Imported Upstream version 6.6.0.89

Former-commit-id: b39a328747c2f3414dc52e009fb6f0aa80ca2492

external/api-doc-tools/mdoc/Mono.Documentation/Updater/Statistics/StatisticsStorage.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace Mono.Documentation.Updater.Statistics
+{
+    /// <summary>
+    /// The class stores statistics: int value for each StatisticsItem-StatisticsMetrics pair
+    /// </summary>
+    public class StatisticsStorage
+    {
+        public Dictionary<StatisticsItem, Dictionary<StatisticsMetrics, int>> Values { get; } = new Dictionary<StatisticsItem, Dictionary<StatisticsMetrics, int>>();
+
+        public StatisticsStorage()
+        {
+            foreach (var statisticsItem in Enum.GetValues(typeof(StatisticsItem)))
+            {
+                var metrics = Values[(StatisticsItem)statisticsItem] = new Dictionary<StatisticsMetrics, int>();
+                foreach (var statisticsMetrics in Enum.GetValues(typeof(StatisticsMetrics)))
+                {
+                    metrics[(StatisticsMetrics) statisticsMetrics] = 0;
+                }
+            }
+        }
+
+        public void AddMetric(StatisticsItem item, StatisticsMetrics metrics, int delta = 1)
+        {
+            Values[item][metrics] += delta;
+        }
+    }
+}