Entity validation infrastructure. related #1

src/PetStore.Core/DomainObjects/IValidatable.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace PetStore.Core.DomainObjects
+{
+    /// <summary>
+    /// Must be implemented by entities that would be validated.
+    /// </summary>
+    /// <typeparam name="TEntity">Entity</typeparam>
+    public interface IValidatable<out TEntity>
+    {
+        /// <summary>
+        /// Validates the entity
+        /// </summary>
+        /// <param name="validator">Validator responsible for validating the given entity (ref: TEntity).</param>
+        /// <param name="brokenRules">Errors list.</param>
+        /// <returns>True if the entity is valid. Otherwise, false.</returns>
+        bool Validate(IValidator<TEntity> validator, out IList<string> brokenRules);
+    }
+}

src/PetStore.Core/DomainObjects/IValidator.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace PetStore.Core.DomainObjects
+{
+    /// <summary>
+    /// Validates an entity
+    /// </summary>
+    /// <typeparam name="TEntity">Entity</typeparam>
+    public interface IValidator<in TEntity>
+    {
+        /// <summary>
+        /// Validates an entity and returns the errors list. 
+        /// (Or an empty list if there is no error).
+        /// </summary>
+        /// <param name="obj">Entity to be validated.</param>
+        /// <returns>Errors list.</returns>
+        IList<string> BrokenRules(TEntity obj);
+    }
+}

src/PetStore.Core/DomainObjects/ValidationException.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.Serialization;
+using System.Text;
+using PetStore.Resources;
+
+namespace PetStore.Core.DomainObjects
+{
+    /// <summary>
+    /// Exception that represents an error on an entity's validation.
+    /// </summary>
+    public class ValidationException : DomainException
+    {
+        #region Constructors
+
+        public ValidationException()
+            : this(GeneralResources.ValidationExceptionDefaultMessage)
+        {
+        }
+
+        public ValidationException(string message)
+            : base(message)
+        {
+        }
+
+        public ValidationException(string message, Exception innerException)
+            : base(message, innerException)
+        {
+        }
+
+        public ValidationException(SerializationInfo info, StreamingContext context)
+            : base(info, context)
+        {
+        }
+
+        public ValidationException(string mainMessage, IList<string> brokenRules)
+            : this(CreateBrokenRulesMessage(mainMessage, brokenRules))
+        {
+            BrokenRules = brokenRules;
+        }
+
+        #endregion
+
+        #region Properties
+
+        /// <summary>
+        /// Validation rules that were broken.
+        /// </summary>
+        public IList<string> BrokenRules { get; private set; }
+
+        #endregion
+
+        #region Private Methods
+
+        private static string CreateBrokenRulesMessage(string mainMessage, IEnumerable<string> brokenRules)
+        {
+            StringBuilder sbMessage = new StringBuilder();
+            sbMessage.Append(mainMessage);
+            foreach (var brokenRule in brokenRules)
+            {
+                sbMessage.Append(" ");
+                sbMessage.Append(brokenRule);
+            }
+
+            return sbMessage.ToString();
+        }
+
+        #endregion
+    }
+}

src/PetStore.Core/PetStore.Core.csproj

@@ -42,6 +42,9 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="DomainException.cs" />
+    <Compile Include="DomainObjects\IValidatable.cs" />
+    <Compile Include="DomainObjects\IValidator.cs" />
+    <Compile Include="DomainObjects\ValidationException.cs" />
     <Compile Include="Extension\StringExtension.cs" />
     <Compile Include="Helper\Check.cs" />
     <Compile Include="Helper\DataValidator.cs" />