private bool HasAssociationChanged(MetaAssociation assoc, TrackedObject item)
{
if (item.Original != null && item.Current != null)
{
if (assoc.ThisMember.StorageAccessor.HasAssignedValue(item.Current) ||
assoc.ThisMember.StorageAccessor.HasLoadedValue(item.Current)
)
{
return(this.GetOtherItem(assoc, item.Current) != this.GetOtherItem(assoc, item.Original));
}
else
{
object[] currentFKs = CommonDataServices.GetForeignKeyValues(assoc, item.Current);
object[] originaFKs = CommonDataServices.GetForeignKeyValues(assoc, item.Original);
for (int i = 0, n = currentFKs.Length; i < n; i++)
{
if (!object.Equals(currentFKs[i], originaFKs[i]))
{
return(true);
}
}
}
}
return(false);
}
internal RelationComposer(ParameterExpression parameter, MetaAssociation association, Expression otherSouce, Expression parameterReplacement)
{
this.parameter = parameter ?? throw Error.ArgumentNull(nameof(parameter));
this.association = association ?? throw Error.ArgumentNull(nameof(association));
this.otherSouce = otherSouce ?? throw Error.ArgumentNull(nameof(otherSouce));
this.parameterReplacement = parameterReplacement ?? throw Error.ArgumentNull(nameof(parameterReplacement));
}
/// <summary>
/// Returns a unique association name for the specified MetaAssociation
/// </summary>
/// <param name="metaAssociation">A <see cref="MetaAssociation"/>.</param>
/// <returns>A <see cref="String"/> containing the association name.</returns>
private string GetAssociationName(MetaAssociation metaAssociation)
{
lock (this._associationNameMap)
{
// We need a unique key for this association, so we use the MetaAssociation
// itself. In the case of bi-directional associations, we use the FK side.
if (!metaAssociation.IsForeignKey && metaAssociation.OtherMember != null)
{
metaAssociation = metaAssociation.OtherMember.Association;
}
string associationName = null;
if (!this._associationNameMap.TryGetValue(metaAssociation, out associationName))
{
// names are always formatted non-FK side type name followed by FK side type name
// For example, the name for both ends of the PurchaseOrder/PurchaseOrderDetail
// association will be PurchaseOrder_PurchaseOrderDetail
if (metaAssociation.IsForeignKey)
{
associationName = string.Format(CultureInfo.InvariantCulture, "{0}_{1}", metaAssociation.OtherType.Name, metaAssociation.ThisMember.DeclaringType.Name);
}
else
{
associationName = string.Format(CultureInfo.InvariantCulture, "{0}_{1}", metaAssociation.ThisMember.DeclaringType.Name, metaAssociation.OtherType.Name);
}
associationName = TypeDescriptionContextBase.MakeUniqueName(associationName, this._associationNameMap.Values);
this._associationNameMap[metaAssociation] = associationName;
}
return(associationName);
}
}
private static ResolvedJoinInfo CreateResolvedJoinInfo(
SqlEntityExpression originatingEntity, MetaAssociation metaAssociation, IResolvedTableInfo joinedTableInfo)
{
var leftColumn = ResolveMember(originatingEntity, metaAssociation.ThisKey);
// If needed, implement by using compounds (NewExpressions with named arguments, see NamedExpression.CreateNewExpressionWithNamedArguments.)
