Added author's solutions

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 14
+VisualStudioVersion = 14.0.24720.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Dealership", "Dealership\Dealership.csproj", "{4DB3664E-CDAE-446D-8163-683F6344C24B}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4DB3664E-CDAE-446D-8163-683F6344C24B}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4DB3664E-CDAE-446D-8163-683F6344C24B}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4DB3664E-CDAE-446D-8163-683F6344C24B}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4DB3664E-CDAE-446D-8163-683F6344C24B}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Common/Constants.cs

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+namespace Dealership.Common
+{
+    public class Constants
+    {
+        // String lengths
+        public const int MinNameLength = 2;
+        public const int MaxNameLength = 20;
+        public const int MinPasswordLength = 5;
+        public const int MaxPasswordLength = 30;
+        public const int MinCategoryLength = 3;
+        public const int MaxCategoryLength = 10;
+        public const int MinMakeLength = 2;
+        public const int MaxMakeLength = 15;
+        public const int MinModelLength = 1;
+        public const int MaxModelLength = 15;
+        public const int MinCommentLength = 3;
+        public const int MaxCommentLength = 200;
+
+        // Numbers validation
+        public const int MinWheels = 2;
+        public const int MaxWheels = 10;
+        public const decimal MinPrice = 0.0m;
+        public const decimal MaxPrice = 1000000.0m;
+        public const int MinSeats = 1;
+        public const int MaxSeats = 10;
+        public const int MinCapacity = 1;
+        public const int MaxCapacity = 100;
+
+        // Strings for validation
+        public const string StringMustBeBetweenMinAndMax = "{0} must be between {1} and {2} characters long!";
+        public const string NumberMustBeBetweenMinAndMax = "{0} must be between {1} and {2}!";
+
+        // Vehicle max to add if not VIP
+        public const int MaxVehiclesToAdd = 5;
+
+        // Username pattern
+        public const string UsernamePattern = "^[A-Za-z0-9]+$";
+        public const string PasswordPattern = "^[A-Za-z0-9@*_-]+$";
+
+        // Strings for vehicles, comments and users
+        public const string InvalidSymbols = "{0} contains invalid symbols!";
+
+        public const string UserToString = "Username: {0}, FullName: {1} {2}, Role: {3}";
+
+        public const string CommentCannotBeNull = "Comment cannot be null!";
+        public const string VehicleCannotBeNull = "Vehicle cannot be null!";
+
+        public const string NotAnVipUserVehiclesAdd = "You are not VIP and cannot add more than {0} vehicles!";
+        public const string AdminCannotAddVehicles = "You are an admin and therefore cannot add vehicles!";
+
+        public const string YouAreNotTheAuthor = "You are not the author!";
+        public const string UserCannotBeNull = "User cannot be null!";
+
+        // Added additionally
+        public const string PropertyCannotBeNull = "{0} cannot be null!";
+
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Common/Enums/Role.cs

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+namespace Dealership.Common.Enums
+{
+    public enum Role
+    {
+        Normal = 0,
+        VIP = 1,
+        Admin = 2
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Common/Enums/VehicleType.cs

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+namespace Dealership.Common.Enums
+{
+    public enum VehicleType
+    {
+        Motorcycle = 2,
+        Car = 4,
+        Truck = 8
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Common/Validator.cs

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+namespace Dealership.Common
+{
+    using System;
+    using System.Text.RegularExpressions;
+
+    public static class Validator
+    {
+        public static void ValidateIntRange(int value, int min, int max, string message)
+        {
+            if (value < min || value > max)
+            {
+                throw new ArgumentException(message);
+            }
+        }
+
+        public static void ValidateDecimalRange(decimal value, decimal min, decimal max, string message)
+        {
+            if (value < min || value > max)
+            {
+                throw new ArgumentException(message);
+            }
+        }
+
+        public static void ValidateNull(object value, string message)
+        {
+            if (value == null)
+            {
+                throw new ArgumentNullException(message);
+            }
+        }
+
+        public static void ValidateSymbols(string value, string pattern, string message)
+        {
+            var regex = new Regex(pattern, RegexOptions.IgnoreCase);
+
+            if (!regex.IsMatch(value))
+            {
+                throw new ArgumentException(message);
+            }
+        }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/ICar.cs

