Display Forez presence

lib/lists/base_set.dart

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+import 'dart:collection';
+
+/// Base set
+///
+/// @author pierre Hubert
+
+class BaseSet<T> extends SetBase<T> {
+  final _set = new Set<T>();
+
+  @override
+  bool add(T value) => _set.add(value);
+
+  @override
+  bool contains(Object element) => _set.contains(element);
+
+  @override
+  Iterator<T> get iterator => _set.iterator;
+
+  @override
+  int get length => _set.length;
+
+  @override
+  T lookup(Object element) => _set.lookup(element);
+
+  @override
+  bool remove(Object value) => _set.remove(value);
+
+  @override
+  Set<T> toSet() => _set.toSet();
+}

lib/lists/forez_presences_set.dart

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+import 'package:comunic/lists/base_set.dart';
+import 'package:comunic/models/forez_presence.dart';
+
+/// Forez presence set
+///
+/// @author Pierre Hubert
+
+class PresenceSet extends BaseSet<Presence> {
+  /// Get the presence of a specific user
+  PresenceSet getForUser(int userID) =>
+      PresenceSet()..addAll(where((element) => element.userID == userID));
+
+  bool containsDate(DateTime dt) => any(
+        (element) =>
+            element.year == dt.year &&
+            element.month == dt.month &&
+            element.day == dt.day,
+      );
+
+  void removeDate(DateTime dt) => removeWhere(
+        (element) =>
+            element.year == dt.year &&
+            element.month == dt.month &&
+            element.day == dt.day,
+      );
+
+  void toggleDate(DateTime dt, int userID) {
+    if (containsDate(dt))
+      removeDate(dt);
+    else
+      add(Presence.fromDateTime(dt, userID));
+  }
+
+  int countAtDate(DateTime dt) => where(
+        (element) =>
+            element.year == dt.year &&
+            element.month == dt.month &&
+            element.day == dt.day,
+      ).length;
+
+  /// Get the list of users present at a specified date
+  List<int> getUsersAtDate(DateTime dt) => where(
+        (element) =>
+            element.year == dt.year &&
+            element.month == dt.month &&
+            element.day == dt.day,
+      ).map((e) => e.userID).toList();
+
+  /// Get the ID of all the users referenced in this set
+  Set<int> get usersID => map((element) => element.userID).toSet();
+}