implement GA - Get Attribute Method for static method calls

mocha-dotnet/src/lib/Mocha.Core/KnownInstanceGuids.cs

@@ -90,6 +90,8 @@ namespace Mocha.Core
 			public static Guid ExecutableReturningElement { get; } = new Guid("{a15a4f52-1f1a-4ef3-80a7-033d45cc0548}");
 			public static Guid ExecutableReturningWorkData { get; } = new Guid("{a0365b76-ad1f-462e-84da-d6a1d5b9c88c}");
 
+			public static Guid Calculation { get; } = new Guid("{ab4fdf54-b8b7-4b07-bdaf-2548bdb4c290}");
+
 			public static Guid Event { get; set; } = new Guid("{ca727ecd-8536-4aeb-9e75-352dbb958767}");
 
 			public static Guid WorkData { get; set; } = new Guid("{05e8f023-88cb-416b-913e-75299e665eb2}");

mocha-dotnet/src/lib/Mocha.Core/KnownRelationshipGuids.cs

@@ -451,5 +451,8 @@ namespace Mocha.Core
 		public static Guid Numeric_Attribute__returned_by__Calculate_Numeric_Method { get; } = new Guid("{03275ef5-c9cf-4816-a4f5-4f3aaf0f9479}");
 
 		public static Guid Arithmetic_Calculation__has__Arithmetic_Operator { get; } = new Guid("{f286edc6-0875-41bf-8fe9-127b8c0664ae}");
+
+		public static Guid Arithmetic_Calculation__has_first_operand__Calculation { get; } = new Guid("{4f002495-dee4-4eca-8a15-beb8f928648d}");
+		public static Guid Arithmetic_Calculation__has_second_operand__Calculation { get; } = new Guid("{0d74918d-5e7b-4492-9fa4-e35558f40ef3}");
     }
 }

mocha-dotnet/src/lib/Mocha.Core/MethodImplementations/CalculateNumericMethodImplementation.cs

@@ -39,8 +39,30 @@ public class CalculateNumericMethodImplementation : MethodImplementation
 			throw new InvalidOperationException("no Arithmetic Operator specified for Arithmetic Calculation");
 		}
 
-		decimal primaryOperandValue = oms.GetAttributeValue<decimal>(method, oms.GetInstance(KnownAttributeGuids.Numeric.PrimaryOperandValue));
-		decimal secondaryOperandValue = oms.GetAttributeValue<decimal>(method, oms.GetInstance(KnownAttributeGuids.Numeric.SecondaryOperandValue));
+		decimal primaryOperandValue = 0.0M;
+		decimal secondaryOperandValue = 0.0M;
+
+		if (oms.TryGetAttributeValue<decimal>(method, oms.GetInstance(KnownAttributeGuids.Numeric.PrimaryOperandValue), out decimal v))
+		{
+			primaryOperandValue = v;
+		}
+		else
+		{
+			InstanceHandle hFirstOperand = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Arithmetic_Calculation__has_first_operand__Calculation));
+			InstanceHandle hResult = oms.Execute(context, hFirstOperand);
+			primaryOperandValue = context.GetWorkData<decimal>(hResult);
+		}
+
+		if (oms.TryGetAttributeValue<decimal>(method, oms.GetInstance(KnownAttributeGuids.Numeric.SecondaryOperandValue), out decimal v2))
+		{
+			secondaryOperandValue = v2;
+		}
+		else
+		{
+			InstanceHandle hSecondOperand = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Arithmetic_Calculation__has_second_operand__Calculation));
+			InstanceHandle hResult = oms.Execute(context, hSecondOperand);
+			secondaryOperandValue = context.GetWorkData<decimal>(hResult);
+		}
 
 		decimal value = 0.0M;
 		if (arithmeticOperator.Equals(ArithmeticOperator.Add))

mocha-dotnet/src/lib/Mocha.Core/MethodImplementations/GetAttributeMethodImplementation.cs

@@ -24,21 +24,35 @@ public class GetAttributeMethodImplementation : MethodImplementation
     {
 		InstanceHandle irForClass = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Method__for__Class));
 		InstanceHandle returnsAttribute = oms.GetRelatedInstance(method, oms.GetInstance(KnownRelationshipGuids.Get_Attribute_Method__returns__Attribute));
-		
+		bool isStatic = oms.GetAttributeValue<bool>(method, oms.GetInstance(KnownAttributeGuids.Boolean.Static));
+
 		if (returnsAttribute == InstanceHandle.Empty)
 		{
 			throw new InvalidOperationException("no Work Set specified for method");
 		}
 
