77 lines
1.8 KiB
C#
77 lines
1.8 KiB
C#
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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.IO;
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using System.Linq;
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using System.Text;
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namespace Umbraco.Core
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{
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/// <summary>
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/// Used to create a hash code from multiple objects.
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/// </summary>
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/// <remarks>
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/// .Net has a class the same as this: System.Web.Util.HashCodeCombiner and of course it works for all sorts of things
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/// and is probably more stable in general, however we just need a quick easy class for this in order to create a unique
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/// hash of plugins to see if they've changed.
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/// </remarks>
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internal class HashCodeCombiner
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{
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private int _combinedHash;
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internal void AddInt(int i)
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{
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_combinedHash = ((_combinedHash << 5) + _combinedHash) ^ i;
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}
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internal void AddObject(object o)
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{
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AddInt(o.GetHashCode());
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}
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internal void AddDateTime(DateTime d)
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{
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AddInt(d.GetHashCode());
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}
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internal void AddCaseInsensitiveString(string s)
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{
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if (s != null)
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AddInt((StringComparer.InvariantCultureIgnoreCase).GetHashCode(s));
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}
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internal void AddFile(FileInfo f)
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{
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AddCaseInsensitiveString(f.FullName);
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AddDateTime(f.CreationTimeUtc);
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AddDateTime(f.LastWriteTimeUtc);
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AddInt(f.Length.GetHashCode());
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}
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internal void AddFolder(DirectoryInfo d)
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{
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AddCaseInsensitiveString(d.FullName);
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AddDateTime(d.CreationTimeUtc);
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AddDateTime(d.LastWriteTimeUtc);
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foreach (var f in d.GetFiles())
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{
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AddFile(f);
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}
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foreach (var s in d.GetDirectories())
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{
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AddFolder(s);
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}
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}
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/// <summary>
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/// Returns the hex code of the combined hash code
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/// </summary>
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/// <returns></returns>
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internal string GetCombinedHashCode()
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{
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return _combinedHash.ToString("x", CultureInfo.InvariantCulture);
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}
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}
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}
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