// effects: Returns the key for entityType prefixed with prefix (for
// its memberPath)
internal static ExtentKey GetPrimaryKeyForEntityType(MemberPath prefix, EntityType entityType)
{
var keyFields = new List<MemberPath>();
foreach (var keyMember in entityType.KeyMembers)
{
Debug.Assert(keyMember != null, "Bogus key member in metadata");
keyFields.Add(new MemberPath(prefix, keyMember));
}
// Just have one key for now
var key = new ExtentKey(keyFields);
return key;
}
// effects: Returns a key correspnding to all the fields in different
// ends of relationtype prefixed with "prefix"
internal static ExtentKey GetKeyForRelationType(MemberPath prefix, AssociationType relationType)
{
var keyFields = new List<MemberPath>();
foreach (var endMember in relationType.AssociationEndMembers)
{
var endPrefix = new MemberPath(prefix, endMember);
var entityType = MetadataHelper.GetEntityTypeForEnd(endMember);
var primaryKey = GetPrimaryKeyForEntityType(endPrefix, entityType);
keyFields.AddRange(primaryKey.KeyFields);
}
var key = new ExtentKey(keyFields);
return key;
}
// requires: this to correspond to a cell relation for an association set (m_cellQuery.Extent)
// effects: Adds any key constraints present in this relation in
// constraints
private void PopulateKeyConstraintsForRelationshipSet(BasicSchemaConstraints constraints)
{
AssociationSet relationshipSet = m_cellQuery.Extent as AssociationSet;
// Gather all members of all keys
// CHANGE_Microsoft_FEATURE_KEYS: assume that an Entity has exactly one key. Otherwise we
// have to take a cross-product of all keys
// Keep track of all the key members for the association in a set
// so that if no end corresponds to a key, we use all the members
// to form the key
Set<MemberPath> associationKeyMembers = new Set<MemberPath>(MemberPath.EqualityComparer);
bool hasAnEndThatFormsKey = false;
// Determine the keys of each end. If the end forms a key, add it
// as a key to the set
foreach (AssociationSetEnd end in relationshipSet.AssociationSetEnds)
{
AssociationEndMember endMember = end.CorrespondingAssociationEndMember;
MemberPath prefix = new MemberPath(relationshipSet, endMember);
List<ExtentKey> keys = ExtentKey.GetKeysForEntityType(prefix, end.EntitySet.ElementType);
Debug.Assert(keys.Count > 0, "No keys for entity?");
Debug.Assert(keys.Count == 1, "Currently, we only support primary keys");
if (MetadataHelper.DoesEndFormKey(relationshipSet, endMember))
{
// This end has is a key end
AddKeyConstraints(keys, constraints);
hasAnEndThatFormsKey = true;
}
// Add the members of the (only) key to associationKey
associationKeyMembers.AddRange(keys[0].KeyFields);
}
// If an end forms a key then that key implies the full key
if (false == hasAnEndThatFormsKey)
{
// No end is a key -- take all the end members and make a key
// based on that
ExtentKey key = new ExtentKey(associationKeyMembers);
ExtentKey[] keys = new ExtentKey[] { key };
AddKeyConstraints(keys, constraints);
}
}
// effects: Returns an error record if the keys of the extent/associationSet being mapped are
// present in the projected slots of this query. Returns null
// otherwise. ownerCell indicates the cell that owns this and
// resourceString is a resource used for error messages
internal ErrorLog.Record VerifyKeysPresent(Cell ownerCell, Func <object, object, string> formatEntitySetMessage,
Func <object, object, object, string> formatAssociationSetMessage, ViewGenErrorCode errorCode)
{
List <MemberPath> prefixes = new List <MemberPath>(1);
// Keep track of the key corresponding to each prefix
List <ExtentKey> keys = new List <ExtentKey>(1);
if (Extent is EntitySet)
{
// For entity set just get the full path of the key properties
MemberPath prefix = new MemberPath(Extent);
prefixes.Add(prefix);
EntityType entityType = (EntityType)Extent.ElementType;
List <ExtentKey> entitySetKeys = ExtentKey.GetKeysForEntityType(prefix, entityType);
Debug.Assert(entitySetKeys.Count == 1, "Currently, we only support primary keys");
keys.Add(entitySetKeys[0]);
}
else
{
AssociationSet relationshipSet = (AssociationSet)Extent;
// For association set, get the full path of the key
// properties of each end
foreach (AssociationSetEnd relationEnd in relationshipSet.AssociationSetEnds)
{
AssociationEndMember assocEndMember = relationEnd.CorrespondingAssociationEndMember;
MemberPath prefix = new MemberPath(relationshipSet, assocEndMember);
prefixes.Add(prefix);
List <ExtentKey> endKeys = ExtentKey.GetKeysForEntityType(prefix,
MetadataHelper.GetEntityTypeForEnd(assocEndMember));
Debug.Assert(endKeys.Count == 1, "Currently, we only support primary keys");
keys.Add(endKeys[0]);
}
}
for (int i = 0; i < prefixes.Count; i++)
{
MemberPath prefix = prefixes[i];
// Get all or none key slots that are being projected in this cell query
List <MemberProjectedSlot> keySlots = MemberProjectedSlot.GetKeySlots(GetMemberProjectedSlots(), prefix);
if (keySlots == null)
{
ExtentKey key = keys[i];
string message;
if (Extent is EntitySet)
{
string keyPropertiesString = MemberPath.PropertiesToUserString(key.KeyFields, true);
message = formatEntitySetMessage(keyPropertiesString, Extent.Name);
}
else
{
string endName = prefix.RootEdmMember.Name;
string keyPropertiesString = MemberPath.PropertiesToUserString(key.KeyFields, false);
message = formatAssociationSetMessage(keyPropertiesString, endName, Extent.Name);
}
ErrorLog.Record error = new ErrorLog.Record(true, errorCode, message, ownerCell, String.Empty);
return(error);
}
}
return(null);
}