97 lines
2.3 KiB
C#
97 lines
2.3 KiB
C#
using System.Text.Json;
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namespace zero.Persistence;
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public class IdGenerator
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{
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const string CHARS = "abcdefghijklmnopqrstuvwxyz0123456789";
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private static Random random = new();
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/// <summary>
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/// Create a new unique Id
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/// </summary>
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public static string Create(int length = -1)
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{
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if (length < 1)
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{
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length = 12;
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}
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return new string(Enumerable.Repeat(CHARS, length).Select(s => s[random.Next(s.Length)]).ToArray());
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//if (length > 0)
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//{
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//return Convert.ToBase64String(Guid.NewGuid().ToByteArray())
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// .Replace("/", String.Empty)
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// .Replace("+", String.Empty)
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// .Replace("-", String.Empty)
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// .ToLowerInvariant()
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// .Substring(0, length);
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//}
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//return Guid.NewGuid().ToString();
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}
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/// <summary>
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/// Creates a simple hash from a string
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/// </summary>
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public static string HashString(string value)
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{
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return GetStableHashCode(value).ToString().Replace("-", String.Empty);
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}
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/// <summary>
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/// Creates a simple hash from a string
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/// </summary>
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public static string HashObject(params object[] values)
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{
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return GetStableHashCode(JsonSerializer.Serialize(values)).ToString().Replace("-", String.Empty);
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}
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/// <summary>
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/// Autofill IDs on an object with [GenerateId] attributes
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/// </summary>
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public static T Autofill<T>(T model)
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{
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// find all Raven Ids
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List<ObjectTraverser.Result<GenerateIdAttribute>> ravenIds = ObjectTraverser.FindAttribute<GenerateIdAttribute>(model);
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// set unset Raven Ids
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foreach (ObjectTraverser.Result<GenerateIdAttribute> item in ravenIds)
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{
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string id = item.Property.GetValue(item.Parent, null) as string;
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if (id.IsNullOrWhiteSpace())
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{
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id = item.Item.Length.HasValue ? Create(item.Item.Length.Value) : Create();
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item.Property.SetValue(item.Parent, id);
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}
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}
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return model;
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}
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static int GetStableHashCode(string str)
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{
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unchecked
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{
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int hash1 = 5381;
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int hash2 = hash1;
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for (int i = 0; i < str.Length && str[i] != '\0'; i += 2)
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{
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hash1 = ((hash1 << 5) + hash1) ^ str[i];
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if (i == str.Length - 1 || str[i + 1] == '\0')
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break;
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hash2 = ((hash2 << 5) + hash2) ^ str[i + 1];
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}
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return hash1 + (hash2 * 1566083941);
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}
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}
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}
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