add some default types to de-duplicate similar implmentations

Pilz.Net/Api/Server/BaseHandler.cs

@@ -0,0 +1,63 @@
+using Pilz.Extensions.Reflection;
+using Pilz.Net.Data;
+using Pilz.Net.Extensions;
+using System.Diagnostics;
+using System.Linq.Expressions;
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+namespace Pilz.Net.Api.Server;
+
+public abstract class BaseHandler<TEntity, TUpdateMsg>(IApiServer server)
+    : IApiHandlerInitializer
+    where TEntity : IDataObject
+    where TUpdateMsg : ApiMessage
+{
+    public abstract string Route { get; }
+    protected virtual bool RegisterGet => true;
+    protected virtual bool RegisterPut => true;
+    protected virtual bool RegisterDelete => true;
+
+    public virtual void Initialize(IApiServer server)
+    {
+        var t = GetType();
+        if (RegisterGet)
+            server.RegisterHandler(t.GetMethod(nameof(Get))!.CreateDelegate(this), new(Route + "/{id}", "GET"), Debugger.IsAttached);
+        if (RegisterPut)
+            server.RegisterHandler(t.GetMethod(nameof(Put))!.CreateDelegate(this), new(Route + "/{id}", "PUT"), Debugger.IsAttached);
+        if (RegisterDelete)
+            server.RegisterHandler(t.GetMethod(nameof(Delete))!.CreateDelegate(this), new(Route + "/{id}", "DELETE"), Debugger.IsAttached);
+    }
+
+    public virtual ApiResult Get(int id)
+    {
+        if (!server.Manager.Find(id, out TEntity? entity))
+            return ApiResult.NotFound();
+        return ToClient(entity).ToItemResult();
+    }
+
+    public virtual ApiResult Put(int id, TUpdateMsg msg)
+    {
+        if (!server.Manager.Find(id, out TEntity? entity))
+            return ApiResult.NotFound();
+        if (UpdateEntity(entity, msg) is ApiResult result)
+            return result;
+        server.Manager.Save(entity, true);
+        return ToClient(entity).ToItemResult();
+    }
+
+    public virtual ApiResult Delete(int id)
+    {
+        server.Manager.Delete<TEntity>(id, true);
+        return ApiResult.Ok();
+    }
+
+    protected virtual TEntity CreateNewEntity()
+    {
+        return Activator.CreateInstance<TEntity>();
+    }
+
+    protected abstract ApiResult? UpdateEntity(TEntity entity, TUpdateMsg msg);
+
+    protected abstract IDataObject ToClient(TEntity entity);
+}