// effects: Align the fields of each cell in mapping using projectedSlotMap that has a mapping
// for each member of this extent to the slot number of that member in the projected slots
// example:
// input: Proj[A,B,"5"] = Proj[F,"7",G]
// Proj[C,B] = Proj[H,I]
// output: m_projectedSlotMap: A -> 0, B -> 1, C -> 2
// Proj[A,B,null] = Proj[F,"7",null]
// Proj[null,B,C] = Proj[null,I,H]
private static List <Cell> AlignFields(
IEnumerable <Cell> cells, MemberProjectionIndex projectedSlotMap,
ViewTarget viewTarget)
{
var outputCells = new List <Cell>();
// Determine the aligned field for each cell
// The new cells have ProjectedSlotMap.Count number of fields
foreach (var cell in cells)
{
// If isQueryView is true, we need to consider the C side of
// the cells; otherwise, we look at the S side. Note that we
// CANNOT use cell.LeftQuery since that is determined by
// cell's isQueryView
// The query for which we are constructing the extent
var mainQuery = cell.GetLeftQuery(viewTarget);
var otherQuery = cell.GetRightQuery(viewTarget);
CellQuery newMainQuery;
CellQuery newOtherQuery;
// Create both queries where the projected slot map is used
// to determine the order of the fields of the mainquery (of
// course, the otherQuery's fields are aligned automatically)
mainQuery.CreateFieldAlignedCellQueries(
otherQuery, projectedSlotMap,
out newMainQuery, out newOtherQuery);
var outputCell = viewTarget == ViewTarget.QueryView
? Cell.CreateCS(newMainQuery, newOtherQuery, cell.CellLabel, cell.CellNumber)
: Cell.CreateCS(newOtherQuery, newMainQuery, cell.CellLabel, cell.CellNumber);
outputCells.Add(outputCell);
}
return(outputCells);
}
internal MemberMaps(
ViewTarget viewTarget,
MemberProjectionIndex projectedSlotMap,
MemberDomainMap queryDomainMap,
MemberDomainMap updateDomainMap)
{
this.m_projectedSlotMap = projectedSlotMap;
this.m_queryDomainMap = queryDomainMap;
this.m_updateDomainMap = updateDomainMap;
this.m_viewTarget = viewTarget;
}
// effects: Creates a view generator object that can be used to generate views
// based on usedCells (projectedSlotMap are useful for deciphering the fields)
internal BasicViewGenerator(MemberProjectionIndex projectedSlotMap, List <LeftCellWrapper> usedCells, FragmentQuery activeDomain,
ViewgenContext context, MemberDomainMap domainMap, ErrorLog errorLog, ConfigViewGenerator config)
{
Debug.Assert(usedCells.Count > 0, "No used cells");
m_projectedSlotMap = projectedSlotMap;
m_usedCells = usedCells;
m_viewgenContext = context;
m_activeDomain = activeDomain;
m_errorLog = errorLog;
m_config = config;
m_domainMap = domainMap;
}
internal ViewgenContext(
ViewTarget viewTarget,
EntitySetBase extent,
IList <Cell> extentCells,
CqlIdentifiers identifiers,
ConfigViewGenerator config,
MemberDomainMap queryDomainMap,
MemberDomainMap updateDomainMap,
EntityContainerMapping entityContainerMapping)
{
foreach (Cell extentCell in (IEnumerable <Cell>)extentCells)
{
;
}
this.m_extent = extent;
this.m_viewTarget = viewTarget;
this.m_config = config;
this.m_edmItemCollection = entityContainerMapping.StorageMappingItemCollection.EdmItemCollection;
this.m_entityContainerMapping = entityContainerMapping;
this.m_identifiers = identifiers;
updateDomainMap = updateDomainMap.MakeCopy();
MemberDomainMap domainMap = viewTarget == ViewTarget.QueryView ? queryDomainMap : updateDomainMap;
this.m_memberMaps = new MemberMaps(viewTarget, MemberProjectionIndex.Create(extent, this.m_edmItemCollection), queryDomainMap, updateDomainMap);
FragmentQueryKBChaseSupport kb1 = new FragmentQueryKBChaseSupport();
kb1.CreateVariableConstraints(extent, domainMap, this.m_edmItemCollection);
this.m_leftFragmentQP = new FragmentQueryProcessor(kb1);
this.m_rewritingCache = new Dictionary <FragmentQuery, Tile <FragmentQuery> >(FragmentQuery.GetEqualityComparer(this.m_leftFragmentQP));
if (!this.CreateLeftCellWrappers(extentCells, viewTarget))
{
return;
}
FragmentQueryKBChaseSupport kb2 = new FragmentQueryKBChaseSupport();
MemberDomainMap memberDomainMap = viewTarget == ViewTarget.QueryView ? updateDomainMap : queryDomainMap;
foreach (LeftCellWrapper cellWrapper in this.m_cellWrappers)
{
EntitySetBase rightExtent = cellWrapper.RightExtent;
kb2.CreateVariableConstraints(rightExtent, memberDomainMap, this.m_edmItemCollection);
kb2.CreateAssociationConstraints(rightExtent, memberDomainMap, this.m_edmItemCollection);
}
if (this.m_viewTarget == ViewTarget.UpdateView)
{
this.CreateConstraintsForForeignKeyAssociationsAffectingThisWrapper((FragmentQueryKB)kb2, memberDomainMap);
}
this.m_rightFragmentQP = new FragmentQueryProcessor(kb2);
if (this.m_viewTarget == ViewTarget.QueryView)
{
this.CheckConcurrencyControlTokens();
}
this.m_cellWrappers.Sort(LeftCellWrapper.Comparer);
}
/// <summary>
/// Given the generated <paramref name="view"/>, the <paramref name="caseStatements"/> for the multiconstant fields,
/// the <paramref name="projectedSlotMap"/> that maps different paths of the entityset (for which the view is being generated) to slot indexes in the view,
/// creates an object that is capable of generating the Cql for <paramref name="view"/>.