-		IInstanceReference? forInstance = (IInstanceReference?) context.GetWorkData(irForClass);
-		if (forInstance == null)
+		IInstanceReference? forInstance = null;
+		if (isStatic)
 		{
-			throw new NullReferenceException(String.Format("non-static method call without instance reference {0}", oms.GetGlobalIdentifier(irForClass)));
+			forInstance = irForClass;
+			if (forInstance == null)
+			{
+				// we should never get here
+				// throw new NullReferenceException(String.Format("static method call without instance reference {0}", oms.GetGlobalIdentifier(irForClass)));
+			}
+		}
+		else
+		{
+			forInstance = (IInstanceReference?)context.GetWorkData(irForClass);
+			if (forInstance == null)
+			{
+				throw new NullReferenceException(String.Format("non-static method call without instance reference {0}", oms.GetGlobalIdentifier(irForClass)));
+			}
 		}
 
 		if (oms.IsInstanceOf(forInstance, oms.GetInstance(KnownInstanceGuids.Classes.WorkSet)))
 		{
-			forInstance = (InstanceHandle?) context.GetWorkData(forInstance);
+			forInstance = (InstanceHandle?)context.GetWorkData(forInstance);
 		}
 
 		if (forInstance is InstanceHandle forInstanceHandle)

mocha-dotnet/src/lib/Mocha.Core/Oms.cs

@@ -402,8 +402,18 @@ public abstract class Oms
 			InstanceHandle ihSourceClass = GetRelatedInstance(relationship, GetInstance(KnownRelationshipGuids.Relationship__has_source__Class));
 			InstanceHandle ihDestinationClass = GetRelatedInstance(relationship, GetInstance(KnownRelationshipGuids.Relationship__has_destination__Class));
 			List<InstanceHandle> ignoreClasses = new List<InstanceHandle>();
-			ignoreClasses.Add(GetInstance(KnownInstanceGuids.Classes.Instance));
-			ignoreClasses.Add(GetInstance(KnownInstanceGuids.Classes.ExecutableReturningWorkData));
+			if (TryGetInstance(KnownInstanceGuids.Classes.Instance, out InstanceHandle __ih_1))
+			{
+				ignoreClasses.Add(__ih_1);
+			}
+			if (TryGetInstance(KnownInstanceGuids.Classes.ExecutableReturningWorkData, out InstanceHandle __ih_2))
+			{
+				ignoreClasses.Add(__ih_2);
+			}
+			if (TryGetInstance(KnownInstanceGuids.Classes.Calculation, out InstanceHandle __ih_3))
+			{
+				ignoreClasses.Add(__ih_3);
+			}
 
 			if (ihSourceClass != InstanceHandle.Empty)
 			{

mocha-dotnet/src/lib/Mocha.Core/OmsMethodBuilder.cs

@@ -391,4 +391,14 @@ public class OmsMethodBuilder
 		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Calculate_Numeric_Method__returns__Numeric_Attribute), returnsAttribute.GetHandle());
 		return new CalculateNumericMethod(method);
 	}
+
+	public CalculateNumericMethod CreateCalculateNumericMethod(InstanceHandle clasz, string verb, string name, AccessModifier accessModifier, bool isStatic, IInstanceReference returnsAttribute, IInstanceReference primaryOperand, ArithmeticOperator oper, decimal secondaryOperand)
+	{
+		InstanceHandle method = CreateMethodBase(Oms.GetInstance(KnownInstanceGuids.MethodClasses.CalculateNumericMethod), clasz, verb, name, accessModifier, isStatic);
+		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Arithmetic_Calculation__has_first_operand__Calculation), primaryOperand);
+		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Arithmetic_Calculation__has__Arithmetic_Operator), oper.GetHandle());
+		Oms.SetAttributeValue(method, Oms.GetInstance(KnownAttributeGuids.Numeric.SecondaryOperandValue), secondaryOperand);
+		Oms.AssignRelationship(method, Oms.GetInstance(KnownRelationshipGuids.Calculate_Numeric_Method__returns__Numeric_Attribute), returnsAttribute.GetHandle());
+		return new CalculateNumericMethod(method);
+	}
 }

