// requires: caseForOuterJoins corresponds the slot "slotNum"
// effects: Adds a WhenThen corresponding to child to caseForOuterJoins.
private void AddCaseForOuterJoins(CaseStatement caseForOuterJoins, CqlBlock child, int slotNum, CqlIdentifiers identifiers)
{
// Determine the cells that the slot comes from
// and make an OR expression, e.g., WHEN _from0 or _from2 or ... THEN child[slotNum]
ProjectedSlot childSlot = child.SlotValue(slotNum);
ConstantProjectedSlot constantSlot = childSlot as ConstantProjectedSlot;
if (constantSlot != null && constantSlot.CellConstant.IsNull())
{
// NULL being generated by a child - don't need to project
return;
}
BoolExpression originBool = BoolExpression.False;
for (int i = 0; i < NumBoolSlots; i++)
{
int boolSlotNum = BoolIndexToSlot(i);
if (child.IsProjected(boolSlotNum))
{
// OR it to the expression
QualifiedCellIdBoolean boolExpr = new QualifiedCellIdBoolean(child, identifiers, i);
originBool = BoolExpression.CreateOr(originBool, BoolExpression.CreateLiteral(boolExpr, RightDomainMap));
}
}
// Qualify the slotNum with the child.CqlAlias for the THEN
QualifiedSlot slot = child.QualifySlotWithBlockAlias(slotNum);
caseForOuterJoins.AddWhenThen(originBool, slot);
}
private SlotInfo[] CreateSlotInfosForCaseStatement(
bool[] parentRequiredSlots,
int foundSlot,
CqlBlock childBlock,
CaseStatement thisCaseStatement,
IEnumerable <WithRelationship> withRelationships)
{
int num = childBlock.Slots.Count - this.TotalSlots;
SlotInfo[] slotInfoArray = new SlotInfo[this.TotalSlots + num];
for (int slotNum = 0; slotNum < this.TotalSlots; ++slotNum)
{
bool isProjected = childBlock.IsProjected(slotNum);
bool parentRequiredSlot = parentRequiredSlots[slotNum];
ProjectedSlot slotValue = childBlock.SlotValue(slotNum);
MemberPath outputMemberPath = this.GetOutputMemberPath(slotNum);
if (slotNum == foundSlot)
{
slotValue = (ProjectedSlot) new CaseStatementProjectedSlot(thisCaseStatement.DeepQualify(childBlock), withRelationships);
isProjected = true;
}
else if (isProjected && parentRequiredSlot)
{
slotValue = (ProjectedSlot)childBlock.QualifySlotWithBlockAlias(slotNum);
}
SlotInfo slotInfo = new SlotInfo(parentRequiredSlot && isProjected, isProjected, slotValue, outputMemberPath);
slotInfoArray[slotNum] = slotInfo;
}
for (int totalSlots = this.TotalSlots; totalSlots < this.TotalSlots + num; ++totalSlots)
{
QualifiedSlot qualifiedSlot = childBlock.QualifySlotWithBlockAlias(totalSlots);
slotInfoArray[totalSlots] = new SlotInfo(true, true, (ProjectedSlot)qualifiedSlot, childBlock.MemberPath(totalSlots));
}
return(slotInfoArray);
}
private void AddCaseForOuterJoins(
CaseStatement caseForOuterJoins,
CqlBlock child,
int slotNum,
CqlIdentifiers identifiers)
{
ConstantProjectedSlot constantProjectedSlot = child.SlotValue(slotNum) as ConstantProjectedSlot;
if (constantProjectedSlot != null && constantProjectedSlot.CellConstant.IsNull())
{
return;
}
BoolExpression or = BoolExpression.False;
for (int index = 0; index < this.NumBoolSlots; ++index)
{
int slot = this.BoolIndexToSlot(index);
if (child.IsProjected(slot))
{
QualifiedCellIdBoolean qualifiedCellIdBoolean = new QualifiedCellIdBoolean(child, identifiers, index);
or = BoolExpression.CreateOr(or, BoolExpression.CreateLiteral((BoolLiteral)qualifiedCellIdBoolean, this.RightDomainMap));
}
}
QualifiedSlot qualifiedSlot = child.QualifySlotWithBlockAlias(slotNum);
caseForOuterJoins.AddWhenThen(or, (ProjectedSlot)qualifiedSlot);
}
private CqlBlock JoinToCqlBlock(
bool[] requiredSlots,
CqlIdentifiers identifiers,
ref int blockAliasNum,
ref List <WithRelationship> withRelationships)
{
int length1 = requiredSlots.Length;
List <CqlBlock> children = new List <CqlBlock>();
List <Tuple <QualifiedSlot, MemberPath> > tupleList = new List <Tuple <QualifiedSlot, MemberPath> >();
foreach (CellTreeNode child in this.Children)
{
bool[] projectedSlots = child.GetProjectedSlots();
OpCellTreeNode.AndWith(projectedSlots, requiredSlots);
CqlBlock cqlBlock = child.ToCqlBlock(projectedSlots, identifiers, ref blockAliasNum, ref withRelationships);
children.Add(cqlBlock);
for (int length2 = projectedSlots.Length; length2 < cqlBlock.Slots.Count; ++length2)
{
tupleList.Add(Tuple.Create <QualifiedSlot, MemberPath>(cqlBlock.QualifySlotWithBlockAlias(length2), cqlBlock.MemberPath(length2)));
}
}
SlotInfo[] slotInfos = new SlotInfo[length1 + tupleList.Count];
for (int slotNum = 0; slotNum < length1; ++slotNum)
{
SlotInfo joinSlotInfo = this.GetJoinSlotInfo(this.OpType, requiredSlots[slotNum], children, slotNum, identifiers);
