blob: d4b166811985fa200b3c3bffe2ef5b4f1df90684 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
part of observe;
/**
* Converts the [Iterable] or [Map] to an [ObservableList] or [ObservableMap],
* respectively. This is a convenience function to make it easier to convert
* literals into the corresponding observable collection type.
*
* If [value] is not one of those collection types, or is already [Observable],
* it will be returned unmodified.
*
* If [value] is a [Map], the resulting value will use the appropriate kind of
* backing map: either [HashMap], [LinkedHashMap], or [SplayTreeMap].
*
* By default this performs a deep conversion, but you can set [deep] to false
* for a shallow conversion. This does not handle circular data structures.
* If a conversion is peformed, mutations are only observed to the result of
* this function. Changing the original collection will not affect it.
*/
// TODO(jmesserly): ObservableSet?
toObservable(value, {bool deep: true}) =>
deep ? _toObservableDeep(value) : _toObservableShallow(value);
_toObservableShallow(value) {
if (value is Observable) return value;
if (value is Map) return new ObservableMap.from(value);
if (value is Iterable) return new ObservableList.from(value);
return value;
}
_toObservableDeep(value) {
if (value is Observable) return value;
if (value is Map) {
var result = new ObservableMap._createFromType(value);
value.forEach((k, v) {
result[_toObservableDeep(k)] = _toObservableDeep(v);
});
return result;
}
if (value is Iterable) {
return new ObservableList.from(value.map(_toObservableDeep));
}
return value;
}