Initial Commit ...

2024-01-25 04:41:17 +03:30
commit ff4d0d5dcb
51 changed files with 5949 additions and 0 deletions
@@ -0,0 +1,79 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using xCommons.Extensions;
+
+namespace xDataService.Helpers {
+    public partial class XCursorHelper {
+        public static string ToCursor<T> (T id) {
+            //
+            // Check Numbers ...
+            if (id.ToString ().IsDigits ()) {
+                return Convert
+                    .ToBase64String (BitConverter
+                        .GetBytes (Convert.ToInt32 (id))
+                    );
+            } else
+                //
+                // Check Guid ...
+                if (id.ToString ().IsGuid ()) {
+                    return Convert
+                        .ToBase64String (new Guid (id.ToString ())
+                            .ToByteArray ());
+                } else
+            //
+            // Assume as String ...
+            {
+                return Convert
+                    .ToBase64String (id
+                        .ToString ().ToBytes ());
+            }
+        }
+
+        public static T FromCursor<T> (string cursor) {
+            //
+            // Check Numbers ...
+            var returnType = typeof (T);
+            if (returnType == typeof (int) ||
+                returnType == typeof (long) ||
+                returnType == typeof (decimal)) {
+                return Convert.ChangeType ((BitConverter
+                        .ToInt32 (Convert
+                            .FromBase64String (cursor),
+                            0
+                        ))
+                    .ToDynamicObject (), returnType);
+            } else
+                //
+                // Check Guid ...
+                if (returnType == typeof (Guid)) {
+                    return Convert.ChangeType ((new Guid (
+                            Convert.FromBase64String (cursor)
+                        ))
+                        .ToDynamicObject (), returnType);
+                } else
+            //
+            // Assume as String ...
+            {
+                return Convert.ChangeType ((
+                        Convert.FromBase64String (cursor)
+                    )
+                    .ToDynamicObject (), returnType);
+            }
+        }
+
+        public static (string firstCursor, string lastCursor) GetFirstAndLastCursor<T> (IEnumerable<T> ids) {
+            //
+            if (ids?.Any () != true) {
+                return (null, null);
+            }
+
+            //
+            var firstCursor = ToCursor (ids.First ());
+            var lastCursor = ToCursor (ids.Last ());
+
+            //
+            return (firstCursor, lastCursor);
+        }
+    }
+}