66 lines
2.6 KiB
C#
66 lines
2.6 KiB
C#
namespace System.Web.Mvc {
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading;
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internal static class DescriptorUtil {
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private static void AppendPartToUniqueIdBuilder(StringBuilder builder, object part) {
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if (part == null) {
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builder.Append("[-1]");
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}
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else {
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string partString = Convert.ToString(part, CultureInfo.InvariantCulture);
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builder.AppendFormat("[{0}]{1}", partString.Length, partString);
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}
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}
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public static string CreateUniqueId(params object[] parts) {
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return CreateUniqueId((IEnumerable<object>)parts);
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}
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public static string CreateUniqueId(IEnumerable<object> parts) {
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// returns a unique string made up of the pieces passed in
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StringBuilder builder = new StringBuilder();
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foreach (object part in parts) {
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// We can special-case certain part types
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MemberInfo memberInfo = part as MemberInfo;
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if (memberInfo != null) {
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AppendPartToUniqueIdBuilder(builder, memberInfo.Module.ModuleVersionId);
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AppendPartToUniqueIdBuilder(builder, memberInfo.MetadataToken);
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continue;
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}
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IUniquelyIdentifiable uniquelyIdentifiable = part as IUniquelyIdentifiable;
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if (uniquelyIdentifiable != null) {
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AppendPartToUniqueIdBuilder(builder, uniquelyIdentifiable.UniqueId);
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continue;
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}
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AppendPartToUniqueIdBuilder(builder, part);
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}
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return builder.ToString();
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}
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public static TDescriptor[] LazilyFetchOrCreateDescriptors<TReflection, TDescriptor>(ref TDescriptor[] cacheLocation, Func<TReflection[]> initializer, Func<TReflection, TDescriptor> converter) {
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// did we already calculate this once?
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TDescriptor[] existingCache = Interlocked.CompareExchange(ref cacheLocation, null, null);
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if (existingCache != null) {
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return existingCache;
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}
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TReflection[] memberInfos = initializer();
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TDescriptor[] descriptors = memberInfos.Select(converter).Where(descriptor => descriptor != null).ToArray();
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TDescriptor[] updatedCache = Interlocked.CompareExchange(ref cacheLocation, descriptors, null);
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return updatedCache ?? descriptors;
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}
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}
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}
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