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+namespace Dealership.Contracts
+{
+    public interface ICar
+    {
+        int Seats { get; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/IComment.cs

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+namespace Dealership.Contracts
+{
+    public interface IComment
+    {
+        string Content { get; }
+
+        string Author { get; set; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/ICommentable.cs

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+using System.Collections.Generic;
+
+namespace Dealership.Contracts
+{
+    public interface ICommentable
+    {
+        IList<IComment> Comments { get; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/IMotorcycle.cs

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+namespace Dealership.Contracts
+{
+    public interface IMotorcycle
+    {
+        string Category { get; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/IPriceable.cs

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+namespace Dealership.Contracts
+{
+    public interface IPriceable
+    {
+        decimal Price { get; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/ITruck.cs

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+namespace Dealership.Contracts
+{
+    public interface ITruck
+    {
+        int WeightCapacity { get; }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/IUser.cs

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+using Dealership.Common.Enums;
+using System.Collections.Generic;
+
+namespace Dealership.Contracts
+{
+    public interface IUser
+    {
+        string Username { get; }
+
+        string FirstName { get; }
+
+        string LastName { get; }
+
+        string Password { get; }
+
+        Role Role { get; }
+
+        IList<IVehicle> Vehicles { get; }
+
+        void AddVehicle(IVehicle vehicle);
+
+        void RemoveVehicle(IVehicle vehicle);
+
+        void AddComment(IComment commentToAdd, IVehicle vehicleToAddComment);
+
+        void RemoveComment(IComment commentToRemove, IVehicle vehicleToRemoveComment);
+
+        string PrintVehicles();
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Contracts/IVehicle.cs

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+namespace Dealership.Contracts
+{
+    using Dealership.Common.Enums;
+
+    public interface IVehicle : ICommentable, IPriceable
+    {
+        int Wheels { get; }
+
+        VehicleType Type { get; }
+
+        string Make { get; }
+
+        string Model { get;  }
+    }
+}

Topics/Exam-AuthorsSolutions/Dealership-AuthorSolution/Dealership/Dealership.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{4DB3664E-CDAE-446D-8163-683F6344C24B}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>Dealership</RootNamespace>
+    <AssemblyName>Dealership</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject />
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Common\Constants.cs" />
+    <Compile Include="Common\Enums\VehicleType.cs" />
+    <Compile Include="Common\Enums\Role.cs" />
+    <Compile Include="Common\Validator.cs" />
+    <Compile Include="Contracts\ICar.cs" />
+    <Compile Include="Contracts\IComment.cs" />
+    <Compile Include="Contracts\ICommentable.cs" />
+    <Compile Include="Contracts\IMotorcycle.cs" />
+    <Compile Include="Contracts\IPriceable.cs" />
+    <Compile Include="Contracts\ITruck.cs" />
+    <Compile Include="Contracts\IUser.cs" />
+    <Compile Include="Contracts\IVehicle.cs" />
+    <Compile Include="Engine\Command.cs" />
+    <Compile Include="Engine\DealershipEngine.cs" />
+    <Compile Include="Engine\ICommand.cs" />
+    <Compile Include="Engine\IEngine.cs" />
+    <Compile Include="Factories\DealershipFactory.cs" />
+    <Compile Include="Factories\IDealershipFactory.cs" />
+    <Compile Include="Models\Car.cs" />
+    <Compile Include="Models\Comment.cs" />
+    <Compile Include="Models\Motorcycle.cs" />
+    <Compile Include="Models\Truck.cs" />
+    <Compile Include="Models\User.cs" />
+    <Compile Include="Models\Vehicle.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Startup.cs" />
+  </ItemGroup>
+  <ItemGroup />
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>