// <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)
{
var numSlotsAddedByChildBlock = childBlock.Slots.Count - TotalSlots;
var slotInfos = new SlotInfo[TotalSlots + numSlotsAddedByChildBlock];
for (var slotNum = 0; slotNum < TotalSlots; slotNum++)
{
var isProjected = childBlock.IsProjected(slotNum);
var isRequiredByParent = parentRequiredSlots[slotNum];
var slot = childBlock.SlotValue(slotNum);
var 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
var 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"
var slotInfo = new SlotInfo(isRequiredByParent && isProjected, isProjected, slot, outputMember);
slotInfos[slotNum] = slotInfo;
}
for (var i = TotalSlots; i < TotalSlots + numSlotsAddedByChildBlock; i++)
{
var childAddedSlot = childBlock.QualifySlotWithBlockAlias(i);
slotInfos[i] = new SlotInfo(true, true, childAddedSlot, childBlock.MemberPath(i));
}
return(slotInfos);
}
// requires: node corresponds to an IJ, LOJ, FOJ node
// effects: Given a union node and the slots required by the parent,
// generates a CqlBlock for the subtree rooted at node
private CqlBlock JoinToCqlBlock(bool[] requiredSlots, CqlIdentifiers identifiers, ref int blockAliasNum, ref List <WithRelationship> withRelationships)
{
int totalSlots = requiredSlots.Length;
Debug.Assert(OpType == CellTreeOpType.IJ ||
OpType == CellTreeOpType.LOJ ||
OpType == CellTreeOpType.FOJ, "Only these join operations handled");
List <CqlBlock> children = new List <CqlBlock>();
List <Tuple <QualifiedSlot, MemberPath> > additionalChildSlots = new List <Tuple <QualifiedSlot, MemberPath> >();
// First get the children nodes (FROM part)
foreach (CellTreeNode child in Children)
{
// Determine the slots that are projected by this child.
// These are the required slots as well - unlike Union, we do not need the child to project any extra nulls.
bool[] childProjectedSlots = child.GetProjectedSlots();
AndWith(childProjectedSlots, requiredSlots);
CqlBlock childBlock = child.ToCqlBlock(childProjectedSlots, identifiers, ref blockAliasNum, ref withRelationships);
children.Add(childBlock);
for (int qualifiedSlotNumber = childProjectedSlots.Length; qualifiedSlotNumber < childBlock.Slots.Count; qualifiedSlotNumber++)
{
additionalChildSlots.Add(Tuple.Create(childBlock.QualifySlotWithBlockAlias(qualifiedSlotNumber), childBlock.MemberPath(qualifiedSlotNumber)));
}
Debug.Assert(totalSlots == child.NumBoolSlots + child.NumProjectedSlots,
"Number of required slots is different from what each node in the tree has?");
}
// Now get the slots that are projected out by this node (SELECT part)
SlotInfo[] slotInfos = new SlotInfo[totalSlots + additionalChildSlots.Count];
for (int slotNum = 0; slotNum < totalSlots; slotNum++)
{
// Note: this call could create a CaseStatementSlot (i.e., slotInfo.SlotValue is CaseStatementSlot)
// which uses "from" booleans that need to be projected by children
SlotInfo slotInfo = GetJoinSlotInfo(OpType, requiredSlots[slotNum], children, slotNum, identifiers);
slotInfos[slotNum] = slotInfo;
}
for (int i = 0, slotNum = totalSlots; slotNum < totalSlots + additionalChildSlots.Count; slotNum++, i++)
{
slotInfos[slotNum] = new SlotInfo(true, true, additionalChildSlots[i].Item1, additionalChildSlots[i].Item2);
}
// Generate the ON conditions: For each child, generate an ON
// clause with the 0th child on the key fields
List <JoinCqlBlock.OnClause> onClauses = new List <JoinCqlBlock.OnClause>();
for (int i = 1; i < children.Count; i++)
{
CqlBlock child = children[i];
JoinCqlBlock.OnClause onClause = new JoinCqlBlock.OnClause();
foreach (int keySlotNum in this.KeySlots)
{
if (ViewgenContext.Config.IsValidationEnabled)
{
Debug.Assert(children[0].IsProjected(keySlotNum), "Key is not in 0th child");
Debug.Assert(child.IsProjected(keySlotNum), "Key is not in child");
}
else
{
if (!child.IsProjected(keySlotNum) || !children[0].IsProjected(keySlotNum))
{
ErrorLog errorLog = new ErrorLog();
errorLog.AddEntry(new ErrorLog.Record(true, ViewGenErrorCode.NoJoinKeyOrFKProvidedInMapping,
Strings.Viewgen_NoJoinKeyOrFK, ViewgenContext.AllWrappersForExtent, String.Empty));
