AgeValueGenerator generates from DOB when available

ModelBuilder.UnitTests/Scenarios/ScenarioTests.cs

@@ -13,6 +13,7 @@
     using ModelBuilder.Data;
     using ModelBuilder.TypeCreators;
     using ModelBuilder.UnitTests.Models;
+    using ModelBuilder.UnitTests.ValueGenerators;
     using ModelBuilder.ValueGenerators;
     using NSubstitute;
     using NSubstitute.ExceptionExtensions;
@@ -411,6 +412,17 @@ public void CreateReturnsString()
             actual.Should().NotBeNullOrWhiteSpace();
         }
 
+        [Fact]
+        public void CreatesAgeFromDob()
+        {
+            var actual = Model.Create<AgeFromDob>();
+
+            var span = DateTime.Now.Subtract(actual.DateOfBirth);
+            var years = Convert.ToInt32(Math.Floor(span.TotalDays / 365));
+
+            actual.Age.Should().Be(years);
+        }
+
         [Fact]
         public void CreatesCircularReferenceWithInstanceFromBuildChain()
         {

ModelBuilder.UnitTests/ValueGenerators/AgeFromDob.cs

@@ -0,0 +1,10 @@
+namespace ModelBuilder.UnitTests.ValueGenerators
+{
+    using System;
+
+    public class AgeFromDob
+    {
+        public int Age { get; set; }
+        public DateTime DateOfBirth { get; set; }
+    }
+}

ModelBuilder.UnitTests/ValueGenerators/AgeValueGeneratorTests.cs

@@ -9,6 +9,62 @@
 
     public class AgeValueGeneratorTests
     {
+        [Theory]
+        [InlineData(5, 0)]
+        [InlineData(364, 0)]
+        [InlineData(365, 1)]
+        [InlineData(400, 1)]
+        [InlineData(365 * 99 + 10, 99)]
+        public void CanAssignAgeFromDob(int daysOld, int expectedYears)
+        {
+            var dob = DateTime.Now.AddDays(-daysOld);
+
+            var model = new AgeFromDob
+            {
+                DateOfBirth = dob
+            };
+
+            var executeStrategy = Substitute.For<IExecuteStrategy>();
+
+            var buildChain = new BuildHistory();
+
+            buildChain.Push(model);
+
+            executeStrategy.BuildChain.Returns(buildChain);
+
+            var sut = new Wrapper {MinAge = 15, MaxAge = 30};
+
+            var actual = (int) sut.RunGenerate(typeof(int), "age", executeStrategy);
+
+            actual.Should().Be(expectedYears);
+        }
+
+        [Fact]
+        public void GenerateReturnsRandomValueWhenDobInFuture()
+        {
+            var dob = DateTime.Now.AddDays(1);
+
+            var model = new AgeFromDob
+            {
+                DateOfBirth = dob
+            };
+
+            var executeStrategy = Substitute.For<IExecuteStrategy>();
+
+            var buildChain = new BuildHistory();
+
+            buildChain.Push(model);
+
+            executeStrategy.BuildChain.Returns(buildChain);
+
+            var sut = new Wrapper {MinAge = 15, MaxAge = 30};
+
+            var actual = (int) sut.RunGenerate(typeof(int), "age", executeStrategy);
+
+            actual.Should().BeGreaterOrEqualTo(15);
+            actual.Should().BeLessOrEqualTo(30);
+        }
+
         [Theory]
         [ClassData(typeof(NumericTypeRangeDataSource))]
         public void GenerateReturnsValuesBetweenMinAndMaxTest(Type type, bool typeSupported, double min, double max)
@@ -54,6 +110,28 @@ public void GenerateReturnsValuesBetweenMinAndMaxTest(Type type, bool typeSuppor
             }
         }
 
+        [Fact]
+        public void GenerateThrowsExceptionWithNullExecuteStrategy()
+        {
+            var sut = new Wrapper();
+
+            Action action = () => sut.RunGenerate(typeof(string), "Age", null);
+
+            action.Should().Throw<ArgumentNullException>();
+        }
+
+        [Fact]
+        public void GenerateThrowsExceptionWithNullType()
+        {
+            var executeStrategy = Substitute.For<IExecuteStrategy>();
+
+            var sut = new Wrapper();
+
+            Action action = () => sut.RunGenerate(null, "Age", executeStrategy);
+
+            action.Should().Throw<ArgumentNullException>();
+        }
+
         [Theory]
         [ClassData(typeof(NumericTypeDataSource))]
         public void IsMatchEvaluatesRequestedTypeTest(Type type, bool typeSupported)
@@ -124,6 +202,28 @@ public void IsMatchReturnsWhetherTypeIsSupported(Type type, bool typeSupported)
             actual.Should().BeTrue();
         }
 
