feat: 新增数据过滤器基类

Author: jianxuanbing

framework/src/Bing.Datas.EntityFramework/Bing.Datas.EntityFramework.csproj

@@ -7,6 +7,7 @@
 
   <ItemGroup>
     <Folder Include="Bing\Data\Stores\EntityFrameworkCore\" />
+    <Folder Include="Bing\Data\Filters\" />
   </ItemGroup>
 
   <ItemGroup>

framework/src/Bing.Datas.EntityFramework/Bing/Data/Filters/FilterBase.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Linq.Expressions;
+
+namespace Bing.Data.Filters
+{
+    /// <summary>
+    /// 数据过滤器基类
+    /// </summary>
+    /// <typeparam name="TFilterType">过滤器类型</typeparam>
+    public abstract class FilterBase<TFilterType> : IFilter<TFilterType> where TFilterType : class
+    {
+        /// <summary>
+        /// 过滤器是否启用
+        /// </summary>
+        public bool IsEnabled { get; private set; } = true;
+
+        /// <summary>
+        /// 实体是否启用过滤器
+        /// </summary>
+        /// <typeparam name="TEntity">实体类型</typeparam>
+        public bool IsEntityEnabled<TEntity>() => typeof(TFilterType).IsAssignableFrom(typeof(TEntity));
+
+        /// <summary>
+        /// 启用
+        /// </summary>
+        public void Enable() => IsEnabled = true;
+
+        /// <summary>
+        /// 禁用
+        /// </summary>
+        public IDisposable Disable()
+        {
+            if (IsEnabled == false)
+                return new DisposeAction(null);
+            IsEnabled = false;
+            return new DisposeAction(Enable);
+        }
+
+        /// <summary>
+        /// 获取过滤表达式
+        /// </summary>
+        /// <typeparam name="TEntity">实体类型</typeparam>
+        public abstract Expression<Func<TEntity, bool>> GetExpression<TEntity>() where TEntity : class;
+    }
+}