/// <summary>
/// Returns the association information for the specified navigation property.
/// </summary>
/// <param name="navigationProperty">The navigation property to return association information for</param>
/// <returns>The association info</returns>
internal AssociationInfo GetAssociationInfo(NavigationProperty navigationProperty)
{
lock (this._associationMap)
{
string associationName = navigationProperty.RelationshipType.FullName;
AssociationInfo associationInfo = null;
if (!this._associationMap.TryGetValue(associationName, out associationInfo))
{
AssociationType associationType = (AssociationType)navigationProperty.RelationshipType;
if (!associationType.ReferentialConstraints.Any())
{
// We only support EF models where FK info is part of the model.
throw new NotSupportedException(
string.Format(CultureInfo.CurrentCulture,
Resource.LinqToEntitiesProvider_UnableToRetrieveAssociationInfo, associationName));
}
associationInfo = new AssociationInfo();
associationInfo.FKRole = associationType.ReferentialConstraints[0].ToRole.Name;
associationInfo.Name = this.GetAssociationName(navigationProperty, associationInfo.FKRole);
associationInfo.ThisKey = associationType.ReferentialConstraints[0].ToProperties.Select(p => p.Name).ToArray();
associationInfo.OtherKey = associationType.ReferentialConstraints[0].FromProperties.Select(p => p.Name).ToArray();
associationInfo.IsRequired = associationType.RelationshipEndMembers[0].RelationshipMultiplicity == RelationshipMultiplicity.One;
this._associationMap[associationName] = associationInfo;
}
return(associationInfo);
}
}
/// <summary>
/// Creates an AssociationAttribute for the specified navigation property
/// </summary>
/// <param name="navigationProperty">The navigation property that corresponds to the association (it identifies the end points)</param>
/// <returns>A new AssociationAttribute that describes the given navigation property association</returns>
internal AssociationAttribute CreateAssociationAttribute(NavigationProperty navigationProperty)
{
AssociationInfo assocInfo = this.GetAssociationInfo(navigationProperty);
bool isForeignKey = navigationProperty.FromEndMember.Name == assocInfo.FKRole;
string thisKey;
string otherKey;
if (isForeignKey)
{
thisKey = FormatMemberList(assocInfo.ThisKey);
otherKey = FormatMemberList(assocInfo.OtherKey);
}
else
{
otherKey = FormatMemberList(assocInfo.ThisKey);
thisKey = FormatMemberList(assocInfo.OtherKey);
}
AssociationAttribute assocAttrib = new AssociationAttribute(assocInfo.Name, thisKey, otherKey);
assocAttrib.IsForeignKey = isForeignKey;
return(assocAttrib);
}
/// <summary>
/// Returns the association information for the specified navigation property.
/// </summary>
/// <param name="navigationProperty">The navigation property to return association information for</param>
/// <returns>The association info</returns>
internal AssociationInfo GetAssociationInfo(NavigationProperty navigationProperty)
{
lock (this._associationMap)
{
string associationName = navigationProperty.RelationshipType.FullName;
AssociationInfo associationInfo = null;
if (!this._associationMap.TryGetValue(associationName, out associationInfo))
{
AssociationType associationType = (AssociationType)navigationProperty.RelationshipType;
if (!associationType.ReferentialConstraints.Any())
{
// We only support EF models where FK info is part of the model.
throw new NotSupportedException(
string.Format(CultureInfo.CurrentCulture,
Resource.LinqToEntitiesProvider_UnableToRetrieveAssociationInfo, associationName));
}
associationInfo = new AssociationInfo();
associationInfo.FKRole = associationType.ReferentialConstraints[0].ToRole.Name;
associationInfo.Name = this.GetAssociationName(navigationProperty, associationInfo.FKRole);
associationInfo.ThisKey = associationType.ReferentialConstraints[0].ToProperties.Select(p => p.Name).ToArray();
associationInfo.OtherKey = associationType.ReferentialConstraints[0].FromProperties.Select(p => p.Name).ToArray();
associationInfo.IsRequired = associationType.RelationshipEndMembers[0].RelationshipMultiplicity == RelationshipMultiplicity.One;
this._associationMap[associationName] = associationInfo;
}
return associationInfo;
}
}
