private bool TryGetWithRelationship(StorageAssociationSetMapping colocatedAssociationSetMap,
EntitySetBase thisExtent,
MemberPath sRootNode,
ref List <SlotInfo> foreignKeySlots,
out WithRelationship withRelationship)
{
Debug.Assert(foreignKeySlots != null);
withRelationship = null;
//Get the map for foreign key end
StorageEndPropertyMapping foreignKeyEndMap = GetForeignKeyEndMapFromAssocitionMap(colocatedAssociationSetMap, thisExtent);
if (foreignKeyEndMap == null || foreignKeyEndMap.EndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many)
{
return(false);
}
AssociationEndMember toEnd = (AssociationEndMember)foreignKeyEndMap.EndMember;
AssociationEndMember fromEnd = MetadataHelper.GetOtherAssociationEnd(toEnd);
EntityType toEndEntityType = (EntityType)((RefType)(toEnd.TypeUsage.EdmType)).ElementType;
EntityType fromEndEntityType = (EntityType)(((RefType)fromEnd.TypeUsage.EdmType).ElementType);
// Get the member path for AssociationSet
AssociationSet associationSet = (AssociationSet)colocatedAssociationSetMap.Set;
MemberPath prefix = new MemberPath(associationSet, toEnd);
// Collect the member paths for edm scalar properties that belong to the target entity key.
// These will be used as part of WITH RELATIONSHIP.
// Get the key properties from edm type since the query parser depends on the order of key members
IEnumerable <StorageScalarPropertyMapping> propertyMaps = foreignKeyEndMap.Properties.Cast <StorageScalarPropertyMapping>();
List <MemberPath> toEndEntityKeyMemberPaths = new List <MemberPath>();
foreach (EdmProperty edmProperty in toEndEntityType.KeyMembers)
{
IEnumerable <StorageScalarPropertyMapping> scalarPropertyMaps = propertyMaps.Where(propMap => (propMap.EdmProperty.Equals(edmProperty)));
Debug.Assert(scalarPropertyMaps.Count() == 1, "Can't Map the same column multiple times in the same end");
StorageScalarPropertyMapping scalarPropertyMap = scalarPropertyMaps.First();
// Create SlotInfo for Freign Key member that needs to be projected.
MemberProjectedSlot sSlot = new MemberProjectedSlot(new MemberPath(sRootNode, scalarPropertyMap.ColumnProperty));
MemberPath endMemberKeyPath = new MemberPath(prefix, edmProperty);
toEndEntityKeyMemberPaths.Add(endMemberKeyPath);
foreignKeySlots.Add(new SlotInfo(true, true, sSlot, endMemberKeyPath));
}
// Parent assignable from child: Ensures they are in the same hierarchy.
if (thisExtent.ElementType.IsAssignableFrom(fromEndEntityType))
{
// Now create the WITH RELATIONSHIP with all the needed info.
withRelationship = new WithRelationship(associationSet, fromEnd, fromEndEntityType, toEnd, toEndEntityType, toEndEntityKeyMemberPaths);
return(true);
}
else
{
return(false);
}
}
private void WritePropertyMapping(StorageScalarPropertyMapping scalarPropertyMapping)
{
DebugCheck.NotNull(scalarPropertyMapping);
WriteScalarPropertyElement(scalarPropertyMapping.EdmProperty, scalarPropertyMapping.ColumnProperty);
}
// requires: "properties" corresponds to all the properties that are
// inside cNode.Value, e.g., cNode corresponds to an extent Person,
// properties contains all the properties inside Person (recursively)
// effects: Given C-side and S-side Cell Query for a cell, generates
// the projected slots on both sides corresponding to
// properties. Also updates the C-side whereclause corresponding to
// discriminator properties on the C-side, e.g, isHighPriority
private void ExtractProperties(IEnumerable <StoragePropertyMapping> properties,
MemberPath cNode, List <ProjectedSlot> cSlots,
ref BoolExpression cQueryWhereClause,
MemberPath sRootExtent,
List <ProjectedSlot> sSlots,
ref BoolExpression sQueryWhereClause)
{
// For each property mapping, we add an entry to the C and S cell queries
foreach (StoragePropertyMapping propMap in properties)
{
StorageScalarPropertyMapping scalarPropMap = propMap as StorageScalarPropertyMapping;
StorageComplexPropertyMapping complexPropMap = propMap as StorageComplexPropertyMapping;
