public bool FormulasAreTheSame(IFormula firstFormula, IFormula secondFormula)
{
if (firstFormula == null && secondFormula == null)
{
return(true);
}
if (firstFormula == null || secondFormula == null)
{
return(false);
}
var firstType = firstFormula.GetType();
var secondType = secondFormula.GetType();
if (firstType != secondType)
{
return(false);
}
//nothing more to check for distributed formula or black box formula
if (firstFormula.IsDistributed() || firstFormula.IsBlackBox() || firstFormula.IsDynamic())
{
return(true);
}
if (firstFormula.IsConstant())
{
var firstConstFormula = firstFormula.DowncastTo <ConstantFormula>();
var secondConstFormula = secondFormula.DowncastTo <ConstantFormula>();
return(firstConstFormula.Value == secondConstFormula.Value);
}
if (firstFormula.IsExplicit())
{
var firstExplicit = firstFormula.DowncastTo <ExplicitFormula>();
var secondExplicit = secondFormula.DowncastTo <ExplicitFormula>();
if (!string.Equals(firstExplicit.FormulaString, secondExplicit.FormulaString))
{
return(false);
}
//check that formula have the same references using the same alias
var firstObjectPathCache = new Cache <string, IFormulaUsablePath>(x => x.Alias);
firstObjectPathCache.AddRange(firstExplicit.ObjectPaths);
var secondObjectPathCache = new Cache <string, IFormulaUsablePath>(x => x.Alias);
secondObjectPathCache.AddRange(secondExplicit.ObjectPaths);
if (firstObjectPathCache.Count() != secondObjectPathCache.Count())
{
return(false);
}
foreach (var keyValue in firstObjectPathCache.KeyValues)
{
if (!secondObjectPathCache.Contains(keyValue.Key))
{
return(false);
}
var path = secondObjectPathCache[keyValue.Key];
if (!path.Equals(keyValue.Value))
{
return(false);
}
}
}
return(true);
}