blob: c9e4aa68f2fa4f095f9132df9741dd213e667507 [file] [log] [blame]
// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import 'dart:async';
import 'package:flutter/foundation.dart';
import 'package:plugin_platform_interface/plugin_platform_interface.dart';
import 'method_channel_shared_preferences.dart';
/// The interface that implementations of shared_preferences must implement.
///
/// Platform implementations should extend this class rather than implement it as `shared_preferences`
/// does not consider newly added methods to be breaking changes. Extending this class
/// (using `extends`) ensures that the subclass will get the default implementation, while
/// platform implementations that `implements` this interface will be broken by newly added
/// [SharedPreferencesStorePlatform] methods.
abstract class SharedPreferencesStorePlatform extends PlatformInterface {
/// Constructs a SharedPreferencesStorePlatform.
SharedPreferencesStorePlatform() : super(token: _token);
static final Object _token = Object();
/// The default instance of [SharedPreferencesStorePlatform] to use.
///
/// Defaults to [MethodChannelSharedPreferencesStore].
static SharedPreferencesStorePlatform get instance => _instance;
/// Platform-specific plugins should set this with their own platform-specific
/// class that extends [SharedPreferencesStorePlatform] when they register themselves.
static set instance(SharedPreferencesStorePlatform instance) {
if (!instance.isMock) {
PlatformInterface.verify(instance, _token);
}
_instance = instance;
}
static SharedPreferencesStorePlatform _instance =
MethodChannelSharedPreferencesStore();
/// Only mock implementations should set this to true.
///
/// Mockito mocks are implementing this class with `implements` which is forbidden for anything
/// other than mocks (see class docs). This property provides a backdoor for mockito mocks to
/// skip the verification that the class isn't implemented with `implements`.
@visibleForTesting
@Deprecated('Use MockPlatformInterfaceMixin instead')
bool get isMock => false;
/// Removes the value associated with the [key].
Future<bool> remove(String key);
/// Stores the [value] associated with the [key].
///
/// The [valueType] must match the type of [value] as follows:
///
/// * Value type "Bool" must be passed if the value is of type `bool`.
/// * Value type "Double" must be passed if the value is of type `double`.
/// * Value type "Int" must be passed if the value is of type `int`.
/// * Value type "String" must be passed if the value is of type `String`.
/// * Value type "StringList" must be passed if the value is of type `List<String>`.
Future<bool> setValue(String valueType, String key, Object value);
/// Removes all keys and values in the store where the key starts with 'flutter.'.
///
/// This default behavior is for backwards compatibility with older versions of this
/// plugin, which did not support custom prefixes, and instead always used the
/// prefix 'flutter.'.
Future<bool> clear();
/// Removes all keys and values in the store with given prefix.
Future<bool> clearWithPrefix(String prefix) {
throw UnimplementedError('clearWithPrefix is not implemented.');
}
/// Returns all key/value pairs persisted in this store where the key starts with 'flutter.'.
///
/// This default behavior is for backwards compatibility with older versions of this
/// plugin, which did not support custom prefixes, and instead always used the
/// prefix 'flutter.'.
Future<Map<String, Object>> getAll();
/// Returns all key/value pairs persisting in this store that have given [prefix].
Future<Map<String, Object>> getAllWithPrefix(String prefix) {
throw UnimplementedError('getAllWithPrefix is not implemented.');
}
}
/// Stores data in memory.
///
/// Data does not persist across application restarts. This is useful in unit-tests.
class InMemorySharedPreferencesStore extends SharedPreferencesStorePlatform {
/// Instantiates an empty in-memory preferences store.
InMemorySharedPreferencesStore.empty() : _data = <String, Object>{};
/// Instantiates an in-memory preferences store containing a copy of [data].
InMemorySharedPreferencesStore.withData(Map<String, Object> data)
: _data = Map<String, Object>.from(data);
final Map<String, Object> _data;
static const String _defaultPrefix = 'flutter.';
@override
Future<bool> clear() async {
return clearWithPrefix(_defaultPrefix);
}
@override
Future<bool> clearWithPrefix(String prefix) async {
_data.removeWhere((String key, _) => key.startsWith(prefix));
return true;
}
@override
Future<Map<String, Object>> getAll() async {
return getAllWithPrefix(_defaultPrefix);
}
@override
Future<Map<String, Object>> getAllWithPrefix(String prefix) async {
final Map<String, Object> preferences = Map<String, Object>.from(_data);
preferences.removeWhere((String key, _) => !key.startsWith(prefix));
return preferences;
}
@override
Future<bool> remove(String key) async {
_data.remove(key);
return true;
}
@override
Future<bool> setValue(String valueType, String key, Object value) async {
_data[key] = value;
return true;
}
}