102 lines
3.0 KiB
C#
102 lines
3.0 KiB
C#
using System;
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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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namespace Umbraco.Core
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{
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/// <summary>
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/// Used to create a .NET HashCode 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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/// which we've not included here as we just need a quick easy class for this in order to create a unique
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/// hash of directories/files to see if they have changed.
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///
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/// NOTE: It's probably best to not relying on the hashing result across AppDomains! If you need a constant/reliable hash value
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/// between AppDomains use SHA1. This is perfect for hashing things in a very fast way for a single AppDomain.
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/// </remarks>
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internal class HashCodeCombiner
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{
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private long _combinedHash = 5381L;
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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 AddString(string s)
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{
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if (s != null)
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AddInt((StringComparer.InvariantCulture).GetHashCode(s));
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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 AddFileSystemItem(FileSystemInfo f)
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{
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//if it doesn't exist, don't proceed.
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if (!f.Exists)
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return;
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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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//check if it is a file or folder
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var fileInfo = f as FileInfo;
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if (fileInfo != null)
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{
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AddInt(fileInfo.Length.GetHashCode());
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}
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var dirInfo = f as DirectoryInfo;
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if (dirInfo != null)
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{
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foreach (var d in dirInfo.GetFiles())
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{
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AddFile(d);
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}
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foreach (var s in dirInfo.GetDirectories())
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{
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AddFolder(s);
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}
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}
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}
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internal void AddFile(FileInfo f)
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{
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AddFileSystemItem(f);
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}
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internal void AddFolder(DirectoryInfo d)
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{
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AddFileSystemItem(d);
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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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