commit

CandyHouseSolution/CandyHouseContracts/Mapper/AlternativeNameAttribute.cs

@@ -0,0 +1,12 @@
+namespace MagicCarpetContracts.Mapper;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = true)]
+public class AlternativeNameAttribute : Attribute
+{
+    public string AlternativeName { get; }
+
+    public AlternativeNameAttribute(string alternativeName)
+    {
+        AlternativeName = alternativeName;
+    }
+}

CandyHouseSolution/CandyHouseContracts/Mapper/CustomMapper.cs

@@ -0,0 +1,281 @@
+using System.Collections;
+using System.ComponentModel;
+using System.Reflection;
+
+namespace MagicCarpetContracts.Mapper;
+
+internal static class CustomMapper
+{
+    public static To MapObject<To>(object obj, To newObject)
+    {
+        ArgumentNullException.ThrowIfNull(obj);
+        ArgumentNullException.ThrowIfNull(newObject);
+
+        var typeFrom = obj.GetType();
+        var typeTo = newObject.GetType();
+
+        var propertiesFrom = typeFrom.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
+                                     .Where(x => x.CanRead)
+                                     .ToArray();
+
+        // свойств
+        foreach (var property in typeTo.GetProperties(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
+                                       .Where(x => x.CanWrite))
+        {
+            if (property.GetCustomAttribute<IgnoreMappingAttribute>() is not null)
+                continue;
+
+            var propertyFrom = TryGetPropertyFrom(property, propertiesFrom);
+            if (propertyFrom is null)
+            {
+                FindAndMapDefaultValue(property, newObject);
+                continue;
+            }
+
+            var fromValue = propertyFrom.GetValue(obj);
+            var postProcessingAttribute = property.GetCustomAttribute<PostProcessingAttribute>();
+            if (postProcessingAttribute is not null)
+            {
+                var value = PostProcessing(fromValue, postProcessingAttribute, newObject);
+                if (value is not null)
+                {
+                    property.SetValue(newObject, value);
+                }
+                continue;
+            }
+
+            if (propertyFrom.PropertyType.IsGenericType && propertyFrom.PropertyType.Name.StartsWith("List") && fromValue is not null)
+            {
+                fromValue = MapListOfObjects(property, fromValue);
+            }
+
+            if (propertyFrom.PropertyType.IsEnum && property.PropertyType == typeof(string) && fromValue != null)
+            {
+                fromValue = fromValue.ToString();
+            }
+            else if (!propertyFrom.PropertyType.IsEnum && property.PropertyType.IsEnum && fromValue is not null)
+            {
+                if (fromValue is string stringValue)
+                    fromValue = Enum.Parse(property.PropertyType, stringValue);
+                else
+                    fromValue = Enum.ToObject(property.PropertyType, fromValue);
+            }
+
+            if (fromValue is not null)
+            {
+                if (propertyFrom.PropertyType.IsClass
+                    && property.PropertyType.IsClass
+                    && propertyFrom.PropertyType != typeof(string)
+                    && property.PropertyType != typeof(string)
+                    && !property.PropertyType.IsAssignableFrom(propertyFrom.PropertyType))
+                {
+                    try
+                    {
+                        var nestedInstance = Activator.CreateInstance(property.PropertyType);
+                        if (nestedInstance != null)
+                        {
+                            var nestedMapped = MapObject(fromValue, nestedInstance);
+                            property.SetValue(newObject, nestedMapped);
+                            continue;
+                        }
+                    }
+                    catch
+                    {
+                        // ignore
+                    }
+                }
+
+                property.SetValue(newObject, fromValue);
+            }
+        }
+
+        // полей
+        var fieldsTo = typeTo.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
+        var fieldsFrom = typeFrom.GetFields(BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
+
+        foreach (var field in fieldsTo)
+        {
+            if (field.Name.Contains("k__BackingField"))
+                continue;
+
+            if (field.GetCustomAttribute<IgnoreMappingAttribute>() is not null)
+                continue;
+
+            var sourceField = fieldsFrom.FirstOrDefault(f => f.Name == field.Name);
+            object? fromValue = null;
+
+            if (sourceField is not null)
+            {
+                fromValue = sourceField.GetValue(obj);
+            }
+            else
+            {
+                var propertyName = field.Name.TrimStart('_');
+                var sourceProperty = typeFrom.GetProperty(propertyName, BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic);
+                if (sourceProperty is not null && sourceProperty.CanRead)
+                {
+                    fromValue = sourceProperty.GetValue(obj);
+                }
+            }
+
+            if (fromValue is null)
+                continue;
+
+            if (field.FieldType.IsClass && field.FieldType != typeof(string))
+            {
+                try
+                {
+                    var nested = Activator.CreateInstance(field.FieldType)!;
+                    var mapped = MapObject(fromValue, nested);
+                    RemoveReadOnly(field);
+                    field.SetValue(newObject, mapped);
+                    continue;
+                }
+                catch
+                {
+                    // ignore
+                }
+            }
+
+            RemoveReadOnly(field);
+            field.SetValue(newObject, fromValue);
+        }
+
+        var classPostProcessing = typeTo.GetCustomAttribute<PostProcessingAttribute>();
+        if (classPostProcessing is not null && classPostProcessing.MappingCallMethodName is not null)
+        {
+            var methodInfo = typeTo.GetMethod(classPostProcessing.MappingCallMethodName, BindingFlags.NonPublic | BindingFlags.Instance);
+            methodInfo?.Invoke(newObject, []);
+        }
+
+        return newObject;
+    }
+
+    private static void RemoveReadOnly(FieldInfo field)
+    {
+        if (!field.IsInitOnly)
+            return;
+
+        var attr = typeof(FieldInfo).GetField("m_fieldAttributes", BindingFlags.Instance | BindingFlags.NonPublic);
+        if (attr != null)
+        {
+            var current = (FieldAttributes)attr.GetValue(field)!;
+            attr.SetValue(field, current & ~FieldAttributes.InitOnly);
+        }
+    }
+
+    public static To MapObject<To>(object obj) => MapObject(obj, Activator.CreateInstance<To>()!);
+
+    public static To? MapObjectWithNull<To>(object? obj) => obj is null ? default : MapObject(obj, Activator.CreateInstance<To>());
+
+    private static PropertyInfo? TryGetPropertyFrom(PropertyInfo propertyTo, PropertyInfo[] propertiesFrom)
+    {
+        var customAttribute = propertyTo.GetCustomAttributes<AlternativeNameAttribute>()?
+            .ToArray()
+            .FirstOrDefault(x => propertiesFrom.Any(y => y.Name == x.AlternativeName));
+        if (customAttribute is not null)
+        {
+            return propertiesFrom.FirstOrDefault(x => x.Name == customAttribute.AlternativeName);
+        }
+        return propertiesFrom.FirstOrDefault(x => x.Name == propertyTo.Name);
+    }
+
+    private static object? PostProcessing<T>(object? value, PostProcessingAttribute postProcessingAttribute, T newObject)
+    {
+        if (value is null || newObject is null)
+        {
+            return null;
+        }
+        if (!string.IsNullOrEmpty(postProcessingAttribute.MappingCallMethodName))
+        {
+            var methodInfo =
+                newObject.GetType().GetMethod(postProcessingAttribute.MappingCallMethodName, BindingFlags.NonPublic | BindingFlags.Instance);
+            if (methodInfo is not null)
+            {
+                return methodInfo.Invoke(newObject, [value]);
+            }
+        }
+        else if (postProcessingAttribute.ActionType != PostProcessingType.None)
+        {
+            switch (postProcessingAttribute.ActionType)
+            {
+                case PostProcessingType.ToUniversalTime:
+                    return ToUniversalTime(value);
+                case PostProcessingType.ToLocalTime:
+                    return ToLocalTime(value);
+            }
+        }
+        return null;
+    }
+
+    private static object? ToLocalTime(object? obj)
+    {
+        if (obj is DateTime date)
+            return date.ToLocalTime();
+        return obj;
+    }
+
+    private static object? ToUniversalTime(object? obj)
+    {
+        if (obj is DateTime date)
+            return date.ToUniversalTime();
+        return obj;
+    }
+
+    private static void FindAndMapDefaultValue<T>(PropertyInfo property, T newObject)
+    {
+        var defaultValueAttribute = property.GetCustomAttribute<DefaultValueAttribute>();
+        if (defaultValueAttribute is null)
+        {
+            return;
+        }
+        if (defaultValueAttribute.DefaultValue is not null)
+        {
+            property.SetValue(newObject, defaultValueAttribute.DefaultValue);
+            return;
+        }
+
+        var value = defaultValueAttribute.Func switch
+        {
+            DefaultValueFunc.UtcNow => DateTime.UtcNow,
+            _ => (object?)null,
+        };
+        if (value is not null)
+        {
+            property.SetValue(newObject, value);
+        }
+    }
+
+    private static object? MapListOfObjects(PropertyInfo propertyTo, object list)
+    {
+        var listResult = Activator.CreateInstance(propertyTo.PropertyType);
+        var elementType = propertyTo.PropertyType.GenericTypeArguments[0];
+
+        foreach (var elem in (IEnumerable)list)
+        {
+            object? newElem;
+
+            if (elementType.IsPrimitive || elementType == typeof(string) || elementType == typeof(decimal) || elementType == typeof(DateTime))
+            {
+                newElem = elem;
+            }
+            else
+            {
+                newElem = MapObject(elem, Activator.CreateInstance(elementType)!);
+            }
+
+            if (newElem is not null)
+            {
+                propertyTo.PropertyType.GetMethod("Add")!.Invoke(listResult, [newElem]);
+            }
+        }
+
+        return listResult;
+    }
+}
+
+enum DefaultValueFunc
+{
+    None,
+    UtcNow
+}

