public override Expression BuildExpression(params ParameterExpression[] parameters)
{
if (parameters == null || parameters.Length != 1 || parameters[0].Type != typeof(T))
{
throw new RuleEngineException($"{nameof(BuildExpression)} must call with one parameter of {typeof(T)}");
}
var conditionalExpression = ConditionRule.BuildExpression(parameters);
if (!(conditionalExpression is LambdaExpression))
{
conditionalExpression = Expression.Lambda(conditionalExpression, parameters);
}
var trueExpression = TrueRule.BuildExpression(parameters);
if (!(trueExpression is LambdaExpression))
{
trueExpression = Expression.Lambda(trueExpression, parameters);
}
var falseExpression = FalseRule.BuildExpression(parameters);
if (!(falseExpression is LambdaExpression))
{
falseExpression = Expression.Lambda(falseExpression, parameters);
}
ExpressionForThisRule = Expression.Condition(Expression.Invoke(conditionalExpression, parameters.Cast <Expression>()),
Expression.Invoke(trueExpression, parameters.Cast <Expression>()),
Expression.Invoke(falseExpression, parameters.Cast <Expression>()));
return(ExpressionForThisRule);
}
public void Matches()
{
var rule = new TrueRule();
var result = rule.Matches(null, null);
Assert.AreEqual(true, result);
}
public void All_Remaining_Successors_Skip_Validation_When_First_Successor_Fails()
{
var rule1 = new TrueRule()
.IfValidThenValidate(new FalseRule1(), new FalseRule2(), new FalseRule3())
.Validate();
rule1.IsValid.ShouldBe(false);
rule1.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void Last_Successor_Validates_When_First_Successors_Pass()
{
var rule1 = new TrueRule()
.IfValidThenValidate(new TrueRule(), new TrueRule(), new FalseRule1())
.Validate();
rule1.IsValid.ShouldBe(false);
rule1.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void Last_Successors_In_Successor_Chain_Are_Skipped_When_First_Successors_Fail()
{
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule(), new FalseRule1())
.IfValidThenValidate(new FalseRule2(), new FalseRule3())
.Validate();
rule.IsValid.ShouldBe(false);
rule.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void GetValidationResults_IRule_Returns_One_Validation_Result()
{
var rule = new TrueRule().IfValidThenValidate
(
new TrueRule(), new FalseRule1(), new TrueRule()
);
rule.GetValidationResults().Count().ShouldBe(1);
}
public async Task GetValidationResultsAsync_IRule_Returns_One_Validation_Result()
{
var rule = new TrueRule().IfValidThenValidate
(
new TrueRule(), new FalseRule1(), new TrueRule()
);
var results = await rule.GetValidationResultsAsync();
results.Count().ShouldBe(1);
}
public async Task ValidateAsync_Of_T_IRule_Returns_One_Validation_Result()
{
var rule = new TrueRule().IfValidThenValidate
(
new TrueRule(), new FalseRule1(), new TrueRule()
);
var results = await rule.ValidateAsync <CustomValidationResult>();
results.Count().ShouldBe(1);
}
public void GetValidationResults_Of_T_IRule_Returns_One_Validation_Result()
{
var rule = new TrueRule().IfValidThenValidate
(
new TrueRule(), new FalseRule1(), new TrueRule()
);
var results = rule.GetValidationResults <CustomValidationResult>();
results.Count().ShouldBe(1);
results.First().ShouldBeOfType <CustomValidationResult>();
}
public override Expression BuildExpression(params ParameterExpression[] parameters)
{
if (parameters == null || parameters.Length != 1 || parameters[0].Type != typeof(T1))
{
throw new RuleEngineException($"{nameof(BuildExpression)} must call with one parameter of {typeof(T1)}");
}
var returnLabel = Expression.Label(typeof(T2), "returnLabel");
var conditionalExpression = ConditionRule.BuildExpression(parameters);
if (!(conditionalExpression is LambdaExpression))