StorageEndPropertyMapping associationEndPropertypMap = propMap as StorageEndPropertyMapping;
StorageConditionPropertyMapping conditionMap = propMap as StorageConditionPropertyMapping;
Debug.Assert(scalarPropMap != null ||
complexPropMap != null ||
associationEndPropertypMap != null ||
conditionMap != null, "Unimplemented property mapping");
if (scalarPropMap != null)
{
Debug.Assert(scalarPropMap.ColumnProperty != null, "ColumnMember for a Scalar Property can not be null");
// Add an attribute node to node
MemberPath cAttributeNode = new MemberPath(cNode, scalarPropMap.EdmProperty);
// Add a column (attribute) node the sQuery
// unlike the C side, there is no nesting. Hence we
// did not need an internal node
MemberPath sAttributeNode = new MemberPath(sRootExtent, scalarPropMap.ColumnProperty);
cSlots.Add(new MemberProjectedSlot(cAttributeNode));
sSlots.Add(new MemberProjectedSlot(sAttributeNode));
}
// Note: S-side constants are not allowed since they can cause
// problems -- for example, if such a cell says 5 for the
// third field, we cannot guarantee the fact that an
// application may not set that field to 7 in the C-space
// Check if the property mapping is for a complex types
if (complexPropMap != null)
{
foreach (StorageComplexTypeMapping complexTypeMap in complexPropMap.TypeMappings)
{
// Create a node for the complex type property and call recursively
MemberPath complexMemberNode = new MemberPath(cNode, complexPropMap.EdmProperty);
//Get the list of types that this type map represents
Set <EdmType> allTypes = new Set <EdmType>();
// Gather a set of all explicit types for an entity
// type mapping in allTypes.
IEnumerable <EdmType> exactTypes = Helpers.AsSuperTypeList <ComplexType, EdmType>(complexTypeMap.Types);
allTypes.AddRange(exactTypes);
foreach (EdmType type in complexTypeMap.IsOfTypes)
{
allTypes.AddRange(MetadataHelper.GetTypeAndSubtypesOf(type, m_containerMapping.StorageMappingItemCollection.EdmItemCollection, false /*includeAbstractTypes*/));
}
BoolExpression complexInTypes = BoolExpression.CreateLiteral(new TypeRestriction(complexMemberNode, allTypes), null);
cQueryWhereClause = BoolExpression.CreateAnd(cQueryWhereClause, complexInTypes);
// Now extract the properties of the complex type
// (which could have other complex types)
ExtractProperties(complexTypeMap.AllProperties, complexMemberNode, cSlots,
ref cQueryWhereClause, sRootExtent, sSlots, ref sQueryWhereClause);
}
}
// Check if the property mapping is for an associaion
if (associationEndPropertypMap != null)
{
// create join tree node representing this relation end
MemberPath associationEndNode = new MemberPath(cNode, associationEndPropertypMap.EndMember);
// call recursively
ExtractProperties(associationEndPropertypMap.Properties, associationEndNode, cSlots,
ref cQueryWhereClause, sRootExtent, sSlots, ref sQueryWhereClause);
}
//Check if the this is a condition and add it to the Where clause
if (conditionMap != null)
{
if (conditionMap.ColumnProperty != null)
{
//Produce a Condition Expression for the Condition Map.
BoolExpression conditionExpression = GetConditionExpression(sRootExtent, conditionMap);
//Add the condition expression to the exisiting S side Where clause using an "And"
sQueryWhereClause = BoolExpression.CreateAnd(sQueryWhereClause, conditionExpression);
}
else
{
Debug.Assert(conditionMap.EdmProperty != null);
//Produce a Condition Expression for the Condition Map.
BoolExpression conditionExpression = GetConditionExpression(cNode, conditionMap);
//Add the condition expression to the exisiting C side Where clause using an "And"
cQueryWhereClause = BoolExpression.CreateAnd(cQueryWhereClause, conditionExpression);
}
}
}
}
private void WritePropertyMapping(StorageScalarPropertyMapping scalarPropertyMapping)
{
WriteScalarPropertyElement(scalarPropertyMapping.EdmProperty, scalarPropertyMapping.ColumnProperty);
}