TF-1194: create new default identity: add function getSmallestIdentities and sortListIdentities

2023-01-16 16:55:01 +07:00
parent cfea102f09
commit 9147eed30c
2 changed files with 178 additions and 0 deletions
@@ -0,0 +1,46 @@
+import 'package:jmap_dart_client/jmap/core/unsigned_int.dart';
+import 'package:jmap_dart_client/jmap/identities/identity.dart';
+
+class IdentityUtils {
+  
+  List<Identity>? getSmallestOrderedIdentity(List<Identity>? identities) {
+    if (identities == null || identities.isEmpty) {
+      return identities;
+    }
+    final initialIdentity = Identity(sortOrder: UnsignedInt(9007199254740991));
+    final smallestIdentity = identities.fold<Identity>(
+      initialIdentity,
+      (previousIdentity, nextIdentity) {
+        if (previousIdentity.sortOrder == null && nextIdentity.sortOrder == null) {
+          return initialIdentity;
+        } else if (previousIdentity.sortOrder == null) {
+          return nextIdentity;
+        } else if (nextIdentity.sortOrder == null) {
+          return previousIdentity;
+        } 
+              
+        return previousIdentity.sortOrder!.value < nextIdentity.sortOrder!.value 
+            ? previousIdentity : nextIdentity;
+      });
+
+    if (smallestIdentity == initialIdentity) {
+      return identities;
+    }
+    
+    return identities.where((element) => element.sortOrder == smallestIdentity.sortOrder).toList();
+  }
+
+  void sortListIdentities(List<Identity> identities) {
+    identities.sort((identity1, identity2) {
+      var sortOrder1 = identity1.sortOrder;
+      var sortOrder2 = identity2.sortOrder;
+      if (identity1.sortOrder == null) {
+        sortOrder1 = UnsignedInt(2147483647); // 2^31 - 1
+      }
+      if (identity2.sortOrder == null) {
+        sortOrder2 = UnsignedInt(2147483647);
+      }
+      return sortOrder1!.value < sortOrder2!.value ? -1 : 1 ;
+    });
+  }
+}