// FIXME: This method should go completely.
// We changed the code to create the QCandidates graph in two steps:
// (1) call fitsIntoExistingConstraintHierarchy to determine whether
// or not we need more QCandidates objects
// (2) add all constraints
// This method tries to do both in one, which results in missing
// constraints. Not all are added to all QCandiates.
// Right methodology is in
// QQueryBase#createCandidateCollection
// and
// QQueryBase#createQCandidatesList
internal bool TryAddConstraint(QCon a_constraint)
{
if (_field != null)
{
QField qf = a_constraint.GetField();
if (qf != null)
{
if (_field.Name() != null && !_field.Name().Equals(qf.Name()))
{
return(false);
}
}
}
if (i_classMetadata == null || a_constraint.IsNullConstraint())
{
AddConstraint(a_constraint);
return(true);
}
ClassMetadata yc = a_constraint.GetYapClass();
if (yc != null)
{
yc = i_classMetadata.GetHigherOrCommonHierarchy(yc);
if (yc != null)
{
i_classMetadata = yc;
AddConstraint(a_constraint);
return(true);
}
}
AddConstraint(a_constraint);
return(false);
}
public bool FitsIntoExistingConstraintHierarchy(QCon constraint)
{
if (_field != null)
{
QField qf = constraint.GetField();
if (qf != null)
{
if (_field.Name() != null && !_field.Name().Equals(qf.Name()))
{
return(false);
}
}
}
if (i_classMetadata == null || constraint.IsNullConstraint())
{
return(true);
}
ClassMetadata classMetadata = constraint.GetYapClass();
if (classMetadata == null)
{
return(false);
}
classMetadata = i_classMetadata.GetHigherOrCommonHierarchy(classMetadata);
if (classMetadata == null)
{
return(false);
}
i_classMetadata = classMetadata;
return(true);
}
private bool CreateChildForDescendable(QCandidates parentCandidates, ITypeHandler4
handler, QueryingReadContext queryingReadContext, ITypeHandler4 arrayElementHandler
)
{
int offset = queryingReadContext.Offset();
bool outerRes = true;
// The following construct is worse than not ideal. For each constraint it completely reads the
// underlying structure again. The structure could be kept fairly easy. TODO: Optimize!
IEnumerator i = parentCandidates.IterateConstraints();
while (i.MoveNext())
{
QCon qcon = (QCon)i.Current;
QField qf = qcon.GetField();
if (qf != null && !qf.Name().Equals(_fieldMetadata.GetName()))
{
continue;
}
QCon tempParent = qcon.Parent();
qcon.SetParent(null);
QCandidates candidates = new QCandidates(parentCandidates.i_trans, null, qf, false
);
candidates.AddConstraint(qcon);
qcon.SetCandidates(candidates);
ReadArrayCandidates(handler, queryingReadContext.Buffer(), arrayElementHandler, candidates
);
queryingReadContext.Seek(offset);
bool isNot = qcon.IsNot();
if (isNot)
{
qcon.RemoveNot();
}
candidates.Evaluate();
ByRef pending = ByRef.NewInstance();
BooleanByRef innerRes = new BooleanByRef(isNot);
candidates.Traverse(new QCandidate.CreateDescendChildTraversingVisitor(pending, innerRes
, isNot));
if (isNot)
{
qcon.Not();
}
// In case we had pending subresults, we need to communicate them up to our root.
if (((Tree)pending.value) != null)
{
((Tree)pending.value).Traverse(new _IVisitor4_168(this));
}
if (!innerRes.value)
{
// Again this could be double triggering.
//
// We want to clean up the "No route" at some stage.
qcon.Visit(GetRoot(), qcon.Evaluator().Not(false));
outerRes = false;
}
qcon.SetParent(tempParent);
}
return(outerRes);
}
private FieldMetadata FieldMetadataFrom(QField qField, Db4objects.Db4o.Internal.ClassMetadata
type)
{
FieldMetadata existingField = qField.GetFieldMetadata();
if (existingField != null)
{
return existingField;
}
FieldMetadata field = type.FieldMetadataForName(qField.Name());
if (field != null)
{
field.Alive();
}
return field;
}
// Our QConPath objects are just placeholders to fields,
// so the parents are reachable.
// If we find a "real" constraint, we throw the QPath
// out and replace it with the other constraint.