ExceptionHelpers.ThrowMappingException(errorLog, ViewgenContext.Config);
}
}
var firstSlot = children[0].QualifySlotWithBlockAlias(keySlotNum);
var secondSlot = child.QualifySlotWithBlockAlias(keySlotNum);
var outputMember = slotInfos[keySlotNum].OutputMember;
onClause.Add(firstSlot, outputMember, secondSlot, outputMember);
}
onClauses.Add(onClause);
}
CqlBlock result = new JoinCqlBlock(OpType, slotInfos, children, onClauses, identifiers, ++blockAliasNum);
return(result);
}
// requires: node corresponds to a Union node
// effects: Given a union node and the slots required by the parent,
// generates a CqlBlock for the subtree rooted at node
private CqlBlock UnionToCqlBlock(bool[] requiredSlots, CqlIdentifiers identifiers, ref int blockAliasNum, ref List <WithRelationship> withRelationships)
{
Debug.Assert(OpType == CellTreeOpType.Union);
List <CqlBlock> children = new List <CqlBlock>();
List <Tuple <CqlBlock, SlotInfo> > additionalChildSlots = new List <Tuple <CqlBlock, SlotInfo> >();
int totalSlots = requiredSlots.Length;
foreach (CellTreeNode child in Children)
{
// Unlike Join, we pass the requiredSlots from the parent as the requirement.
bool[] childProjectedSlots = child.GetProjectedSlots();
AndWith(childProjectedSlots, requiredSlots);
CqlBlock childBlock = child.ToCqlBlock(childProjectedSlots, identifiers, ref blockAliasNum, ref withRelationships);
for (int qualifiedSlotNumber = childProjectedSlots.Length; qualifiedSlotNumber < childBlock.Slots.Count; qualifiedSlotNumber++)
{
additionalChildSlots.Add(Tuple.Create(childBlock, childBlock.Slots[qualifiedSlotNumber]));
}
// if required, but not projected, add NULL
SlotInfo[] paddedSlotInfo = new SlotInfo[childBlock.Slots.Count];
for (int slotNum = 0; slotNum < totalSlots; slotNum++)
{
if (requiredSlots[slotNum] && !childProjectedSlots[slotNum])
{
if (IsBoolSlot(slotNum))
{
paddedSlotInfo[slotNum] = new SlotInfo(true /* is required */, true /* is projected */,
new BooleanProjectedSlot(BoolExpression.False, identifiers, SlotToBoolIndex(slotNum)), null /* member path*/);
}
else
{
// NULL as projected slot
MemberPath memberPath = childBlock.MemberPath(slotNum);
paddedSlotInfo[slotNum] = new SlotInfo(true /* is required */, true /* is projected */,
new ConstantProjectedSlot(Constant.Null, memberPath), memberPath);
}
}
else
{
paddedSlotInfo[slotNum] = childBlock.Slots[slotNum];
}
}
childBlock.Slots = new ReadOnlyCollection <SlotInfo>(paddedSlotInfo);
children.Add(childBlock);
Debug.Assert(totalSlots == child.NumBoolSlots + child.NumProjectedSlots,
"Number of required slots is different from what each node in the tree has?");
}
// We need to add the slots added by each child uniformly for others (as nulls) since this is a union operation.
if (additionalChildSlots.Count != 0)
{
foreach (CqlBlock childBlock in children)
{
SlotInfo[] childSlots = new SlotInfo[totalSlots + additionalChildSlots.Count];
childBlock.Slots.CopyTo(childSlots, 0);
int index = totalSlots;
foreach (var addtionalChildSlotInfo in additionalChildSlots)
{
var slotInfo = addtionalChildSlotInfo.Item2;
if (addtionalChildSlotInfo.Item1.Equals(childBlock))
{
childSlots[index] = new SlotInfo(true /* is required */, true /* is projected */, slotInfo.SlotValue, slotInfo.OutputMember);
}
else
{
childSlots[index] = new SlotInfo(true /* is required */, true /* is projected */,
new ConstantProjectedSlot(Constant.Null, slotInfo.OutputMember), slotInfo.OutputMember);
}
//move on to the next slot added by children.
index++;
}
childBlock.Slots = new ReadOnlyCollection <SlotInfo>(childSlots);
}
}
// Create the slotInfos and then Union CqlBlock
SlotInfo[] slotInfos = new SlotInfo[totalSlots + additionalChildSlots.Count];
// We pick the slot references from the first child, just as convention
// In a union, values come from both sides
CqlBlock firstChild = children[0];
for (int slotNum = 0; slotNum < totalSlots; slotNum++)
{
SlotInfo slotInfo = firstChild.Slots[slotNum];
// A required slot is somehow projected by a child in Union, so set isProjected to be the same as isRequired.
