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//------------------------------------------------------------------------------
// <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;
}
}
}
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