public static PIMPath BuildPIMPath(PropertyCallExp node)
{
PIMPath path = new PIMPath();
OclExpression s;
if (node.ReferredProperty.Tag is PIMAssociationEnd)
{
s = node;
}
else
{
PIMAttribute a = (PIMAttribute)node.ReferredProperty.Tag;
PIMPathAttributeStep pathAttributeStep = new PIMPathAttributeStep {
Attribute = a
};
path.Steps.Add(pathAttributeStep);
s = node.Source;
}
while (!(s is VariableExp))
{
PIMPathAssociationStep step = new PIMPathAssociationStep();
step.AssociationEnd = (PIMAssociationEnd)((PropertyCallExp)s).ReferredProperty.Tag;
path.Steps.Insert(0, step);
s = ((PropertyCallExp)s).Source;
}
PIMPathVariableStep pathVariableStep = new PIMPathVariableStep();
pathVariableStep.VariableExp = (VariableExp)s;
path.Steps.Insert(0, pathVariableStep);
return(path);
}
private bool FindNavigationsForPIMNavigationRecursive(PIMPath pimPath, int stepIndex, PSMAssociationMember currentMember, PSMPath builtPath, bool canGoToParent, ref List <PSMPath> result, PSMAssociation associationUsedAlready)
{
if (stepIndex == pimPath.Steps.Count)
{
result.Add(builtPath);
return(true);
}
PIMPathStep currentStep = pimPath.Steps[stepIndex];
if (currentStep is PIMPathAssociationStep)
{
Debug.Assert(currentMember != null);
PIMPathAssociationStep nextStep = (PIMPathAssociationStep)currentStep;
List <PSMAssociationMember> candidates = currentMember.ChildPSMAssociations.Where(a => allowNonTree || !a.IsNonTreeAssociation).Select(a => a.Child).ToList();
/*
* we forbid non-tree associations for now,
* it certainly makes thinks easier and I am not sure
* whether it is really a restriction
*/
List <PSMAssociation> candidatesAssociations = currentMember.ChildPSMAssociations.Where(a => allowNonTree || !a.IsNonTreeAssociation).ToList();
PSMAssociationMember parent = currentMember.ParentAssociation != null ? currentMember.ParentAssociation.Parent : null;
if (parent != null && canGoToParent && !(parent is PSMSchemaClass))
{
bool candidateParent = true;
if (currentMember.ParentAssociation.Interpretation != null)
{
PIMAssociation interpretedAssociation = (PIMAssociation)currentMember.ParentAssociation.Interpretation;
PIMAssociationEnd interpretedEnd = currentMember.ParentAssociation.InterpretedAssociationEnd;
PIMAssociationEnd oppositeEnd = interpretedAssociation.PIMAssociationEnds.Single(e => e != interpretedEnd);
// upwards navigation on ends with upper cardinality > 1 breaks semantics of the expression
if (oppositeEnd.Upper > 1)
{
candidateParent = false;
}
}
if (candidateParent)
{
candidates.Add(parent);
candidatesAssociations.Add(currentMember.ParentAssociation);
}
}
bool found = false;
for (int index = 0; index < candidates.Count; index++)
{
PSMAssociationMember candidate = candidates[index];
PSMAssociation candidateAssociation = candidatesAssociations[index];
bool parentStep = candidate == parent && !candidateAssociation.IsNonTreeAssociation;
// forbid traversing the same association several times
if (associationUsedAlready == candidateAssociation)
{
continue;
}
int nextStepIndex = stepIndex;
bool interpretedClassSatisfies = candidateAssociation.Interpretation != null &&
candidate.DownCastSatisfies <PSMClass>(c => c.Interpretation == nextStep.Class);
if (candidate.Interpretation == null || interpretedClassSatisfies)
{
PSMPath nextBuiltPath = (PSMPath)builtPath.Clone();
nextBuiltPath.Steps.Add(new PSMPathAssociationStep(nextBuiltPath)
{
Association = candidateAssociation, To = candidate, From = currentMember,
IsUp = candidateAssociation.Parent == candidate
});
if (interpretedClassSatisfies)
{
nextStepIndex++;
}
found |= FindNavigationsForPIMNavigationRecursive(pimPath, nextStepIndex, candidate, nextBuiltPath,
canGoToParent && !parentStep, ref result, parentStep ? candidateAssociation : null);
}
}
return(found);
}
else if (currentStep is PIMPathVariableStep)
{
Debug.Assert(currentMember == null);
PIMPathVariableStep pathVariableStep = (PIMPathVariableStep)currentStep;
IEnumerable <PSMClass> candidates = TargetPSMSchema.PSMClasses.Where(c => c.Interpretation == pimPath.StartingClass);
if (!VariableClassMappings.ContainsKey(pathVariableStep.Variable))
{
return(false);
}
candidates = candidates.Intersect(VariableClassMappings[pathVariableStep.Variable]);
bool found = false;
List <PSMClass> eliminatedCandidates = new List <PSMClass>();
eliminatedCandidates.AddRange(VariableClassMappings[pathVariableStep.Variable].Except(candidates));
foreach (PSMClass candidate in candidates)
{
PSMBridgeClass startType = psmBridge.Find(candidate);
builtPath = new PSMPath();
VariableDeclaration vd;
if (!variableTranslations.ContainsKey(pathVariableStep.Variable))
{
vd = new VariableDeclaration(pathVariableStep.Variable.Name, startType, null);
variableTranslations[pathVariableStep.Variable] = vd;
}
else
{
vd = variableTranslations[pathVariableStep.Variable];
}
builtPath.Steps.Add(new PSMPathVariableStep(builtPath)
{
VariableExp = new VariableExp(vd)
});
bool candidateUsable = FindNavigationsForPIMNavigationRecursive(pimPath, stepIndex + 1, candidate, builtPath, true, ref result, null);
if (!candidateUsable)
{
eliminatedCandidates.Add(candidate);
}
found |= candidateUsable;
}
VariableClassMappings[pathVariableStep.Variable].RemoveAll(eliminatedCandidates.Contains);
if (PathMappings.ContainsKey(pimPath))
{
PathMappings[pimPath].RemoveAll(p => eliminatedCandidates.Contains(p.StartingClass));
}
return(found);
}
else if (currentStep is PIMPathAttributeStep)
{
PIMPathAttributeStep pathAttributeStep = (PIMPathAttributeStep)currentStep;
Debug.Assert(currentMember is PSMClass);
bool found = false;
foreach (PSMAttribute psmAttribute in ((PSMClass)currentMember).PSMAttributes)
{
if (psmAttribute.Interpretation == pathAttributeStep.Attribute)
{
PSMPath nextBuiltPath = (PSMPath)builtPath.Clone();
nextBuiltPath.Steps.Add(new PSMPathAttributeStep(nextBuiltPath)
{
Attribute = psmAttribute
});
result.Add(nextBuiltPath);
found |= true;
}
}
return(found);
}
else
{
throw new NotImplementedException();
}
}