if (metaAssociation.OtherKey.Count > 1)
{
throw new NotSupportedException(
string.Format(
"Associations with more than one column are currently not supported. ({0}.{1})",
originatingEntity.Type,
metaAssociation.OtherMember.Name));
}
var otherKey = metaAssociation.OtherKey[0];
var rightColumn = new SqlColumnDefinitionExpression(
otherKey.Type,
joinedTableInfo.TableAlias,
otherKey.MappedName,
otherKey.IsPrimaryKey);
var joinCondition = ConversionUtility.MakeBinaryWithOperandConversion(ExpressionType.Equal, leftColumn, rightColumn, false, null);
return(new ResolvedJoinInfo(joinedTableInfo, joinCondition));
}
private IEnumerable <string> GetDropForeignKeyCommands(MetaTable metaTable)
{
var metaType = metaTable.RowType;
foreach (var member in metaType.DataMembers)
{
if (member.IsDeclaredBy(metaType) && member.IsAssociation)
{
MetaAssociation association = member.Association;
var stringBuilder = new StringBuilder();
var mappedName = member.MappedName;
if (mappedName == member.Name)
{
mappedName = string.Format(CultureInfo.InvariantCulture, "FK_{0}_{1}", SqlIdentifier.UnquoteIdentifier(metaType.Table.TableName),
SqlIdentifier.UnquoteIdentifier(member.Name));
}
var command = string.Format("SELECT count(*) FROM RDB$RELATION_CONSTRAINTS WHERE UPPER(RDB$CONSTRAINT_NAME) = '{0}'", mappedName.ToUpper());
var result = sqlProvider.services.Context.ExecuteQuery <int>(command).Single();
if (result == 0)
{
continue;
}
command = "ALTER TABLE {0}" + Environment.NewLine + " DROP CONSTRAINT {1}";
var tableName = association.IsForeignKey ? metaType.Table.TableName : association.OtherType.Table.TableName;
yield return(stringBuilder.AppendFormat(command, new object[]
{
tableName,
mappedName,
}).ToString());
}
}
}
// Ensure the the member and foreign keys are nulled so that after trackedInstance is deleted,
// the object does not appear to be associated with the other side anymore. This prevents the deleted object
// from referencing objects still in the cache, but also will prevent the related object from being implicitly loaded
private static void ClearForeignKeysHelper(MetaAssociation assoc, object trackedInstance)
{
Debug.Assert(assoc.IsForeignKey, "Foreign key clearing should only happen on foreign key side of the association.");
Debug.Assert(assoc.ThisMember.IsAssociation, "Expected ThisMember of an association to always be an association.");
// If this member is one of our deferred loaders, and it does not already have a value, explicitly set the deferred source to
// null so that when we set the association member itself to null later, it doesn't trigger an implicit load.
// This is only necessary if the value has not already been assigned or set, because otherwise we won't implicitly load anyway when the member is accessed.
MetaDataMember thisMember = assoc.ThisMember;
if (thisMember.IsDeferred &&
!(thisMember.StorageAccessor.HasAssignedValue(trackedInstance) || thisMember.StorageAccessor.HasLoadedValue(trackedInstance)))
{
// If this is a deferred member, set the value directly in the deferred accessor instead of going
// through the normal member accessor, so that we don't trigger an implicit load.
thisMember.DeferredSourceAccessor.SetBoxedValue(ref trackedInstance, null);
}
// Notify the object that the relationship should be considered deleted.
// This allows the object to do its own fixup even when we can't do it automatically.
thisMember.MemberAccessor.SetBoxedValue(ref trackedInstance, null);
// Also set the foreign key values to null if possible
for (int i = 0, n = assoc.ThisKey.Count; i < n; i++)
{
MetaDataMember thisKey = assoc.ThisKey[i];
if (thisKey.CanBeNull)
{
thisKey.StorageAccessor.SetBoxedValue(ref trackedInstance, null);
}
}
}
private void SetAssociationKeyInfo(MetaAssociation association)
{
DLinqColumnProvider column = (DLinqColumnProvider)FromColumn;
List <string> foreignKeyNames = new List <string>();
int count = column.Member.Association.ThisKey.Count;
for (int i = 0; i < count; i++)
{
MetaDataMember thisKeyMetaDataMember = column.Member.Association.ThisKey[i];
MetaDataMember otherKeyMetaDataMember = column.Member.Association.OtherKey[i];
