blob: 953746daa745eb8d777ed8a88f2f32765d0cf81f [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 'package:flutter/foundation.dart' show immutable, objectRuntimeType;
/// Uniquely identifies object an among [GoogleMap] collections of a specific
/// type.
///
/// This does not have to be globally unique, only unique among the collection.
@immutable
class MapsObjectId<T> {
/// Creates an immutable object representing a [T] among [GoogleMap] Ts.
///
/// An [AssertionError] will be thrown if [value] is null.
const MapsObjectId(this.value) : assert(value != null);
/// The value of the id.
final String value;
@override
bool operator ==(Object other) {
if (identical(this, other)) {
return true;
}
if (other.runtimeType != runtimeType) {
return false;
}
return other is MapsObjectId<T> && value == other.value;
}
@override
int get hashCode => value.hashCode;
@override
String toString() {
return '${objectRuntimeType(this, 'MapsObjectId')}($value)';
}
}
/// A common interface for maps types.
abstract class MapsObject<T> {
/// A identifier for this object.
MapsObjectId<T> get mapsId;
/// Returns a duplicate of this object.
T clone();
/// Converts this object to something serializable in JSON.
Object toJson();
}