protected override void PreParse()
{
Debug.Assert(State != EFElementState.Parsed, "this object should not already be in the parsed state");
ClearEFObject(_principal);
_principal = null;
ClearEFObject(_dependent);
_dependent = null;
base.PreParse();
}
protected override void OnChildDeleted(EFContainer efContainer)
{
if (efContainer == _principal)
{
_principal = null;
return;
}
if (efContainer == _dependent)
{
_dependent = null;
return;
}
base.OnChildDeleted(efContainer);
}
internal override bool ParseSingleElement(ICollection <XName> unprocessedElements, XElement elem)
{
if (elem.Name.LocalName == ElementNamePrincipal)
{
_principal = new ReferentialConstraintRole(this, elem);
_principal.Parse(unprocessedElements);
}
else if (elem.Name.LocalName == ElementNameDependent)
{
_dependent = new ReferentialConstraintRole(this, elem);
_dependent.Parse(unprocessedElements);
}
else
{
return(base.ParseSingleElement(unprocessedElements, elem));
}
return(true);
}
protected override void InvokeInternal(CommandProcessorContext cpc)
{
Debug.Assert(
PrincipalEnd != null && DependentEnd != null, "InvokeInternal is called when PrincipalEnd or DependentEnd is null.");
if (PrincipalEnd == null
|| DependentEnd == null)
{
throw new InvalidOperationException("InvokeInternal is called when PrincipalEnd or DependentEnd is null.");
}
var association = PrincipalEnd.Parent as Association;
Debug.Assert(
association != null && association == DependentEnd.Parent, "Association parent for both ends must agree and be not null");
var principalProps = PrincipalProperties.ToList();
var dependentProps = DependentProperties.ToList();
Debug.Assert(principalProps.Count == dependentProps.Count, "Number of principal and dependent properties must agree");
Debug.Assert(principalProps.Count > 0, "Number of properties must be positive");
var referentialConstraint = new ReferentialConstraint(association, null);
association.ReferentialConstraint = referentialConstraint;
XmlModelHelper.NormalizeAndResolve(referentialConstraint);
var principalRole = new ReferentialConstraintRole(referentialConstraint, null);
var dependentRole = new ReferentialConstraintRole(referentialConstraint, null);
var service = cpc.EditingContext.GetEFArtifactService();
// we can't pass the type of referential constraint role ("Principal" or "Dependent")
// in the constructor because XElement gets created in base constructor
// before we have a chance to set any properties
if (association.EntityModel.IsCSDL)
{
var csdlNamespaceName = SchemaManager.GetCSDLNamespaceName(service.Artifact.SchemaVersion);
principalRole.XElement.Name = XName.Get(ReferentialConstraint.ElementNamePrincipal, csdlNamespaceName);
dependentRole.XElement.Name = XName.Get(ReferentialConstraint.ElementNameDependent, csdlNamespaceName);
}
else
{
var ssdlNamespaceName = SchemaManager.GetSSDLNamespaceName(service.Artifact.SchemaVersion);
principalRole.XElement.Name = XName.Get(ReferentialConstraint.ElementNamePrincipal, ssdlNamespaceName);
dependentRole.XElement.Name = XName.Get(ReferentialConstraint.ElementNameDependent, ssdlNamespaceName);
}
principalRole.Role.SetRefName(PrincipalEnd);
dependentRole.Role.SetRefName(DependentEnd);
referentialConstraint.Principal = principalRole;
referentialConstraint.Dependent = dependentRole;
XmlModelHelper.NormalizeAndResolve(principalRole);
XmlModelHelper.NormalizeAndResolve(dependentRole);
for (var i = 0; i < principalProps.Count; i++)
{
principalRole.AddPropertyRef(principalProps[i]);
dependentRole.AddPropertyRef(dependentProps[i]);
}
Debug.Assert(
principalProps.Count == 0
|| (principalRole.PropertyRefs.First().Name.Target != null && dependentRole.PropertyRefs.First().Name.Target != null),
"Unresolved property references");
_createdRefConstraint = referentialConstraint;
}
protected override void OnChildDeleted(EFContainer efContainer)
{
if (efContainer == _principal)
{
_principal = null;
return;
}
if (efContainer == _dependent)
{
_dependent = null;
return;
}
base.OnChildDeleted(efContainer);
}
internal override bool ParseSingleElement(ICollection<XName> unprocessedElements, XElement elem)
{
if (elem.Name.LocalName == ElementNamePrincipal)
{
_principal = new ReferentialConstraintRole(this, elem);
_principal.Parse(unprocessedElements);
}
else if (elem.Name.LocalName == ElementNameDependent)
{
_dependent = new ReferentialConstraintRole(this, elem);
_dependent.Parse(unprocessedElements);
}
else
{
return base.ParseSingleElement(unprocessedElements, elem);
}
return true;
}
protected override void PreParse()
{
Debug.Assert(State != EFElementState.Parsed, "this object should not already be in the parsed state");
ClearEFObject(_principal);
_principal = null;
ClearEFObject(_dependent);
_dependent = null;
base.PreParse();
}
private static bool HasIdenticalKeyToEntityType(ReferentialConstraintRole refConstraintRole)
{
if (null == refConstraintRole
|| null == refConstraintRole.Role
|| null == refConstraintRole.Role.Target
|| null == refConstraintRole.Role.Target.Type
|| null == refConstraintRole.Role.Target.Type.Target)
{
// no resolved EntityType - cannot match keys
return false;
}
// find list of properties representing PK of EntityType
var et = refConstraintRole.Role.Target.Type.Target;
var cet = et as ConceptualEntityType;
Debug.Assert(
cet != null,
"expected EntityType of type ConceptualEntityType, instead type is " + (et == null ? "null" : et.GetType().FullName));
var etKeyProps = new HashSet<Property>();
foreach (var p in cet.ResolvableTopMostBaseType.ResolvableKeys)
{
etKeyProps.Add(p);
}
// find list of properties referenced in the ReferentialConstraintRole
var refConstraintProps = new HashSet<Property>();
foreach (var propRef in refConstraintRole.PropertyRefs)
{
if (null != propRef.Name.Target)
{
refConstraintProps.Add(propRef.Name.Target);
}
}
// if the counts of properties in refConstraintProps and etKeyProps
// are not the same then the keys cannot be identical
if (etKeyProps.Count != refConstraintProps.Count)
{
return false;
}
// remove all the refConstraintProps properties from etKeyProps,
// if any are left then the key has not been covered
etKeyProps.ExceptWith(refConstraintProps);
return (etKeyProps.Count == 0);
}