Add project files.

2026-06-28 13:01:04 +03:00 · 2022-10-06 16:53:07 +03:00
parent 45fac5e086
commit 6f3acce7d4
38 changed files with 1051 additions and 0 deletions
@@ -0,0 +1,110 @@
+using System.Reflection;
+
+namespace PracticeCalendar.Domain.Common
+{
+    // source: https://github.com/jhewlett/ValueObject
+    public abstract class ValueObject : IEquatable<ValueObject>
+    {
+        private List<PropertyInfo>? properties;
+        private List<FieldInfo>? fields;
+
+        public static bool operator ==(ValueObject? obj1, ValueObject? obj2)
+        {
+            if (object.Equals(obj1, null))
+            {
+                if (object.Equals(obj2, null))
+                {
+                    return true;
+                }
+                return false;
+            }
+            return obj1.Equals(obj2);
+        }
+
+        public static bool operator !=(ValueObject? obj1, ValueObject? obj2)
+        {
+            return !(obj1 == obj2);
+        }
+
+        public bool Equals(ValueObject? obj)
+        {
+            return Equals(obj as object);
+        }
+
+        public override bool Equals(object? obj)
+        {
+            if (obj == null || GetType() != obj.GetType()) return false;
+
+            return GetProperties().All(p => PropertiesAreEqual(obj, p))
+                && GetFields().All(f => FieldsAreEqual(obj, f));
+        }
+
+        private bool PropertiesAreEqual(object obj, PropertyInfo p)
+        {
+            return object.Equals(p.GetValue(this, null), p.GetValue(obj, null));
+        }
+
+        private bool FieldsAreEqual(object obj, FieldInfo f)
+        {
+            return object.Equals(f.GetValue(this), f.GetValue(obj));
+        }
+
+        private IEnumerable<PropertyInfo> GetProperties()
+        {
+            if (this.properties == null)
+            {
+                this.properties = GetType()
+                    .GetProperties(BindingFlags.Instance | BindingFlags.Public)
+                    .Where(p => p.GetCustomAttribute(typeof(IgnoreMemberAttribute)) == null)
+                    .ToList();
+
+                // Not available in Core
+                // !Attribute.IsDefined(p, typeof(IgnoreMemberAttribute))).ToList();
+            }
+
+            return this.properties;
+        }
+
+        private IEnumerable<FieldInfo> GetFields()
+        {
+            if (this.fields == null)
+            {
+                this.fields = GetType().GetFields(BindingFlags.Instance | BindingFlags.Public)
+                    .Where(p => p.GetCustomAttribute(typeof(IgnoreMemberAttribute)) == null)
+                    .ToList();
+            }
+
+            return this.fields;
+        }
+
+        public override int GetHashCode()
+        {
+            unchecked   //allow overflow
+            {
+                int hash = 17;
+                foreach (var prop in GetProperties())
+                {
+                    var value = prop.GetValue(this, null);
+                    hash = HashValue(hash, value);
+                }
+
+                foreach (var field in GetFields())
+                {
+                    var value = field.GetValue(this);
+                    hash = HashValue(hash, value);
+                }
+
+                return hash;
+            }
+        }
+
+        private int HashValue(int seed, object? value)
+        {
+            var currentHash = value != null
+                ? value.GetHashCode()
+                : 0;
+
+            return seed * 23 + currentHash;
+        }
+    }
+}