{
conditionalExpression = Expression.Lambda(conditionalExpression, parameters);
}
var trueExpression = TrueRule.BuildExpression(parameters);
if (!(trueExpression is LambdaExpression))
{
trueExpression = Expression.Lambda(trueExpression, parameters);
}
var falseExpression = FalseRule.BuildExpression(parameters);
if (!(falseExpression is LambdaExpression))
{
falseExpression = Expression.Lambda(falseExpression, parameters);
}
var ifThenElseExpression = Expression.IfThenElse(
Expression.Invoke(conditionalExpression, parameters.Cast <Expression>()),
Expression.Return(returnLabel, Expression.Invoke(trueExpression, parameters.Cast <Expression>())),
Expression.Return(returnLabel, Expression.Invoke(falseExpression, parameters.Cast <Expression>()))
);
Debug.WriteLine($"ConditionRule:{Environment.NewLine}{ConditionRule.ExpressionDebugView()}");
Debug.WriteLine($"TrueRule:{Environment.NewLine}{TrueRule.ExpressionDebugView()}");
Debug.WriteLine($"FalseRule:{Environment.NewLine}{FalseRule.ExpressionDebugView()}");
var defaultForReturnLabel = Expression.Convert(Expression.Constant(default(T2)), typeof(T2));
ExpressionForThisRule = Expression.Block(ifThenElseExpression,
Expression.Label(returnLabel, defaultForReturnLabel));
return(ExpressionForThisRule);
}
public void Three_Rule_Chain_Executes_Successfully()
{
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule()
.IfValidThenValidate(new TrueRule())).Validate();
rule.IsValid.ShouldBe(true);
}
public void Valid_Parent_Fails_When_Successor_Fails_Validation()
{
var rule1 = new TrueRule().IfValidThenValidate(new FalseRule1()).Validate();
rule1.IsValid.ShouldBe(false);
rule1.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void Three_Rule_Chain_Fail_Skips_Third_In_Chain_When_Second_Fails()
{
var rule = new TrueRule()
.IfValidThenValidate(new FalseRule1()
.IfValidThenValidate(new FalseRule2())).Validate();
rule.IsValid.ShouldBe(false);
rule.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void Valid_Rule_Is_Valid_After_Validation()
{
var rule = new TrueRule().Validate();
rule.IsValid.ShouldBe(true);
}
public void Three_Rule_Chain_Hits_Third_In_Chain_And_Fails_Parent()
{
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule()
.IfValidThenValidate(new FalseRule1())).Validate();
rule.IsValid.ShouldBe(false);
rule.ErrorMessage.ShouldBe("FalseRule1 failed validation");
}
public void Parent_Fails_When_Last_Successor_In_Chains_Fails_Validation()
{
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule(), new TrueRule())
.IfValidThenValidate(new TrueRule(), new FalseRule3())
.Validate();
rule.IsValid.ShouldBe(false);
rule.ErrorMessage.ShouldBe("FalseRule3 failed validation");
}
public void Valid_Rule_Does_Not_Contain_An_Error_Message_After_Validation()
{
var rule = new TrueRule().Validate();
rule.ErrorMessage.ShouldBe(null);
}
public void Second_Invalid_Rule_In_Second_Successor_Chain_Should_Execute()
{
var output = string.Empty;
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule(), new TrueRule())
.IfValidThenValidate(new TrueRule(), new FalseRule3().IfInvalidThenExecute(r => output = "pass"))
.Validate();
output.ShouldBe("pass");
}
public void First_Valid_Rule_In_Second_Successor_Chain_Should_Execute_But_Third_False_Rule_Should_Not()
{
var output = string.Empty;
var output2 = string.Empty;
var rule = new TrueRule()
.IfValidThenValidate(new TrueRule().IfValidThenExecute(r => output = "pass"), new TrueRule())
.IfValidThenValidate(new FalseRule2().IfValidThenExecute(r => output2 = "pass"), new FalseRule3())
.Validate();
output.ShouldBe("pass");
output2.ShouldBe(string.Empty);
rule.ErrorMessage.ShouldBe("FalseRule2 failed validation");
}
