add some default types to de-duplicate similar implmentations

Pilz.Net/Data/DataManager.cs

@@ -0,0 +1,149 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace Pilz.Net.Data;
+
+public abstract class DataManager : IDataManager
+{
+    protected abstract void UpdateEntity<T>(T obj) where T : IDataObject;
+    protected abstract IQueryable<T> GetEntitySet<T>() where T : IDataObject;
+    protected abstract T? FindEntity<T>(int id) where T : IDataObject;
+    protected abstract void RemoveEntity<T>(T obj) where T : IDataObject;
+    protected abstract void SaveChanges();
+
+    public virtual IQueryable<T> Get<T>() where T : IDataObject
+    {
+        return GetEntitySet<T>();
+    }
+
+    public virtual T FindOrNew<T>(int? id) where T : IDataObject
+    {
+        if (Find<T>(id) is not T obj)
+            obj = Activator.CreateInstance<T>();
+        return obj;
+    }
+
+    public virtual T FindOrNew<T>(int id) where T : IDataObject
+    {
+        if (Find<T>(id) is not T obj)
+            obj = Activator.CreateInstance<T>();
+        return obj;
+    }
+
+    public virtual T? FindOrNull<T>(int? id) where T : IDataObject
+    {
+        if (id == null || id == 0)
+            return default;
+        return Find<T>(id);
+    }
+
+    public virtual T? FindOrNull<T>(int id) where T : IDataObject
+    {
+        if (id == 0)
+            return default;
+        return Find<T>(id);
+    }
+
+    public virtual T? Find<T>(int? id) where T : IDataObject
+    {
+        if (id == null)
+            return default;
+        return Find<T>(id.Value);
+    }
+
+    public virtual T? Find<T>(int id) where T : IDataObject
+    {
+        return FindEntity<T>(id);
+    }
+
+    public virtual bool FindOrNew<T>(int? id, [NotNullWhen(true)] out T? obj) where T : IDataObject
+    {
+        if (id == null || id == 0)
+        {
+            obj = Activator.CreateInstance<T>();
+            return obj != null;
+        }
+        return Find(id.Value, out obj);
+    }
+
+    public virtual bool FindOrNew<T>(int id, [NotNullWhen(true)] out T? obj) where T : IDataObject
+    {
+        if (id == 0)
+        {
+            obj = Activator.CreateInstance<T>();
+            return obj != null;
+        }
+        return Find(id, out obj);
+    }
+
+    public virtual bool FindOrNull<T>(int? id, out T? obj) where T : IDataObject
+    {
+        if (id == null || id == 0)
+        {
+            obj = default;
+            return true;
+        }
+        return Find(id.Value, out obj);
+    }
+
+    public virtual bool FindOrNull<T>(int id, out T? obj) where T : IDataObject
+    {
+        if (id == 0)
+        {
+            obj = default;
+            return true;
+        }
+        return Find(id, out obj);
+    }
+
+    public virtual bool Find<T>(int id, [NotNullWhen(true)] out T? obj) where T : IDataObject
+    {
+        if (FindEntity<T>(id) is not T t)
+        {
+            obj = default;
+            return false;
+        }
+        obj = t;
+        return true;
+    }
+
+    public virtual void Delete<T>(int id) where T : IDataObject
+    {
+        Delete<T>(id, false);
+    }
+
+    public virtual void Delete<T>(int id, bool save) where T : IDataObject
+    {
+        if (Find(id, out T? obj))
+            Delete(obj, save);
+    }
+
+    public virtual void Delete<T>(T? obj) where T : IDataObject
+    {
+        Delete(obj, false);
+    }
+
+    public virtual void Delete<T>(T? obj, bool save) where T : IDataObject
+    {
+        if (obj != null)
+        {
+            RemoveEntity(obj);
+            if (save) Save();
+        }
+    }
+
+    public virtual void Save<T>(T obj) where T : IDataObject
+    {
+        Save(obj, false);
+    }
+
+    public virtual void Save<T>(T obj, bool save) where T : IDataObject
+    {
+        UpdateEntity(obj);
+        if (save) Save();
+    }
+
+    public virtual void Save()
+    {
+        SaveChanges();
+    }
+}

Pilz.Net/Data/DataManagerEventArgs.cs

@@ -0,0 +1,8 @@
+namespace Pilz.Net.Data;
+
+public class DataManagerEventArgs(IDataManager manager) : EventArgs
+{
+    public IDataManager Manager { get; } = manager;
+}
+
+public delegate void DataManagerEventHandler(object sender, DataManagerEventArgs e);

Pilz.Net/Data/IDataManager.cs

@@ -0,0 +1,26 @@
+using System.Diagnostics.CodeAnalysis;
+
+namespace Pilz.Net.Data;
+
+public interface IDataManager
+{
+    void Delete<T>(int id) where T : IDataObject;
+    void Delete<T>(int id, bool save) where T : IDataObject;
+    void Delete<T>(T? obj) where T : IDataObject;
+    void Delete<T>(T? obj, bool save) where T : IDataObject;
+    T? Find<T>(int id) where T : IDataObject;
+    bool Find<T>(int id, [NotNullWhen(true)] out T? obj) where T : IDataObject;
+    T? Find<T>(int? id) where T : IDataObject;
+    T FindOrNew<T>(int id) where T : IDataObject;
+    bool FindOrNew<T>(int id, [NotNullWhen(true)] out T? obj) where T : IDataObject;
+    T FindOrNew<T>(int? id) where T : IDataObject;
+    bool FindOrNew<T>(int? id, [NotNullWhen(true)] out T? obj) where T : IDataObject;
+    T? FindOrNull<T>(int id) where T : IDataObject;
+    bool FindOrNull<T>(int id, out T? obj) where T : IDataObject;
+    T? FindOrNull<T>(int? id) where T : IDataObject;
+    bool FindOrNull<T>(int? id, out T? obj) where T : IDataObject;
+    IQueryable<T> Get<T>() where T : IDataObject;
+    void Save();
+    void Save<T>(T obj) where T : IDataObject;
+    void Save<T>(T obj, bool save) where T : IDataObject;
+}

Pilz.Net/Data/IDataObject.cs

@@ -0,0 +1,6 @@
+namespace Pilz.Net.Data;
+
+public interface IDataObject
+{
+    public int Id { get; }
+}