DLinqColumnProvider thisEntityMemberComponent = FindColumn(column.Table, thisKeyMetaDataMember.Name);
if (ShouldRemoveThisAssociation(association))
{
column.ShouldRemove = true;
return;
}
foreignKeyNames.Add(thisEntityMemberComponent.Name);
if (thisEntityMemberComponent.IsPrimaryKey)
{
IsPrimaryKeyInThisTable = true;
}
if (association.IsForeignKey)
{
thisEntityMemberComponent.IsForeignKeyComponent = true;
}
}
ForeignKeyNames = new ReadOnlyCollection <string>(foreignKeyNames);
}
public Association(MetaAssociation metaAssociation, Guid associationId, Guid itemSourceId, Guid itemTargetId, string associationName)
: base(metaAssociation, associationId)
{
this.itemSourceId = itemSourceId;
this.itemTargetId = itemTargetId;
this.associationName = associationName;
}
internal void Add(MetaAssociation assoc, TrackedObject from, TrackedObject to)
{
if (!associations.TryGetValue(assoc, out var value))
{
value = new Dictionary <TrackedObject, TrackedObject>();
associations.Add(assoc, value);
}
value.Add(from, to);
}
internal TrackedObject this[MetaAssociation assoc, TrackedObject from] {
get {
if (associations.TryGetValue(assoc, out var value) && value.TryGetValue(from, out var value2))
{
return(value2);
}
return(null);
}
}
internal static object[] GetForeignKeyValues(MetaAssociation association, object instance)
{
var list = new List <object>();
foreach (MetaDataMember member in association.ThisKey)
{
list.Add(member.MemberAccessor.GetBoxedValue(instance));
}
return(list.ToArray());
}
internal static object[] GetForeignKeyValues(MetaAssociation association, object instance)
{
List <object> keyValues = new List <object>();
foreach (MetaDataMember mm in association.ThisKey)
{
keyValues.Add(mm.MemberAccessor.GetBoxedValue(instance));
}
return(keyValues.ToArray());
}
internal void Add(MetaAssociation assoc, TrackedObject from, TrackedObject to)
{
Dictionary <TrackedObject, TrackedObject> dictionary;
if (!this.associations.TryGetValue(assoc, out dictionary))
{
dictionary = new Dictionary <TrackedObject, TrackedObject>();
this.associations.Add(assoc, dictionary);
}
dictionary.Add(from, to);
}
internal void Add(MetaAssociation assoc, TrackedObject from, TrackedObject to)
{
Dictionary <TrackedObject, TrackedObject> pairs;
if (!associations.TryGetValue(assoc, out pairs))
{
pairs = new Dictionary <TrackedObject, TrackedObject>();
associations.Add(assoc, pairs);
}
pairs.Add(from, to);
}
// Properties
internal TrackedObject this[MetaAssociation assoc, TrackedObject from]
{
get
{
Dictionary <TrackedObject, TrackedObject> dictionary;
TrackedObject obj2;
if (this.associations.TryGetValue(assoc, out dictionary) && dictionary.TryGetValue(from, out obj2))
{
return(obj2);
}
return(null);
}
}
/// <summary>
/// Returns an AssociationAttribute for the specified association member
/// </summary>
/// <param name="member">The metadata member corresponding to the association member</param>
/// <returns>The Association attribute</returns>
public System.ComponentModel.DataAnnotations.AssociationAttribute CreateAssociationAttribute(MetaDataMember member)
{
MetaAssociation metaAssociation = member.Association;
string associationName = this.GetAssociationName(metaAssociation);
string thisKey = TypeDescriptionContextBase.FormatMemberList(metaAssociation.ThisKey.Select(p => p.Name));
string otherKey = TypeDescriptionContextBase.FormatMemberList(metaAssociation.OtherKey.Select(p => p.Name));
System.ComponentModel.DataAnnotations.AssociationAttribute assocAttrib = new System.ComponentModel.DataAnnotations.AssociationAttribute(associationName, thisKey, otherKey);
assocAttrib.IsForeignKey = metaAssociation.IsForeignKey;
return(assocAttrib);
}
public DLinqAssociationProvider(DLinqColumnProvider column)
{
FromColumn = column;
MetaAssociation association = column.Member.Association;
SetOtherEndOfAssociation(association);
SetDirection(association);
Debug.Assert(Direction != AssociationDirection.ManyToMany, "Many to Many is not supported by Linq to SQL");
SetAssociationKeyInfo(association);
}
private IEnumerable <string> GetCreateForeignKeyCommands(MetaType metaType)
{
foreach (var member in metaType.DataMembers)
{
if (member.IsDeclaredBy(metaType) && member.IsAssociation)
