new change to use intaleq_map sdk 04-16-4

packages/get_storage/test/utils/list_equality.dart

@@ -0,0 +1,71 @@
+const int _HASH_MASK = 0x7fffffff;
+
+class ListEquality<E> implements Equality<List<E>> {
+  final Equality<E> _elementEquality;
+  const ListEquality([Equality<E> elementEquality = const DefaultEquality()])
+      : _elementEquality = elementEquality;
+
+  @override
+  bool equals(List<E> list1, List<E> list2) {
+    if (identical(list1, list2)) return true;
+
+    var length = list1.length;
+    if (length != list2.length) return false;
+    for (var i = 0; i < length; i++) {
+      if (!_elementEquality.equals(list1[i], list2[i])) return false;
+    }
+    return true;
+  }
+
+  @override
+  int hash(List<E> list) {
+    // Jenkins's one-at-a-time hash function.
+    // This code is almost identical to the one in IterableEquality, except
+    // that it uses indexing instead of iterating to get the elements.
+    var hash = 0;
+    for (var i = 0; i < list.length; i++) {
+      var c = _elementEquality.hash(list[i]);
+      hash = (hash + c) & _HASH_MASK;
+      hash = (hash + (hash << 10)) & _HASH_MASK;
+      hash ^= (hash >> 6);
+    }
+    hash = (hash + (hash << 3)) & _HASH_MASK;
+    hash ^= (hash >> 11);
+    hash = (hash + (hash << 15)) & _HASH_MASK;
+    return hash;
+  }
+
+  @override
+  bool isValidKey(Object o) => o is List<E>;
+}
+
+abstract class Equality<E> {
+  const factory Equality() = DefaultEquality<E>;
+
+  /// Compare two elements for being equal.
+  ///
+  /// This should be a proper equality relation.
+  bool equals(E e1, E e2);
+
+  /// Get a hashcode of an element.
+  ///
+  /// The hashcode should be compatible with [equals], so that if
+  /// `equals(a, b)` then `hash(a) == hash(b)`.
+  int hash(E e);
+
+  /// Test whether an object is a valid argument to [equals] and [hash].
+  ///
+  /// Some implementations may be restricted to only work on specific types
+  /// of objects.
+  bool isValidKey(Object o);
+}
+
+class DefaultEquality<E> implements Equality<E> {
+  const DefaultEquality();
+  @override
+  bool equals(Object? e1, Object? e2) => e1 == e2;
+  @override
+  int hash(Object? e) => e.hashCode;
+  @override
+  bool isValidKey(Object o) => true;
+}