+        [Fact]
+        public void IsMatchThrowsExceptionWithNullExecuteStrategy()
+        {
+            var sut = new Wrapper();
+
+            Action action = () => sut.RunIsMatch(typeof(string), "Age", null);
+
+            action.Should().Throw<ArgumentNullException>();
+        }
+
+        [Fact]
+        public void IsMatchThrowsExceptionWithNullType()
+        {
+            var buildChain = Substitute.For<IBuildChain>();
+
+            var sut = new Wrapper();
+
+            Action action = () => sut.RunIsMatch(null, "Age", buildChain);
+
+            action.Should().Throw<ArgumentNullException>();
+        }
+
         [Fact]
         public void MaxAgeDefaultsTo100()
         {

ModelBuilder/DefaultConfigurationModule.cs

@@ -28,21 +28,23 @@ public void Configure(IBuildConfiguration configuration)
 
         private static void AddExecuteOrderRules(IBuildConfiguration configuration)
         {
+            // Populate personal properties in a specific order for scenarios where a value generator may use the values in order to set other values
+            configuration.AddExecuteOrderRule(PropertyExpression.Gender, 9600);
+            configuration.AddExecuteOrderRule(PropertyExpression.FirstName, 9580);
+            configuration.AddExecuteOrderRule(PropertyExpression.LastName, 9560);
+            configuration.AddExecuteOrderRule(PropertyExpression.Domain, 9550);
+            configuration.AddExecuteOrderRule(PropertyExpression.Email, 9540);
+            configuration.AddExecuteOrderRule(PropertyExpression.Country, 9400);
+            configuration.AddExecuteOrderRule(PropertyExpression.State, 9390);
+            configuration.AddExecuteOrderRule(PropertyExpression.City, 9380);
+            configuration.AddExecuteOrderRule(PropertyExpression.PostCode, 9370);
+            configuration.AddExecuteOrderRule(PropertyExpression.TimeZone, 9360);
+            configuration.AddExecuteOrderRule(PropertyExpression.DateOfBirth, 9340);
+            configuration.AddExecuteOrderRule(PropertyExpression.Age, 9320);
+
             configuration.AddExecuteOrderRule(x => x.PropertyType.IsEnum, 4000);
             configuration.AddExecuteOrderRule(x => x.PropertyType.IsValueType, 3000);
 
-            // Populate personal properties in a specific order for scenarios where a value generator may use the values in order to set other values
-            configuration.AddExecuteOrderRule(PropertyExpression.Gender, 2600);
-            configuration.AddExecuteOrderRule(PropertyExpression.FirstName, 2580);
-            configuration.AddExecuteOrderRule(PropertyExpression.LastName, 2560);
-            configuration.AddExecuteOrderRule(PropertyExpression.Domain, 2550);
-            configuration.AddExecuteOrderRule(PropertyExpression.Email, 2540);
-            configuration.AddExecuteOrderRule(PropertyExpression.Country, 2400);
-            configuration.AddExecuteOrderRule(PropertyExpression.State, 2390);
-            configuration.AddExecuteOrderRule(PropertyExpression.City, 2380);
-            configuration.AddExecuteOrderRule(PropertyExpression.PostCode, 2370);
-            configuration.AddExecuteOrderRule(PropertyExpression.TimeZone, 2360);
-
             // Populate strings before other reference types
             configuration.AddExecuteOrderRule(x => x.PropertyType == typeof(string), 2000);
             configuration.AddExecuteOrderRule(x => x.PropertyType.IsClass, 1000);

ModelBuilder/PropertyExpression.cs

@@ -8,6 +8,11 @@
     /// </summary>
     public static class PropertyExpression
     {
+        /// <summary>
+        ///     Defines the expression for matching age properties.
+        /// </summary>
+        public static readonly Regex Age = new Regex("Age", RegexOptions.IgnoreCase);
+
         /// <summary>
         ///     Defines the expression for matching city properties.
         /// </summary>
@@ -18,6 +23,11 @@ public static class PropertyExpression
         /// </summary>
         public static readonly Regex Country = new Regex("Country", RegexOptions.IgnoreCase);
 
+        /// <summary>
+        ///     Defines the expression for matching DOB properties.
+        /// </summary>
+        public static readonly Regex DateOfBirth = new Regex("dob|dateofbirth|born", RegexOptions.IgnoreCase);
+
         /// <summary>
         ///     Defines the expression for matching domain properties.
         /// </summary>