private void Morph(BooleanByRef removeExisting, QCon newConstraint, IReflectClass
claxx)
{
bool mayMorph = true;
if (claxx != null)
{
ClassMetadata yc = i_trans.Container().ProduceClassMetadata(claxx);
if (yc != null)
{
IEnumerator i = IterateChildren();
while (i.MoveNext())
{
QField qf = ((QCon)i.Current).GetField();
if (!yc.HasField(i_trans.Container(), qf.Name()))
{
mayMorph = false;
break;
}
}
}
}
// }
if (mayMorph)
{
IEnumerator j = IterateChildren();
while (j.MoveNext())
{
newConstraint.AddConstraint((QCon)j.Current);
}
if (HasJoins())
{
IEnumerator k = IterateJoins();
while (k.MoveNext())
{
QConJoin qcj = (QConJoin)k.Current;
qcj.ExchangeConstraint(this, newConstraint);
newConstraint.AddJoin(qcj);
}
}
i_parent.ExchangeConstraint(this, newConstraint);
removeExisting.value = true;
}
else
{
i_parent.AddConstraint(newConstraint);
}
}
private FieldMetadata FieldMetadataFrom(QField qField, ClassMetadata
type)
{
var existingField = qField.GetFieldMetadata();
if (existingField != null)
{
return(existingField);
}
var field = type.FieldMetadataForName(qField.Name());
if (field != null)
{
field.Alive();
}
return(field);
}
private FieldMetadata FieldMetadataFrom(QField qField, ClassMetadata
type)
{
var existingField = qField.GetFieldMetadata();
if (existingField != null)
{
return existingField;
}
var field = type.FieldMetadataForName(qField.Name());
if (field != null)
{
field.Alive();
}
return field;
}
internal virtual bool CreateChild(QCandidates a_candidates)
{
if (!_include)
{
return(false);
}
if (_fieldMetadata != null)
{
ITypeHandler4 handler = _fieldMetadata.GetHandler();
if (handler != null)
{
QueryingReadContext queryingReadContext = new QueryingReadContext(Transaction(),
MarshallerFamily().HandlerVersion(), _bytes, _key);
ITypeHandler4 arrayElementHandler = Handlers4.ArrayElementHandler(handler, queryingReadContext
);
if (arrayElementHandler != null)
{
int offset = queryingReadContext.Offset();
bool outerRes = true;
// The following construct is worse than not ideal.
// For each constraint it completely reads the
// underlying structure again. The structure could b
// kept fairly easy. TODO: Optimize!
IEnumerator i = a_candidates.IterateConstraints();
while (i.MoveNext())
{
QCon qcon = (QCon)i.Current;
QField qf = qcon.GetField();
if (qf == null || qf.Name().Equals(_fieldMetadata.GetName()))
{
QCon tempParent = qcon.Parent();
qcon.SetParent(null);
QCandidates candidates = new QCandidates(a_candidates.i_trans, null, qf);
candidates.AddConstraint(qcon);
qcon.SetCandidates(candidates);
ReadArrayCandidates(handler, queryingReadContext.Buffer(), arrayElementHandler, candidates
);
queryingReadContext.Seek(offset);
bool isNot = qcon.IsNot();
if (isNot)
{
qcon.RemoveNot();
}
candidates.Evaluate();
ByRef pending = ByRef.NewInstance();
bool[] innerRes = new bool[] { isNot };
candidates.Traverse(new _IVisitor4_160(innerRes, isNot, pending));
// Collect all pending subresults.
// We need to change
// the
// constraint here, so
// our
// pending collector
// uses
// the right
// comparator.
// We only keep one
// pending result
// for
// all array
// elements.
// and memorize,
// whether we had a
// true or a false
// result.
// or both.
if (isNot)
{
qcon.Not();
}
// In case we had pending subresults, we
// need to communicate
// them up to our root.
if (((Tree)pending.value) != null)
{
((Tree)pending.value).Traverse(new _IVisitor4_229(this));
}
if (!innerRes[0])
{
// Again this could be double triggering.
//
// We want to clean up the "No route"
// at some stage.
qcon.Visit(GetRoot(), qcon.Evaluator().Not(false));
outerRes = false;
}
qcon.SetParent(tempParent);
}
}
return(outerRes);
}
// We may get simple types here too, if the YapField was null
// in the higher level simple evaluation. Evaluate these
// immediately.
if (Handlers4.IsQueryLeaf(handler))
{
a_candidates.i_currentConstraint.Visit(this);
return(true);
}
}
}
if (_fieldMetadata == null)
{
return(false);
}
if (_fieldMetadata is NullFieldMetadata)
{
return(false);
}
_classMetadata.SeekToField(Transaction(), _bytes, _fieldMetadata);
Db4objects.Db4o.Internal.Query.Processor.QCandidate candidate = ReadSubCandidate(
a_candidates);
if (candidate == null)
{
return(false);
}
// fast early check for ClassMetadata
if (a_candidates.i_classMetadata != null && a_candidates.i_classMetadata.IsStronglyTyped
())
{
ITypeHandler4 handler = _fieldMetadata.GetHandler();
if (Handlers4.IsUntyped(handler))
{
handler = TypeHandlerFor(candidate);
}
if (handler == null)
{
return(false);
}
}
AddDependant(a_candidates.Add(candidate));
return(true);
}
private FieldMetadata FieldMetadataFrom(QField qField, Db4objects.Db4o.Internal.ClassMetadata
type)
{
FieldMetadata existingField = qField.GetFieldMetadata();
if (existingField != null)
{
return existingField;
}
FieldMetadata field = type.FieldMetadataForName(qField.Name());
if (field != null)
{
field.Alive();
}
return field;
}
