurgedEntries = false}) → V?
Get 1st parent value of child;
getSubValues(K? key, {bool includePurgedEntries = false}) → List<V>
Return sub values of key.
isChildOf(K? parent, K? child, bool deep) → bool
Returns true if parent has child. If deep is true, will check sub nodes children.
isInTree(K? key) → bool
Returns true if key is in the tree.
isValidEntry(K key, V value) → bool
Returns true if key is valid (in the tree).
map<K2, V2>(MapEntry<K2, V2> f(K key, V value)) → Map<K2, V2>
Returns a new map where all entries of this map are transformed by the given convert function.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
purge() → TreeReferenceMap<K, V>
Remove all invalidKeys.
put(K key, V value) → void
putIfAbsent(K key, V ifAbsent()) → V
Look up the value of key, or add a new entry if it isn't there.
override
remove(Object? key) → V?
Removes key and its associated value, if present, from the map.
override
removeWhere(bool predicate(K key, V value)) → void
Removes all entries of this map that satisfy the given test.
override
revalidatePurgedEntries() → int
Restore purged entries that are currently valid. Only relevant if keepPurgedEntries is true.
toString() → String
A string representation of this object.
override
update(K key, V update(V value), {V ifAbsent()?}) → V
Updates the value for the provided key.
override
updateAll(V update(K key, V value)) → void
Updates all values.
override
walkTree<R>(R walker(K node), {K? root}) → R?
Walks tree from root and stops when walker returns some R object.

Operators

operator ==(Object other) → bool
The equality operator.
inherited
operator [](Object? key) → V?
The value for the given key, or null if key is not in the map.
override
operator []=(K key, V value) → void
Associates the key with the given value.
override