/// <summary>
/// Takes in a JoinTreeNode and a Contition Property Map and creates an BoolExpression
/// for the Condition Map.
/// </summary>
/// <param name="joinTreeNode"></param>
/// <param name="conditionMap"></param>
/// <returns></returns>
private static BoolExpression GetConditionExpression(MemberPath member, StorageConditionPropertyMapping conditionMap)
{
//Get the member for which the condition is being specified
EdmMember conditionMember = (conditionMap.ColumnProperty != null) ? conditionMap.ColumnProperty : conditionMap.EdmProperty;
MemberPath conditionMemberNode = new MemberPath(member, conditionMember);
//Check if this is a IsNull condition
MemberRestriction conditionExpression = null;
if (conditionMap.IsNull.HasValue)
{
// for conditions on scalars, create NodeValue nodes, otherwise NodeType
Constant conditionConstant = (true == conditionMap.IsNull.Value) ? Constant.Null : Constant.NotNull;
if (true == MetadataHelper.IsNonRefSimpleMember(conditionMember))
{
conditionExpression = new ScalarRestriction(conditionMemberNode, conditionConstant);
}
else
{
conditionExpression = new TypeRestriction(conditionMemberNode, conditionConstant);
}
}
else
{
conditionExpression = new ScalarRestriction(conditionMemberNode, new ScalarConstant(conditionMap.Value));
}
Debug.Assert(conditionExpression != null);
return(BoolExpression.CreateLiteral(conditionExpression, null));
}
public void AddEntityTypeMappingFragment(
EntitySet entitySet, EntityType entityType, StorageMappingFragment fragment)
{
Debug.Assert(fragment.Table == Table);
_entityTypes.Add(entitySet, entityType);
var defaultDiscriminatorColumn = fragment.GetDefaultDiscriminator();
StorageConditionPropertyMapping defaultDiscriminatorCondition = null;
if (defaultDiscriminatorColumn != null)
{
defaultDiscriminatorCondition =
fragment.ColumnConditions.SingleOrDefault(cc => cc.ColumnProperty == defaultDiscriminatorColumn);
}
foreach (var pm in fragment.ColumnMappings)
{
var columnMapping = FindOrCreateColumnMapping(pm.ColumnProperty);
columnMapping.AddMapping(
entityType,
pm.PropertyPath,
fragment.ColumnConditions.Where(cc => cc.ColumnProperty == pm.ColumnProperty),
defaultDiscriminatorColumn == pm.ColumnProperty);
}
// Add any column conditions that aren't mapped to properties
foreach (
var cc in
fragment.ColumnConditions.Where(cc => !fragment.ColumnMappings.Any(pm => pm.ColumnProperty == cc.ColumnProperty)))
{
var columnMapping = FindOrCreateColumnMapping(cc.ColumnProperty);
columnMapping.AddMapping(entityType, null, new[] { cc }, defaultDiscriminatorColumn == cc.ColumnProperty);
}
}
private void WriteConditionElement(StorageConditionPropertyMapping condition)
{
_xmlWriter.WriteStartElement(StorageMslConstructs.ConditionElement);
if (condition.IsNull.HasValue)
{
_xmlWriter.WriteAttributeString(
StorageMslConstructs.ConditionIsNullAttribute, GetLowerCaseStringFromBoolValue(condition.IsNull.Value));
}
else
{
if (condition.Value is bool)
{
_xmlWriter.WriteAttributeString(StorageMslConstructs.ConditionValueAttribute, (bool)condition.Value ? "1" : "0");
}
else
{
_xmlWriter.WriteAttributeString(StorageMslConstructs.ConditionValueAttribute, condition.Value.ToString());
}
}
_xmlWriter.WriteAttributeString(StorageMslConstructs.ConditionColumnNameAttribute, condition.ColumnProperty.Name);
_xmlWriter.WriteEndElement();
}
// 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);
}
}
}
}
/// <summary>
/// Takes in a JoinTreeNode and a Contition Property Map and creates an BoolExpression
/// for the Condition Map.
/// </summary>
/// <param name="joinTreeNode"> </param>
/// <param name="conditionMap"> </param>
/// <returns> </returns>
private static BoolExpression GetConditionExpression(MemberPath member, StorageConditionPropertyMapping conditionMap)
{
//Get the member for which the condition is being specified
EdmMember conditionMember = (conditionMap.ColumnProperty != null) ? conditionMap.ColumnProperty : conditionMap.EdmProperty;
var conditionMemberNode = new MemberPath(member, conditionMember);
//Check if this is a IsNull condition
MemberRestriction conditionExpression = null;
if (conditionMap.IsNull.HasValue)
{
// for conditions on scalars, create NodeValue nodes, otherwise NodeType
var conditionConstant = conditionMap.IsNull.Value ? Constant.Null : Constant.NotNull;
if (MetadataHelper.IsNonRefSimpleMember(conditionMember))
{
conditionExpression = new ScalarRestriction(conditionMemberNode, conditionConstant);
}
else
{
conditionExpression = new TypeRestriction(conditionMemberNode, conditionConstant);
}
}
else
{
conditionExpression = new ScalarRestriction(conditionMemberNode, new ScalarConstant(conditionMap.Value));
}
Debug.Assert(conditionExpression != null);
return BoolExpression.CreateLiteral(conditionExpression, null);
}