mocha-dotnet/tests/Mocha.Core.Tests/MethodTests/CalculateNumericMethodTests.cs

@@ -161,6 +161,37 @@ namespace Mocha.Core.Tests.MethodTests
 
 			Assert.That(value, Is.EqualTo(test_result));
 		}
+
+
+		[Test]
+		public void Add_GA_Plus_Literal_Number_Test()
+		{
+			InstanceHandle irTestClass = Oms.GetInstance(TEST_CLASS_GUID);
+			InstanceHandle irTestClassInstance = Oms.CreateInstanceOf(irTestClass);
+			decimal test_value = 20.0M;
+
+			InstanceHandle irAttribute = Oms.GetInstance(KnownAttributeGuids.Numeric.MaximumLength);
+			Oms.SetAttributeValue(irTestClassInstance, irAttribute, test_value);
+			// `Test Class Instance`.`Maximum Length` is now 20.0M
+
+			decimal test_addition = 5.0M;
+			decimal test_result = test_value + test_addition;
+
+			OmsMethodBuilder builder = new OmsMethodBuilder(Oms);
+			GetAttributeMethod ih_GA = builder.CreateGetAttributeMethod(irTestClass, "get", "Maximum Length", irAttribute);
+
+			CalculateNumericMethod ih_CN = builder.CreateCalculateNumericMethod(irTestClass, "build", "Test Attribute", AccessModifier.Public, true, Oms.GetInstance(KnownAttributeGuids.Numeric.Index), ih_GA, ArithmeticOperator.Add, test_addition);
+
+			OmsContext context = Oms.CreateContext();
+
+			// below is REQUIRED, else we get "cannot call non-static method without instance reference"
+			context.SetWorkData(irTestClass, irTestClassInstance);
+
+			InstanceHandle ih_test = Oms.Execute(context, ih_CN);
+			object value = context.GetWorkData(ih_test);
+
+			Assert.That(value, Is.EqualTo(test_result));
+		}
 	}
 
 }

mocha-dotnet/tests/Mocha.Core.Tests/MethodTests/GetAttributeMethodTests.cs

@@ -24,7 +24,7 @@ namespace Mocha.Core.Tests.MethodTests
 	{
 
 		[Test]
-		public void GetAttributeMethodTest()
+		public void GetInstanceAttributeMethodTest()
 		{
 			InstanceHandle irTestClass = Oms.GetInstance(TEST_CLASS_GUID);
 			InstanceHandle irTestClassInstance = Oms.CreateInstanceOf(irTestClass);
@@ -54,5 +54,36 @@ namespace Mocha.Core.Tests.MethodTests
 			Assert.That(testAttributeValue2, Is.EqualTo(testAttributeValue));
 		}
 
+
+		[Test]
+		public void GetStaticAttributeMethodTest()
+		{
+			InstanceHandle irTestClass = Oms.GetInstance(TEST_CLASS_GUID);
+			
+			InstanceHandle irTestAttribute = Oms.GetInstance(TEST_ATTR_GUID);
+			Assert.That(irTestAttribute, Is.Not.EqualTo(InstanceHandle.Empty));
+			Oms.AddAttribute(irTestClass, irTestAttribute);
+
+			Oms.SetAttributeValue(irTestClass, irTestAttribute, TEST_ATTR_VALUE);
+
+			string testAttributeValue = Oms.GetAttributeValue<string>(irTestClass, irTestAttribute);
+			Assert.That(testAttributeValue, Is.EqualTo(TEST_ATTR_VALUE));
+
+			// here, the test attribute has a particular value.
+			// let's make sure that calling a GA- Get Attribute method on TestClass returns the same
+			OmsMethodBuilder methodBuilder = new OmsMethodBuilder(Oms);
+
+			GetAttributeMethod gaMethod = methodBuilder.CreateGetAttributeMethod(irTestClass, "get", "Test Attribute", AccessModifier.Public, true, irTestAttribute);
+			// Method is: `Test Class@get Test Attribute(GA)*S`
+
+			ReturnAttributeMethodBinding gaMethodRamb = methodBuilder.CreateReturnAttributeMethodBinding(gaMethod);
+
+			OmsContext context = Oms.CreateContext();
+
+			object? testAttributeValue2 = Oms.ExecuteReturningAttributeValue(context, gaMethodRamb, null);
+			Assert.That(testAttributeValue2, Is.TypeOf<String>());
+			Assert.That(testAttributeValue2, Is.EqualTo(testAttributeValue));
+		}
+
 	}
 }