{
MetaAssociation association = member.Association;
if (association.IsForeignKey)
{
var stringBuilder = new StringBuilder();
var thisKey = BuildKey(association.ThisKey);
var otherKey = BuildKey(association.OtherKey);
var otherTable = association.OtherType.Table.TableName;
var mappedName = member.MappedName;
if (mappedName == member.Name)
{
mappedName = string.Format(CultureInfo.InvariantCulture, "FK_{0}_{1}",
new object[] { QuoteCompoundIdentifier(metaType.Table.TableName), QuoteIdentifier(member.Name) });
}
var command = "ALTER TABLE {0}" + Environment.NewLine + " ADD CONSTRAINT {1} FOREIGN KEY ({2}) REFERENCES {3}({4})";
string deleteRule = " NO ACTION";
var otherMember = association.OtherMember;
if (otherMember != null)
{
if (association.DeleteRule != null)
{
deleteRule = association.DeleteRule;
}
//if (deleteRule != null)
//{
// command += Environment.NewLine + " ON DELETE " + deleteRule;
//}
}
stringBuilder.AppendFormat(command, new object[]
{
QuoteCompoundIdentifier(metaType.Table.TableName),
QuoteIdentifier(mappedName),
thisKey,
QuoteCompoundIdentifier(otherTable),
otherKey
});
//ON DELETE NO ACTION
stringBuilder.AppendLine();
stringBuilder.AppendLine("ON DELETE" + deleteRule);
stringBuilder.AppendLine("ON UPDATE NO ACTION");
yield return(stringBuilder.ToString());
}
}
}
}
internal TrackedObject this[MetaAssociation assoc, TrackedObject from] {
get {
Dictionary <TrackedObject, TrackedObject> pairs;
if (associations.TryGetValue(assoc, out pairs))
{
TrackedObject to;
if (pairs.TryGetValue(from, out to))
{
return(to);
}
}
return(null);
}
}
private void SetOtherEndOfAssociation(MetaAssociation association)
{
DLinqTableProvider entityMemberParentEntity = (DLinqTableProvider)FromColumn.Table;
DLinqDataModelProvider parentEntityDataContext = (DLinqDataModelProvider)entityMemberParentEntity.DataModel;
if (association.OtherMember != null)
{
ToColumn = parentEntityDataContext.ColumnLookup[(PropertyInfo)association.OtherMember.Member];
}
else
{
ToTable = ((DLinqDataModelProvider)FromColumn.Table.DataModel).DLinqTables.Single(tp => tp.EntityType == association.OtherType.Type);
}
}
internal Expression GetDataMemberQuery(MetaDataMember member, Expression[] keyValues)
{
if (member == null)
{
throw Error.ArgumentNull("member");
}
if (keyValues == null)
{
throw Error.ArgumentNull("keyValues");
}
if (member.IsAssociation)
{
MetaAssociation association = member.Association;
Type rootType = association.ThisMember.DeclaringType.InheritanceRoot.Type;
Expression thisSource = Expression.Constant(context.GetTable(rootType));
if (rootType != association.ThisMember.DeclaringType.Type)
{
thisSource = Expression.Call(typeof(Enumerable), "Cast", new Type[] { association.ThisMember.DeclaringType.Type }, thisSource);
}
Expression thisInstance = Expression.Call(typeof(Enumerable), "FirstOrDefault", new Type[] { association.ThisMember.DeclaringType.Type },
System.Data.Linq.SqlClient.Translator.WhereClauseFromSourceAndKeys(thisSource, association.ThisKey.ToArray(), keyValues)
);
Expression otherSource = Expression.Constant(context.GetTable(association.OtherType.InheritanceRoot.Type));
if (association.OtherType.Type != association.OtherType.InheritanceRoot.Type)
{
otherSource = Expression.Call(typeof(Enumerable), "Cast", new Type[] { association.OtherType.Type }, otherSource);
}
Expression expr = System.Data.Linq.SqlClient.Translator.TranslateAssociation(
this.context, association, otherSource, keyValues, thisInstance
);
return(expr);
}
else
{
Expression query = this.GetObjectQuery(member.DeclaringType, keyValues);
Type elementType = System.Data.Linq.SqlClient.TypeSystem.GetElementType(query.Type);
ParameterExpression p = Expression.Parameter(elementType, "p");
Expression e = p;
if (elementType != member.DeclaringType.Type)
{
e = Expression.Convert(e, member.DeclaringType.Type);
}
Expression mem = (member.Member is PropertyInfo)
? Expression.Property(e, (PropertyInfo)member.Member)
: Expression.Field(e, (FieldInfo)member.Member);
LambdaExpression selector = Expression.Lambda(mem, p);
return(Expression.Call(typeof(Queryable), "Select", new Type[] { elementType, selector.Body.Type }, query, selector));