CandyHouseSolution/CandyHouseContracts/Mapper/DefaultValueAttribute.cs

@@ -0,0 +1,12 @@
+namespace MagicCarpetContracts.Mapper;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Class)]
+class DefaultValueAttribute : Attribute
+{
+    public object? DefaultValue { get; set; }
+
+    public string? FuncName { get; set; }
+
+    public DefaultValueFunc Func { get; set; } = DefaultValueFunc.None;
+
+}

CandyHouseSolution/CandyHouseContracts/Mapper/IgnoreMappingAttribute.cs

@@ -0,0 +1,6 @@
+namespace MagicCarpetContracts.Mapper;
+
+[AttributeUsage(AttributeTargets.Property)]
+class IgnoreMappingAttribute : Attribute
+{
+}

CandyHouseSolution/CandyHouseContracts/Mapper/PostProcessingAttribute.cs

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+namespace MagicCarpetContracts.Mapper;
+
+[AttributeUsage(AttributeTargets.Property | AttributeTargets.Class | AttributeTargets.Field)]
+class PostProcessingAttribute : Attribute
+{
+    public string? MappingCallMethodName { get; set; }
+
+    public PostProcessingType ActionType { get; set; } = PostProcessingType.None;
+}

CandyHouseSolution/CandyHouseContracts/Mapper/PostProcessingType.cs

@@ -0,0 +1,10 @@
+namespace MagicCarpetContracts.Mapper;
+
+enum PostProcessingType
+{
+    None = -1,
+
+    ToUniversalTime = 1,
+
+    ToLocalTime = 2
+}