Initial Commit ...

2024-01-25 04:41:17 +03:30
commit ff4d0d5dcb
51 changed files with 5949 additions and 0 deletions
@@ -0,0 +1,61 @@
+using System;
+using xDataService.Interfaces;
+
+namespace xDataService.Helpers {
+    /// <summary>
+    /// this service provide Sequential GUID mechanism for Entity Ids ...
+    /// </summary>
+    public class XSequentialGuid : IXSequentialGuid {
+        private static int[] sqlOrderMap = null;
+        private static int[] SQLORDERMAP {
+            get {
+                if (sqlOrderMap == null) {
+                    sqlOrderMap = new int[16] {
+                    3,
+                    2,
+                    1,
+                    0,
+                    5,
+                    4,
+                    7,
+                    6,
+                    9,
+                    8,
+                    15,
+                    14,
+                    13,
+                    12,
+                    11,
+                    10
+                    };
+                    // 3 - the least significant byte in Guid ByteArray [for SQL Server ORDER BY clause]
+                    // 10 - the most significant byte in Guid ByteArray [for SQL Server ORDERY BY clause]
+                }
+                return sqlOrderMap;
+            }
+        }
+
+        private Guid currentGuid;
+
+        public XSequentialGuid () {
+            currentGuid = Guid.NewGuid ();
+        }
+
+        public Guid GetCurrentGuid () {
+            return currentGuid;
+        }
+
+        public Guid Next () {
+            byte[] bytes = currentGuid.ToByteArray ();
+            for (int mapIndex = 0; mapIndex < 16; mapIndex++) {
+                int bytesIndex = SQLORDERMAP[mapIndex];
+                bytes[bytesIndex]++;
+                if (bytes[bytesIndex] != 0) {
+                    break; // No need to increment more significant bytes
+                }
+            }
+            currentGuid = new Guid (bytes);
+            return currentGuid;
+        }
+    }
+}