/// </summary>
internal CqlGenerator(CellTreeNode view,
Dictionary <MemberPath,
CaseStatement> caseStatements,
CqlIdentifiers identifiers,
MemberProjectionIndex projectedSlotMap,
int numCellsInView,
BoolExpression topLevelWhereClause,
StorageMappingItemCollection mappingItemCollection)
{
m_view = view;
m_caseStatements = caseStatements;
m_projectedSlotMap = projectedSlotMap;
m_numBools = numCellsInView; // We have that many booleans
m_topLevelWhereClause = topLevelWhereClause;
m_identifiers = identifiers;
m_mappingItemCollection = mappingItemCollection;
}
private static List <Cell> AlignFields(
IEnumerable <Cell> cells,
MemberProjectionIndex projectedSlotMap,
ViewTarget viewTarget)
{
List <Cell> cellList = new List <Cell>();
foreach (Cell cell1 in cells)
{
CellQuery newMainQuery;
CellQuery newOtherQuery;
cell1.GetLeftQuery(viewTarget).CreateFieldAlignedCellQueries(cell1.GetRightQuery(viewTarget), projectedSlotMap, out newMainQuery, out newOtherQuery);
Cell cell2 = viewTarget == ViewTarget.QueryView ? Cell.CreateCS(newMainQuery, newOtherQuery, cell1.CellLabel, cell1.CellNumber) : Cell.CreateCS(newOtherQuery, newMainQuery, cell1.CellLabel, cell1.CellNumber);
cellList.Add(cell2);
}
return(cellList);
}
internal BasicViewGenerator(
MemberProjectionIndex projectedSlotMap,
List <LeftCellWrapper> usedCells,
FragmentQuery activeDomain,
ViewgenContext context,
MemberDomainMap domainMap,
ErrorLog errorLog,
ConfigViewGenerator config)
{
this.m_projectedSlotMap = projectedSlotMap;
this.m_usedCells = usedCells;
this.m_viewgenContext = context;
this.m_activeDomain = activeDomain;
this.m_errorLog = errorLog;
this.m_config = config;
this.m_domainMap = domainMap;
}
internal ViewgenContext(
ViewTarget viewTarget, EntitySetBase extent, IList <Cell> extentCells,
CqlIdentifiers identifiers, ConfigViewGenerator config, MemberDomainMap queryDomainMap,
MemberDomainMap updateDomainMap, StorageEntityContainerMapping entityContainerMapping)
{
foreach (var cell in extentCells)
{
Debug.Assert(extent.Equals(cell.GetLeftQuery(viewTarget).Extent));
Debug.Assert(cell.CQuery.NumProjectedSlots == cell.SQuery.NumProjectedSlots);
}
m_extent = extent;
m_viewTarget = viewTarget;
m_config = config;
m_edmItemCollection = entityContainerMapping.StorageMappingItemCollection.EdmItemCollection;
m_entityContainerMapping = entityContainerMapping;
m_identifiers = identifiers;
// create a copy of updateDomainMap so generation of query views later on is not affected
// it is modified in QueryRewriter.AdjustMemberDomainsForUpdateViews
updateDomainMap = updateDomainMap.MakeCopy();
// Create a signature generator that handles all the
// multiconstant work and generating the signatures
var domainMap = viewTarget == ViewTarget.QueryView ? queryDomainMap : updateDomainMap;
m_memberMaps = new MemberMaps(
viewTarget, MemberProjectionIndex.Create(extent, m_edmItemCollection), queryDomainMap, updateDomainMap);
// Create left fragment KB: includes constraints for the extent to be constructed
var leftKB = new FragmentQueryKBChaseSupport();
leftKB.CreateVariableConstraints(extent, domainMap, m_edmItemCollection);
m_leftFragmentQP = new FragmentQueryProcessor(leftKB);
m_rewritingCache = new Dictionary <FragmentQuery, Tile <FragmentQuery> >(
FragmentQuery.GetEqualityComparer(m_leftFragmentQP));
// Now using the signatures, create new cells such that
// "extent's" query (C or S) is described in terms of multiconstants
if (!CreateLeftCellWrappers(extentCells, viewTarget))
{
return;
}
// Create right fragment KB: includes constraints for all extents and association roles of right queries
var rightKB = new FragmentQueryKBChaseSupport();
var rightDomainMap = viewTarget == ViewTarget.QueryView ? updateDomainMap : queryDomainMap;
foreach (var leftCellWrapper in m_cellWrappers)
{
var rightExtent = leftCellWrapper.RightExtent;
rightKB.CreateVariableConstraints(rightExtent, rightDomainMap, m_edmItemCollection);
rightKB.CreateAssociationConstraints(rightExtent, rightDomainMap, m_edmItemCollection);
}
if (m_viewTarget == ViewTarget.UpdateView)
{
CreateConstraintsForForeignKeyAssociationsAffectingThisWrapper(rightKB, rightDomainMap);
}
m_rightFragmentQP = new FragmentQueryProcessor(rightKB);
// Check for concurrency control tokens
if (m_viewTarget == ViewTarget.QueryView)
{
CheckConcurrencyControlTokens();
}
// For backward compatibility -
// order wrappers by increasing domain size, decreasing number of attributes
m_cellWrappers.Sort(LeftCellWrapper.Comparer);
}
