/// <summary>
/// Checks if all properties in k1 are found in k2. If yes, k2 is useless.
/// </summary>
/// <param name="k1"></param>
/// <param name="k2"></param>
/// <returns></returns>
private static bool Subsumes(QVTRelations.IKey k1, QVTRelations.IKey k2)
{
if (k1.Part.Count <= k2.Part.Count && k1.PropertyPaths().Count <= k2.PropertyPaths().Count)
{
return(k1.Part.IsSubsetOf(k2.Part) &&
k1.PropertyPaths().All(k1PropertyPath => k2.PropertyPaths()
.Any(k2PropertyPath => AreEqual(k1PropertyPath, k2PropertyPath))));
}
return(false);
}
private static void MergeKeyInto(QVTRelations.IKey existingKey, QVTRelations.IKey keyToBeMergedInto)
{
foreach (EMOF.IProperty propertyToMerge in keyToBeMergedInto.Part)
{
if (!existingKey.Part.Contains(propertyToMerge))
{
existingKey.Part.Add(propertyToMerge);
}
}
foreach (PropertyPath propertyPathToMerge in keyToBeMergedInto.PropertyPaths())
{
if (existingKey.PropertyPaths().FirstOrDefault(pp => AreEqual(pp, propertyPathToMerge)) == null)
{
existingKey.PropertyPaths().Add(propertyPathToMerge);
}
}
}
private void FinishRelation(QVTRelations.RelationalTransformation transformation, EnAr.Element relationElement)
{
// We use the existing Relation object
QVTRelations.IRelation relation = FindRelation(transformation, relationElement.Name);
// We look for the tag "where"
string whereCode = explorer.GetTaggedValue(relationElement, "Where");
if (!string.IsNullOrWhiteSpace(whereCode))
{
relation.Where = ConstructWhenOrWherePattern(relation, whereCode);
}
// We look for the tag "when"
string whenCode = explorer.GetTaggedValue(relationElement, "When");
if (!string.IsNullOrWhiteSpace(whenCode))
{
relation.When = ConstructWhenOrWherePattern(relation, whenCode);
}
// We look for the tag 'qvtKey'
string qvtKeyString = explorer.GetTaggedValue(relationElement, "qvtKey");
if (!string.IsNullOrWhiteSpace(qvtKeyString))
{
relationsWithKeys.Add(relation);
ISet <EMOF.IClass> classes = FindAllClassesUsedInRelation(relation);
IList <QvtKeyParserResult> parsed = QvtKeyParser.Parse(qvtKeyString);
foreach (QvtKeyParserResult keyParserResult in parsed)
{
QVTRelations.IKey key = ConstructKey(classes, keyParserResult);
QVTRelations.IKey existingKey = relation.Keys().FirstOrDefault(k => k.Identifies == key.Identifies);
if (existingKey == null)
{
relation.Keys().Add(key);
}
else
{
MergeKeyInto(existingKey, key);
}
}
}
}
private QVTRelations.IRelationalTransformation ConstructRelationalTransformation(EnAr.Element transformationElement)
{
// We create a Transformation object
QVTRelations.RelationalTransformation transformation = new QVTRelations.RelationalTransformation
{
Name = transformationElement.Name,
};
// We first find the "Functions" class that contains the functions of the transformation
EnAr.Element functionsClass = explorer.GetChildrenElementsWithType(transformationElement, "class").FirstOrDefault(e => e.Stereotype.IsNullOrEmpty());
if (functionsClass != null)
{
// For each method, we create a Function in the QVT transforamtion
foreach (EnAr.Method method in functionsClass.Methods.OfType <EnAr.Method>())
{
ConstructFunction(transformation, method);
}
}
// We browse the children EA elements with the stereotype "qvtRelation"
IList <EnAr.Element> relationsElements = explorer.GetChildrenElementsWithTypeAndStereotype(transformationElement, "class", "qvtRelation");
// First pass: we create the basic relations (to manage relation calls later)
foreach (EnAr.Element relationElement in relationsElements)
{
ConstructBasicRelation(transformation, relationElement);
}
// Second pass, we finish the relations (with relation calls)
foreach (EnAr.Element relationElement in relationsElements)
{
FinishRelation(transformation, relationElement);
}
// We look for the tag 'qvtKey'
string qvtKeyString = explorer.GetTaggedValue(transformationElement, "qvtKey");
if (!string.IsNullOrWhiteSpace(qvtKeyString))
{
ISet <EMOF.IClass> classes = FindAllClassesUsedInTransformation(transformation);
IList <QvtKeyParserResult> parsed = QvtKeyParser.Parse(qvtKeyString);
foreach (QvtKeyParserResult keyParserResult in parsed)
{
QVTRelations.IKey key = ConstructKey(classes, keyParserResult);
QVTRelations.IKey existingKey = transformation.OwnedKey.FirstOrDefault(k => k.Identifies == key.Identifies);
if (existingKey == null)
{
transformation.OwnedKey.Add(key);
}
else
{
MergeKeyInto(existingKey, key);
}
}
}
// We check if some relation-level keys should not be removed because subsumed by global keys
foreach (QVTRelations.IRelation relationWithKeys in relationsWithKeys)
{
foreach (QVTRelations.IKey key in relationWithKeys.Keys().ToList())
{
QVTRelations.IKey superKey = transformation.OwnedKey.FirstOrDefault(k => Subsumes(k, key));
if (superKey != null)
{
relationWithKeys.Keys().Remove(key);
}
}
}
//TODO QVT Query Functions owned by the transformation?
return(transformation);
}