}
}
private void SetDirection(MetaAssociation association)
{
if (association.IsMany)
{
Direction = AssociationDirection.OneToMany;
}
else if (association.OtherMember == null || association.OtherMember.Association.IsMany)
{
// there might not be the other member if this is a one-sided association
Direction = AssociationDirection.ManyToOne;
}
else
{
Direction = AssociationDirection.OneToOne;
}
}
private static IEnumerable <String> GetCreateForeignKeyCommands(MetaType type)
{
string tableName = type.Table.TableName;
foreach (MetaDataMember mm in type.DataMembers)
{
if (mm.IsDeclaredBy(type) && mm.IsAssociation)
{
MetaAssociation assoc = mm.Association;
if (assoc.IsForeignKey)
{
StringBuilder sb = new StringBuilder();
string thisKey = BuildKey(assoc.ThisKey);
string otherKey = BuildKey(assoc.OtherKey);
string otherTable = assoc.OtherType.Table.TableName;
string name;
name = mm.MappedName;
if (name == mm.Name)
{
name = String.Format(Globalization.CultureInfo.InvariantCulture, "FK_{0}_{1}", tableName, mm.Name);
}
string cmd = "ALTER TABLE {0}" + Environment.NewLine + " ADD CONSTRAINT {1} FOREIGN KEY ({2}) REFERENCES {3}({4})";
//In DLinq we put the constraint on the child object (which triggers the behavior when deleted),
//but in SQL it is part of the parent constraint (the parent row gets changed / deleted to satisfy the constraint)
MetaDataMember otherMember = mm.Association.OtherMember;
if (otherMember != null)
{
string delConstr = otherMember.Association.DeleteRule;
if (delConstr != null)
{
cmd += Environment.NewLine + " ON DELETE " + delConstr;
}
}
sb.AppendFormat(cmd,
SqlIdentifier.QuoteCompoundIdentifier(tableName),
SqlIdentifier.QuoteIdentifier(name),
SqlIdentifier.QuoteCompoundIdentifier(thisKey),
SqlIdentifier.QuoteCompoundIdentifier(otherTable),
SqlIdentifier.QuoteCompoundIdentifier(otherKey));
yield return(sb.ToString());
}
}
}
}
/// <summary>
/// Creates the explicit join method call.
/// </summary>
/// <param name="member">
/// The member.
/// </param>
/// <param name="objectMetaType">
/// Type of the object meta.
/// </param>
/// <param name="selector">
/// The selector.
/// </param>
/// <returns>
/// Explicit join method call expression
/// </returns>
private Expression CreateExplicitJoinMethodCall(MemberExpression member, MetaType objectMetaType, MethodInfo selector)
{
MetaAssociation association = objectMetaType.Associations.Where(a => a.ThisMember.Member == member.Member).SingleOrDefault();
Expression visitedMemberExpression = this.Visit(member.Expression);
var thisSideKeyExpression =
Expression.Convert(
Expression.Property(visitedMemberExpression, association.ThisKey.Single().Member as PropertyInfo),
typeof(object));
var thisPropertyExpression = Expression.Constant(association.OtherKey.Single().Member, typeof(PropertyInfo));
var repositoryConst = Expression.Constant(this.IndexesCache);
var explicitJoinMethodCallExpression = Expression.Call(repositoryConst, selector, thisPropertyExpression, thisSideKeyExpression);
return(explicitJoinMethodCallExpression);
}
public void Many_To_One()
{
MetaType metaType = db.Configuration.Model.GetMetaType(typeof(Model.EmployeeTerritory));
Assert.AreEqual(2, metaType.Associations.Count);
MetaAssociation assoc = metaType.Associations[1];
Assert.IsFalse(assoc.IsMany);
Assert.IsTrue(assoc.OtherKeyIsPrimaryKey);
Assert.AreEqual(typeof(Model.EmployeeTerritory), assoc.ThisMember.DeclaringType.Type);
Assert.AreEqual(nameof(Model.EmployeeTerritory.Employee), assoc.ThisMember.Name);
Assert.AreEqual(typeof(Model.Employee), assoc.ThisMember.Type);
Assert.AreEqual(typeof(Model.Employee), assoc.OtherMember.DeclaringType.Type);
Assert.AreEqual(nameof(Model.Employee.EmployeeTerritories), assoc.OtherMember.Name);
Assert.AreEqual(typeof(Collection <Model.EmployeeTerritory>), assoc.OtherMember.Type);
}
private static void ClearForeignKeysHelper(MetaAssociation assoc, object trackedInstance)
{
var thisMember = assoc.ThisMember;
if (thisMember.IsDeferred && !thisMember.StorageAccessor.HasAssignedValue(trackedInstance) && !thisMember.StorageAccessor.HasLoadedValue(trackedInstance))
{
thisMember.DeferredSourceAccessor.SetBoxedValue(ref trackedInstance, null);