bool isRequired = requiredSlots[slotNum];
slotInfos[slotNum] = new SlotInfo(isRequired, isRequired, slotInfo.SlotValue, slotInfo.OutputMember);
}
for (int slotNum = totalSlots; slotNum < totalSlots + additionalChildSlots.Count; slotNum++)
{
var aslot = firstChild.Slots[slotNum];
slotInfos[slotNum] = new SlotInfo(true, true, aslot.SlotValue, aslot.OutputMember);
}
CqlBlock block = new UnionCqlBlock(slotInfos, children, identifiers, ++blockAliasNum);
return(block);
}
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 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));
}
private CqlBlock UnionToCqlBlock(
bool[] requiredSlots,
CqlIdentifiers identifiers,
ref int blockAliasNum,
ref List <WithRelationship> withRelationships)
{
List <CqlBlock> children = new List <CqlBlock>();
List <Tuple <CqlBlock, SlotInfo> > tupleList = new List <Tuple <CqlBlock, SlotInfo> >();
int length1 = requiredSlots.Length;
foreach (CellTreeNode child in this.Children)
{
bool[] projectedSlots = child.GetProjectedSlots();
OpCellTreeNode.AndWith(projectedSlots, requiredSlots);
CqlBlock cqlBlock = child.ToCqlBlock(projectedSlots, identifiers, ref blockAliasNum, ref withRelationships);
for (int length2 = projectedSlots.Length; length2 < cqlBlock.Slots.Count; ++length2)
{
tupleList.Add(Tuple.Create <CqlBlock, SlotInfo>(cqlBlock, cqlBlock.Slots[length2]));
}
SlotInfo[] slotInfoArray = new SlotInfo[cqlBlock.Slots.Count];
for (int slotNum = 0; slotNum < length1; ++slotNum)
{
if (requiredSlots[slotNum] && !projectedSlots[slotNum])
{
if (this.IsBoolSlot(slotNum))
{
slotInfoArray[slotNum] = new SlotInfo(true, true, (ProjectedSlot) new BooleanProjectedSlot(BoolExpression.False, identifiers, this.SlotToBoolIndex(slotNum)), (MemberPath)null);
}
else
{
MemberPath outputMember = cqlBlock.MemberPath(slotNum);
slotInfoArray[slotNum] = new SlotInfo(true, true, (ProjectedSlot) new ConstantProjectedSlot(Constant.Null), outputMember);
}
}
else
{
slotInfoArray[slotNum] = cqlBlock.Slots[slotNum];
}
}
cqlBlock.Slots = new ReadOnlyCollection <SlotInfo>((IList <SlotInfo>)slotInfoArray);
children.Add(cqlBlock);
}
if (tupleList.Count != 0)
{
foreach (CqlBlock cqlBlock in children)
{
SlotInfo[] array = new SlotInfo[length1 + tupleList.Count];
cqlBlock.Slots.CopyTo(array, 0);
int index = length1;
foreach (Tuple <CqlBlock, SlotInfo> tuple in tupleList)
{
SlotInfo slotInfo = tuple.Item2;
array[index] = !tuple.Item1.Equals((object)cqlBlock) ? new SlotInfo(true, true, (ProjectedSlot) new ConstantProjectedSlot(Constant.Null), slotInfo.OutputMember) : new SlotInfo(true, true, slotInfo.SlotValue, slotInfo.OutputMember);
++index;
}
cqlBlock.Slots = new ReadOnlyCollection <SlotInfo>((IList <SlotInfo>)array);
}
}
SlotInfo[] slotInfos = new SlotInfo[length1 + tupleList.Count];
CqlBlock cqlBlock1 = children[0];
for (int index = 0; index < length1; ++index)
{
SlotInfo slot = cqlBlock1.Slots[index];
bool requiredSlot = requiredSlots[index];
slotInfos[index] = new SlotInfo(requiredSlot, requiredSlot, slot.SlotValue, slot.OutputMember);
}
for (int index = length1; index < length1 + tupleList.Count; ++index)
{
SlotInfo slot = cqlBlock1.Slots[index];
slotInfos[index] = new SlotInfo(true, true, slot.SlotValue, slot.OutputMember);
}
return((CqlBlock) new UnionCqlBlock(slotInfos, children, identifiers, ++blockAliasNum));
}
