/// <summary>
/// see whether the ReferentialConstraintIdentity in other contains a "covering" for
/// this._referentialConstraintIdentity (for definition of "covering" see
/// method ReferentialConstraintIdentity.IsCoveredBy(ReferentialConstraintIdentity))
/// </summary>
internal bool IsCoveredBy(AssociationIdentityForReferentialConstraint other)
{
if (_referentialConstraintIdentity == null)
{
// if _referentialConstraintIdentity is null then anything covers it
return true;
}
return _referentialConstraintIdentity.IsCoveredBy(other._referentialConstraintIdentity);
}
/// <summary>
/// see whether the ReferentialConstraintIdentity in other contains a "covering" for
/// this._referentialConstraintIdentity (for definition of "covering" see
/// method ReferentialConstraintIdentity.IsCoveredBy(ReferentialConstraintIdentity))
/// </summary>
internal bool IsCoveredBy(AssociationIdentityForReferentialConstraint other)
{
if (_referentialConstraintIdentity == null)
{
// if _referentialConstraintIdentity is null then anything covers it
return(true);
}
return(_referentialConstraintIdentity.IsCoveredBy(other._referentialConstraintIdentity));
}
internal static AssociationSummary ConstructAssociationSummary(EFArtifact artifact)
{
var ecm = artifact.MappingModel().FirstEntityContainerMapping;
var summary = new AssociationSummary();
if (!EdmFeatureManager.GetForeignKeysInModelFeatureState(artifact.SchemaVersion).IsEnabled())
{
if (ecm != null)
{
// Foreign keys in the model are not supported for this EDMX version.
foreach (var asm in ecm.AssociationSetMappings())
{
var cSideAssociation = asm.TypeName.Target;
if (null != cSideAssociation)
{
var assocId = AssociationIdentityForAssociationSetMapping.CreateAssociationIdentity(asm);
if (null != assocId)
{
summary.Add(cSideAssociation, assocId);
}
}
}
}
}
else
{
// Foreign keys in the model are supported for this EDMX version.
foreach (var a in artifact.ConceptualModel().Associations())
{
AssociationIdentity assocId = null;
if (a.IsManyToMany == false &&
a.ReferentialConstraint != null)
{
assocId = AssociationIdentityForReferentialConstraint.CreateAssociationIdentity(a.ReferentialConstraint);
}
else
{
var asm = ModelHelper.FindAssociationSetMappingForConceptualAssociation(a);
if (asm != null)
{
assocId = AssociationIdentityForAssociationSetMapping.CreateAssociationIdentity(asm);
}
}
if (null != assocId)
{
summary.Add(a, assocId);
}
}
}
return(summary);
}
/// <summary>
/// returns true if the AssociationSetMapping is covered by the referential constraint.
/// "covers" means that the
/// 1. The columns mapped to the RC's principal keys match the columns mapped to the
/// association's principal keys.
/// 2. For each "pair" of properties that match between the RC & the ASM, the
/// ASM's mapped column is contained in the dependent columns of the RC.
/// </summary>
private static bool IsCoveredBy(AssociationIdentityForReferentialConstraint assRC, AssociationIdentityForAssociationSetMapping asmid)
{
// get the principal end of the association
var principalEnd = asmid.GetPrincipalEnd();
if (principalEnd == null)
{
return(false);
}
foreach (var p1 in principalEnd.GetPropertyMappingIdentities())
{
// find the "equivalent" property mapping identity in the referential constraint
// this is the property mapping identity whose Principal side columns match the
// Principal side columns on this property of the association end.
AssociationPropertyIdentity rcEquivalent = null;
foreach (var p2 in assRC.ReferentialConstraintIdentity.PropertyIdentities)
{
if (AssociationPropertyIdentityComparer.Instance.Compare(p1, p2) == 0)
{
rcEquivalent = p2;
break;
}
}
// if we couldn't find an identity in the RC whose "Principal" columns matched those
// in the principal association end, return false
if (rcEquivalent == null)
{
return(false);
}
//
// now check that for each database column in "Dependent" part of the association end,
// (ie, each column mapped as part of the association set mapping)
// it exists in the referential constraint's right columns (ie, the RC's dependent columns)
//
// Note that we don't do an equality check here, as the conceptual property in an RC
// may be mapped to multiple tables, while the association set mapping will only ever be
// mapped to one table.
//
foreach (var dc in p1.DependentColumns)
{
if (rcEquivalent.DependentColumns.Contains(dc) == false)
{
return(false);
}
}
}
return(true);
}
internal static AssociationIdentity CreateAssociationIdentity(ReferentialConstraint rc)
{
if (rc == null)
{
Debug.Fail("You passed a null Referential Constraint to CreateAssociationIdentity!");
}
else
{
var id = new AssociationIdentityForReferentialConstraint(rc);
return(id);
}
return(null);
}
/// <summary>
/// returns true if the AssociationSetMapping is covered by the referential constraint.
/// "covers" means that the
/// 1. The columns mapped to the RC's principal keys match the columns mapped to the
/// association's principal keys.
/// 2. For each "pair" of properties that match between the RC & the ASM, the
/// ASM's mapped column is contained in the dependent columns of the RC.
/// </summary>
private static bool IsCoveredBy(AssociationIdentityForReferentialConstraint assRC, AssociationIdentityForAssociationSetMapping asmid)
{
// get the principal end of the association
var principalEnd = asmid.GetPrincipalEnd();
if (principalEnd == null)
{
return false;
}
foreach (var p1 in principalEnd.GetPropertyMappingIdentities())
{
// find the "equivalent" property mapping identity in the referential constraint
// this is the property mapping identity whose Principal side columns match the
// Principal side columns on this property of the association end.
AssociationPropertyIdentity rcEquivalent = null;
foreach (var p2 in assRC.ReferentialConstraintIdentity.PropertyIdentities)
{
if (AssociationPropertyIdentityComparer.Instance.Compare(p1, p2) == 0)
{
rcEquivalent = p2;
break;
}
}
// if we couldn't find an identity in the RC whose "Principal" columns matched those
// in the principal association end, return false
if (rcEquivalent == null)
{
return false;
}
//
// now check that for each database column in "Dependent" part of the association end,
// (ie, each column mapped as part of the association set mapping)
// it exists in the referential constraint's right columns (ie, the RC's dependent columns)
//
// Note that we don't do an equality check here, as the conceptual property in an RC
// may be mapped to multiple tables, while the association set mapping will only ever be
// mapped to one table.
//
foreach (var dc in p1.DependentColumns)
{
if (rcEquivalent.DependentColumns.Contains(dc) == false)
{
return false;
}
}
}
return true;
}
internal static AssociationIdentity CreateAssociationIdentity(ReferentialConstraint rc)
{
if (rc == null)
{
Debug.Fail("You passed a null Referential Constraint to CreateAssociationIdentity!");
}
else
{
var id = new AssociationIdentityForReferentialConstraint(rc);
return id;
}
return null;
}
