Move TypeHelper to Core.Tools

SabreTools.Core/Tools/TypeHelper.cs

@@ -0,0 +1,82 @@
+using System;
+using System.Linq;
+using System.Reflection;
+using System.Xml.Serialization;
+using SabreTools.Models;
+using SabreTools.Models.Metadata;
+
+namespace SabreTools.Core.Tools
+{
+    public static class TypeHelper
+    {
+        /// <summary>
+        /// Get constant values for the given type, if possible
+        /// </summary>
+        public static string[]? GetConstants(Type? type)
+        {
+            if (type == null)
+                return null;
+
+            var fields = type.GetFields(BindingFlags.Static | BindingFlags.Public | BindingFlags.FlattenHierarchy);
+            if (fields == null)
+                return null;
+
+#if NET20 || NET35 || NET40
+            return fields
+                .Where(f => f.IsLiteral && !f.IsInitOnly)
+                .Where(f => Attribute.GetCustomAttributes(f, typeof(NoFilterAttribute)).Length == 0)
+                .Select(f => f.GetRawConstantValue() as string)
+                .Where(v => v != null)
+                .ToArray()!;
+#else
+            return fields
+                .Where(f => f.IsLiteral && !f.IsInitOnly)
+                .Where(f => !f.CustomAttributes.Any(a => a.AttributeType == typeof(NoFilterAttribute)))
+                .Select(f => f.GetRawConstantValue() as string)
+                .Where(v => v != null)
+                .ToArray()!;
+#endif
+        }
+
+        /// <summary>
+        /// Attempt to get all DatItem types
+        /// </summary>
+        public static string?[] GetDatItemTypeNames()
+        {
+            return AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(a => a.GetTypes())
+                .Where(t => typeof(DatItem).IsAssignableFrom(t) && t.IsClass)
+                .Select(GetXmlRootAttributeElementName)
+                .ToArray();
+        }
+
+        /// <summary>
+        /// Attempt to get the DatItem type from the name
+        /// </summary>
+        public static Type? GetDatItemType(string? itemType)
+        {
+            if (string.IsNullOrEmpty(itemType))
+                return null;
+
+            return AppDomain.CurrentDomain.GetAssemblies()
+                .SelectMany(a => a.GetTypes())
+                .Where(t => typeof(DatItem).IsAssignableFrom(t) && t.IsClass)
+                .FirstOrDefault(t => string.Equals(GetXmlRootAttributeElementName(t), itemType, StringComparison.OrdinalIgnoreCase));
+        }
+
+        /// <summary>
+        /// Attempt to get the XmlRootAttribute.ElementName value from a type
+        /// </summary>
+        public static string? GetXmlRootAttributeElementName(Type? type)
+        {
+            if (type == null)
+                return null;
+
+#if NET20 || NET35 || NET40
+            return (Attribute.GetCustomAttribute(type, typeof(XmlRootAttribute)) as XmlRootAttribute)!.ElementName;
+#else
+            return type.GetCustomAttribute<XmlRootAttribute>()?.ElementName;
+#endif
+        }
+    }
+}