ModelBuilder/ValueGenerators/AgeValueGenerator.cs

@@ -6,16 +6,81 @@
     ///     The <see cref="AgeValueGenerator" />
     ///     class is used to generate numbers that should represent a persons age.
     /// </summary>
-    public class AgeValueGenerator : NumericValueGenerator
+    public class AgeValueGenerator : RelativeValueGenerator
     {
+        /// <summary>
+        ///     Initializes a new instance of the <see cref="AddressValueGenerator" /> class.
+        /// </summary>
+        public AgeValueGenerator() : base(PropertyExpression.Age)
+        {
+        }
+
+        /// <inheritdoc />
+        protected override object Generate(IExecuteStrategy executeStrategy, Type type, string referenceName)
+        {
+            if (type == null)
+            {
+                throw new ArgumentNullException(nameof(type));
+            }
+
+            if (executeStrategy == null)
+            {
+                throw new ArgumentNullException(nameof(executeStrategy));
+            }
+
+            var generateType = type;
+
+            if (generateType.IsNullable())
+            {
+                // Allow for a 10% the chance that this might be null
+                var range = Generator.NextValue(0, 100000);
+
+                if (range < 10000)
+                {
+                    return null;
+                }
+
+                // Hijack the type to generator so we can continue with the normal code pointed at the correct type to generate
+                generateType = type.GetGenericArguments()[0];
+            }
+
+            var context = executeStrategy?.BuildChain?.Last;
+
+            if (context == null)
+            {
+                return Generator.NextValue(generateType, MinAge, MaxAge);
+            }
+
+            // Check if there is a DOB value
+            var dob = GetValue<DateTime>(PropertyExpression.DateOfBirth, context);
+
+            if (dob == default)
+            {
+                return Generator.NextValue(generateType, MinAge, MaxAge);
+            }
+
+            // Calculate the age from this DOB
+            var totalDays = DateTime.Now.Subtract(dob).TotalDays;
+
+            if (totalDays > 0)
+            {
+                return Convert.ChangeType(Math.Floor(totalDays / 365), type);
+            }
+
+            return Generator.NextValue(generateType, MinAge, MaxAge);
+        }
+
         /// <inheritdoc />
         protected override bool IsMatch(IBuildChain buildChain, Type type, string referenceName)
         {
-            var baseSupported = base.IsMatch(buildChain, type, referenceName);
+            if (type == null)
+            {
+                throw new ArgumentNullException(nameof(type));
+            }
 
-            if (baseSupported == false)
+            if (buildChain == null)
             {
-                return false;
+                throw new ArgumentNullException(nameof(buildChain));
             }
 
             if (string.IsNullOrEmpty(referenceName))
@@ -24,24 +89,20 @@ protected override bool IsMatch(IBuildChain buildChain, Type type, string refere
                 return false;
             }
 
-            if (referenceName.IndexOf("age", StringComparison.OrdinalIgnoreCase) > -1)
+            if (PropertyExpression.Age.IsMatch(referenceName) == false)
             {
-                return true;
+                return false;
             }
 
-            return false;
-        }
+            if (type.IsNullable())
+            {
+                // Get the internal type
+                var internalType = type.GetGenericArguments()[0];
 
-        /// <inheritdoc />
-        protected override object GetMaximum(Type type, string referenceName, object context)
-        {
-            return MaxAge;
-        }
+                return Generator.IsSupported(internalType);
+            }
 
-        /// <inheritdoc />
-        protected override object GetMinimum(Type type, string referenceName, object context)
-        {
-            return MinAge;
+            return Generator.IsSupported(type);
         }
 
         /// <summary>

ModelBuilder/ValueGenerators/DateOfBirthValueGenerator.cs

@@ -1,21 +1,18 @@
 namespace ModelBuilder.ValueGenerators
 {
     using System;
-    using System.Text.RegularExpressions;
 
     /// <summary>
     ///     The <see cref="DateOfBirthValueGenerator" />
     ///     class is used to generate random date of birth values.
     /// </summary>
     public class DateOfBirthValueGenerator : ValueGeneratorMatcher
     {
-        private static readonly Regex _matchNameExpression = new Regex("dob|dateofbirth|born", RegexOptions.IgnoreCase);
-
         /// <summary>
         ///     Initializes a new instance of the <see cref="DateTimeValueGenerator" /> class.
         /// </summary>
         public DateOfBirthValueGenerator() : base(
-            _matchNameExpression,
+            PropertyExpression.DateOfBirth,
             typeof(DateTime),
             typeof(DateTime?),
             typeof(DateTimeOffset),