Created
April 2, 2020 01:52
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ObjectId struct
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| using System; | |
| using System.Runtime.InteropServices; | |
| namespace Std.BasicTypes | |
| { | |
| [Serializable] | |
| [StructLayout(LayoutKind.Sequential, Pack = 1)] | |
| public struct ObjectId : IEquatable<ObjectId> | |
| { | |
| public static readonly ObjectId Null; | |
| public long Number { get; } | |
| public int Version { get; } | |
| public ObjectId(ObjectId source) | |
| : this() | |
| { | |
| Number = source.Number; | |
| Version = source.Version; | |
| } | |
| public ObjectId(long number) | |
| : this() | |
| { | |
| Number = number; | |
| Version = 0; | |
| } | |
| public ObjectId(long number, int version) | |
| : this() | |
| { | |
| Number = number; | |
| Version = version; | |
| } | |
| public bool IsValid | |
| { | |
| get => Number > 0 && Version >= 0; | |
| } | |
| public bool Equals(ObjectId other) | |
| { | |
| return Number == other.Number && Version == other.Version; | |
| } | |
| public override int GetHashCode() | |
| { | |
| unchecked | |
| { | |
| return (Number.GetHashCode() * 397) ^ Version; | |
| } | |
| } | |
| public static bool operator==(ObjectId left, ObjectId right) | |
| { | |
| return left.Equals(right); | |
| } | |
| public static bool operator!=(ObjectId left, ObjectId right) | |
| { | |
| return !left.Equals(right); | |
| } | |
| public override bool Equals(object obj) | |
| { | |
| if (ReferenceEquals(null, obj)) | |
| { | |
| return false; | |
| } | |
| return obj is ObjectId id && Equals(id); | |
| } | |
| public ObjectId WithVersion(int newVersion) | |
| { | |
| return new ObjectId(Number, newVersion); | |
| } | |
| public override string ToString() | |
| { | |
| return Number + ":" + Version; | |
| } | |
| public static ObjectId Parse(string text) | |
| { | |
| var result = InternalParse(text, out var id); | |
| switch (result) | |
| { | |
| case ParseResult.Success: | |
| return id; | |
| case ParseResult.ArgNull: | |
| throw new ArgumentNullException(nameof(text)); | |
| case ParseResult.InvalidLength: | |
| throw new FormatException("Invalid length"); | |
| case ParseResult.InvalidFormat: | |
| throw new FormatException("Invalid format"); | |
| } | |
| throw new InvalidOperationException(); | |
| } | |
| public static bool TryParse(string text, out ObjectId id) | |
| { | |
| var result = InternalParse(text, out id); | |
| return result == ParseResult.Success; | |
| } | |
| private enum ParseResult | |
| { | |
| Success, | |
| ArgNull, | |
| InvalidLength, | |
| InvalidFormat | |
| } | |
| private static ParseResult InternalParse(string text, out ObjectId result) | |
| { | |
| result = Null; | |
| if (text == null) | |
| { | |
| return ParseResult.ArgNull; | |
| } | |
| if (text.Length == 0) | |
| { | |
| return ParseResult.InvalidLength; | |
| } | |
| var parts = text.Split(':'); | |
| if (parts.Length > 2) | |
| { | |
| return ParseResult.InvalidFormat; | |
| } | |
| long id = 0; | |
| var version = 0; | |
| if (!long.TryParse(parts[0], out id)) | |
| { | |
| return ParseResult.InvalidFormat; | |
| } | |
| if (parts.Length == 2 && | |
| !int.TryParse(parts[1], out version)) | |
| { | |
| return ParseResult.InvalidFormat; | |
| } | |
| result = new ObjectId(id, version); | |
| return ParseResult.Success; | |
| } | |
| } | |
| public static class ObjectIdExtensions | |
| { | |
| public static bool IsValid(this ObjectId? id) | |
| { | |
| var result = id.HasValue && id.Value.IsValid; | |
| return result; | |
| } | |
| } | |
| } |
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