slotInfos[slotNum] = joinSlotInfo;
}
int index1 = 0;
int index2 = length1;
while (index2 < length1 + tupleList.Count)
{
slotInfos[index2] = new SlotInfo(true, true, (ProjectedSlot)tupleList[index1].Item1, tupleList[index1].Item2);
++index2;
++index1;
}
List <JoinCqlBlock.OnClause> onClauses = new List <JoinCqlBlock.OnClause>();
for (int index3 = 1; index3 < children.Count; ++index3)
{
CqlBlock cqlBlock = children[index3];
JoinCqlBlock.OnClause onClause = new JoinCqlBlock.OnClause();
foreach (int keySlot in this.KeySlots)
{
if (!this.ViewgenContext.Config.IsValidationEnabled && (!cqlBlock.IsProjected(keySlot) || !children[0].IsProjected(keySlot)))
{
ErrorLog errorLog = new ErrorLog();
errorLog.AddEntry(new ErrorLog.Record(ViewGenErrorCode.NoJoinKeyOrFKProvidedInMapping, Strings.Viewgen_NoJoinKeyOrFK, (IEnumerable <LeftCellWrapper>) this.ViewgenContext.AllWrappersForExtent, string.Empty));
ExceptionHelpers.ThrowMappingException(errorLog, this.ViewgenContext.Config);
}
QualifiedSlot leftSlot = children[0].QualifySlotWithBlockAlias(keySlot);
QualifiedSlot rightSlot = cqlBlock.QualifySlotWithBlockAlias(keySlot);
MemberPath outputMember = slotInfos[keySlot].OutputMember;
onClause.Add(leftSlot, outputMember, rightSlot, outputMember);
}
onClauses.Add(onClause);
}
return((CqlBlock) new JoinCqlBlock(this.OpType, slotInfos, children, onClauses, identifiers, ++blockAliasNum));
}
/// <summary>
/// Given the slot (<paramref name="foundSlot"/>) and its corresponding case statement (<paramref name="thisCaseStatement"/>),
/// generates the slotinfos for the cql block producing the case statement.
/// </summary>
private SlotInfo[] CreateSlotInfosForCaseStatement(bool[] parentRequiredSlots,
int foundSlot,
CqlBlock childBlock,
CaseStatement thisCaseStatement,
IEnumerable <WithRelationship> withRelationships)
{
int numSlotsAddedByChildBlock = childBlock.Slots.Count - TotalSlots;
SlotInfo[] slotInfos = new SlotInfo[TotalSlots + numSlotsAddedByChildBlock];
for (int slotNum = 0; slotNum < TotalSlots; slotNum++)
{
bool isProjected = childBlock.IsProjected(slotNum);
bool isRequiredByParent = parentRequiredSlots[slotNum];
ProjectedSlot slot = childBlock.SlotValue(slotNum);
MemberPath outputMember = GetOutputMemberPath(slotNum);
if (slotNum == foundSlot)
{
// We need a case statement instead for this slot that we
// are handling right now
Debug.Assert(isRequiredByParent, "Case result not needed by parent");
// Get a case statement with all slots replaced by aliases slots
CaseStatement newCaseStatement = thisCaseStatement.DeepQualify(childBlock);
slot = new CaseStatementProjectedSlot(newCaseStatement, withRelationships);
isProjected = true; // We are projecting this slot now
}
else if (isProjected && isRequiredByParent)
{
// We only alias something that is needed and is being projected by the child.
// It is a qualified slot into the child block.
slot = childBlock.QualifySlotWithBlockAlias(slotNum);
}
// For slots, if it is not required by the parent, we want to
// set the isRequiredByParent for this slot to be
// false. Furthermore, we do not want to introduce any "NULL
// AS something" at this stage for slots not being
// projected. So if the child does not project that slot, we
// declare it as not being required by the parent (if such a
// NULL was needed, it would have been pushed all the way
// down to a non-case block.
// Essentially, from a Case statement's parent perspective,
// it is saying "If you can produce a slot either by yourself
// or your children, please do. Otherwise, do not concoct anything"
SlotInfo slotInfo = new SlotInfo(isRequiredByParent && isProjected, isProjected, slot, outputMember);
slotInfos[slotNum] = slotInfo;
}
for (int i = TotalSlots; i < TotalSlots + numSlotsAddedByChildBlock; i++)
{
QualifiedSlot childAddedSlot = childBlock.QualifySlotWithBlockAlias(i);
slotInfos[i] = new SlotInfo(true, true, childAddedSlot, childBlock.MemberPath(i));
}
return(slotInfos);
}
/// <summary>
/// Creates new <see cref="ProjectedSlot"/> that is qualified with <paramref name="block"/>.CqlAlias.
/// If current slot is composite (such as <see cref="CaseStatementProjectedSlot"/>, then this method recursively qualifies all parts
/// and returns a new deeply qualified slot (as opposed to <see cref="CqlBlock.QualifySlotWithBlockAlias"/>).
/// </summary>
internal virtual ProjectedSlot DeepQualify(CqlBlock block)
{
QualifiedSlot result = new QualifiedSlot(block, this);
return(result);
}
