Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Configuration/RuleInfoComparer.cs

@@ -0,0 +1,69 @@
+//------------------------------------------------------------------------------
+// <copyright file="RuleInfoComparer.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.Configuration
+{
+    using System;
+    using System.Xml;
+    using System.Configuration;
+    using System.Collections.Specialized;
+    using System.Collections;
+    using System.Globalization;
+    using System.IO;
+    using System.Text;
+    using System.ComponentModel;
+    using System.Web.Hosting;
+    using System.Web.Util;
+    using System.Web.Configuration;
+    using System.Web.Management;
+    using System.Web.Compilation;
+
+    //
+    // This class is used to compare two RuleInfo object.  Basically, the array list
+    // will be sorted based on class hierachical order.  The smaller the value, the
+    // more nearer the class is to the root (WebBaseEvent), in a class inheritance sense.
+    // 
+    // On the other hand, if x > y, it means x is NOT a parent class of y.
+    //
+    // The array is sorted in this way so that if we want to find out the config setting of
+    // an event class x, we start searching in a decreasing order, and the first entry (E)
+    // that satifies the test: if (x is E), then we find the right settings for x.
+    //
+    // BTW, this is just a trick to save me from writing too much code.  A n-node tree
+    // method is faster, but I was too lazy.
+    //
+    internal class RuleInfoComparer : IComparer{
+        public int Compare(object x, object y) {
+            int res;
+            
+            Type xType = 
+                ((HealthMonitoringSectionHelper.RuleInfo)x)._eventMappingSettings.RealType;
+            Type yType = 
+                ((HealthMonitoringSectionHelper.RuleInfo)y)._eventMappingSettings.RealType;
+    
+            if (xType.Equals(yType)) {
+                res = 0;
+            } 
+            else if (xType.IsSubclassOf(yType)) {
+                res = 1;
+            } 
+            else if (yType.IsSubclassOf(xType)) {
+                res = -1;
+            }
+            else {
+                // If they're unrelated, we can't return 0 because it
+                // will confuse the sorting method.
+                // We can return 1 or -1, but it must be consistent.
+                return String.Compare(xType.ToString(), yType.ToString(), StringComparison.Ordinal);
+            }
+    
+            Debug.Trace("RuleInfoComparer", "xType=" + xType.ToString() +
+                "; yType=" + yType.ToString() + "; res=" + res);
+            
+            return res;
+        }
+    }
+}