baseline: OpenMU upstream b5a0961 (fresh source)

src/Persistence/ObjectExtensions.cs

@@ -0,0 +1,79 @@
+// <copyright file="ObjectExtensions.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.Persistence;
+
+using System.Collections.Concurrent;
+using System.Reflection;
+using MUnique.OpenMU.Interfaces;
+
+/// <summary>
+/// Extensions for objects.
+/// </summary>
+public static class ObjectExtensions
+{
+    private static readonly ConcurrentDictionary<Type, PropertyInfo?> IdProperties = new();
+    private static readonly ConcurrentDictionary<Type, PropertyInfo?> NameProperties = new();
+
+    /// <summary>
+    /// Gets the guid identifier of an object, which has the name "Id".
+    /// </summary>
+    /// <param name="item">The item.</param>
+    /// <returns>The guid identifier of an object, which has the name "Id".</returns>
+    public static Guid GetId(this object item)
+    {
+        if (item is IIdentifiable identifiable)
+        {
+            return identifiable.Id;
+        }
+
+        if (!IdProperties.TryGetValue(item.GetType(), out var idProperty))
+        {
+            idProperty = item.GetType().GetProperties().FirstOrDefault(p => p.Name.Equals("Id") && p.PropertyType == typeof(Guid));
+            IdProperties.TryAdd(item.GetType(), idProperty);
+        }
+
+        if (idProperty is null)
+        {
+            return Guid.Empty;
+        }
+
+        return (Guid)idProperty.GetValue(item)!;
+    }
+
+    /// <summary>
+    /// Gets the name of an object.
+    /// </summary>
+    /// <param name="item">The item.</param>
+    /// <returns>The name of an object.</returns>
+    public static string GetName(this object item)
+    {
+        if (!NameProperties.TryGetValue(item.GetType(), out var nameProperty))
+        {
+            var properties = item.GetType().GetProperties()
+                .Where(p => p.PropertyType == typeof(string) || p.PropertyType == typeof(LocalizedString))
+                .ToList();
+            nameProperty = properties.FirstOrDefault(p => p.Name.Equals("Name"))
+                           ?? properties.FirstOrDefault(p => p.Name.Equals("Caption"))
+                           ?? properties.FirstOrDefault(p => p.Name.Equals("Designation"))
+                           ?? properties.FirstOrDefault(p => p.Name.Equals("Description"));
+            NameProperties.TryAdd(item.GetType(), nameProperty);
+        }
+
+        if (nameProperty is null)
+        {
+            return item.ToString() ?? string.Empty;
+        }
+
+        var result = nameProperty.GetValue(item) switch
+        {
+            LocalizedString localizedString => localizedString.ToString(),
+            string str => str!,
+            null => string.Empty,
+            _ => item.ToString(),
+        };
+
+        return result ?? string.Empty;
+    }
+}