}
thisMember.MemberAccessor.SetBoxedValue(ref trackedInstance, null);
var i = 0;
for (var count = assoc.ThisKey.Count; i < count; i++)
{
var metaDataMember = assoc.ThisKey[i];
if (metaDataMember.CanBeNull)
{
metaDataMember.StorageAccessor.SetBoxedValue(ref trackedInstance, null);
}
}
}
internal Expression GetDataMemberQuery(MetaDataMember member, Expression[] keyValues)
{
if (member == null)
{
throw Error.ArgumentNull("member");
}
if (keyValues == null)
{
throw Error.ArgumentNull("keyValues");
}
if (member.IsAssociation)
{
MetaAssociation association = member.Association;
Type type = association.ThisMember.DeclaringType.InheritanceRoot.Type;
Expression source = Expression.Constant(Context.GetTable(type));
if (type != association.ThisMember.DeclaringType.Type)
{
source = Expression.Call(typeof(Enumerable), "Cast", new[] { association.ThisMember.DeclaringType.Type }, new[] { source });
}
Expression thisInstance = Expression.Call(typeof(Enumerable), "FirstOrDefault", new[] { association.ThisMember.DeclaringType.Type }, new[] { Translator.WhereClauseFromSourceAndKeys(source, association.ThisKey.ToArray(), keyValues) });
Expression otherSource = Expression.Constant(Context.GetTable(association.OtherType.InheritanceRoot.Type));
if (association.OtherType.Type != association.OtherType.InheritanceRoot.Type)
{
otherSource = Expression.Call(typeof(Enumerable), "Cast", new[] { association.OtherType.Type }, new[] { otherSource });
}
return(Translator.TranslateAssociation(Context, association, otherSource, keyValues, thisInstance));
}
Expression objectQuery = GetObjectQuery(member.DeclaringType, keyValues);
Type elementType = TypeSystem.GetElementType(objectQuery.Type);
ParameterExpression expression6 = Expression.Parameter(elementType, "p");
Expression expression7 = expression6;
if (elementType != member.DeclaringType.Type)
{
expression7 = Expression.Convert(expression7, member.DeclaringType.Type);
}
Expression body = (member.Member is PropertyInfo) ? Expression.Property(expression7, (PropertyInfo)member.Member) : Expression.Field(expression7, (FieldInfo)member.Member);
LambdaExpression expression9 = Expression.Lambda(body, new[] { expression6 });
return(Expression.Call(typeof(Queryable), "Select", new[] { elementType, expression9.Body.Type }, new[] { objectQuery, expression9 }));
}
private bool HasAssociationChanged(MetaAssociation assoc, TrackedObject item)
{
if (item.Original != null && item.Current != null)
{
if (assoc.ThisMember.StorageAccessor.HasAssignedValue(item.Current) || assoc.ThisMember.StorageAccessor.HasLoadedValue(item.Current))
{
return(GetOtherItem(assoc, item.Current) != GetOtherItem(assoc, item.Original));
}
var foreignKeyValues = CommonDataServices.GetForeignKeyValues(assoc, item.Current);
var foreignKeyValues2 = CommonDataServices.GetForeignKeyValues(assoc, item.Original);
var i = 0;
for (var num = foreignKeyValues.Length; i < num; i++)
{
if (!object.Equals(foreignKeyValues[i], foreignKeyValues2[i]))
{
return(true);
}
}
}
return(false);
}
internal static Expression TranslateAssociation(DataContext context, MetaAssociation association, Expression otherSource, Expression[] keyValues, Expression thisInstance)
{
if (association == null)
{
throw Error.ArgumentNull("association");
}
if (keyValues == null)
{
throw Error.ArgumentNull("keyValues");
}
if (context.LoadOptions != null)
{
LambdaExpression associationSubquery = context.LoadOptions.GetAssociationSubquery(association.ThisMember.Member);
if (associationSubquery != null)
{
var composer = new RelationComposer(associationSubquery.Parameters[0], association, otherSource, thisInstance);
return(composer.Visit(associationSubquery.Body));
}
}
return(WhereClauseFromSourceAndKeys(otherSource, association.OtherKey.ToArray <MetaDataMember>(), keyValues));
}
private TrackedObject GetOtherItem(MetaAssociation assoc, object instance)
{
if (instance == null)
{
return(null);
}
object obj = null;
if (assoc.ThisMember.StorageAccessor.HasAssignedValue(instance) || assoc.ThisMember.StorageAccessor.HasLoadedValue(instance))
{
obj = assoc.ThisMember.MemberAccessor.GetBoxedValue(instance);
}
else if (assoc.OtherKeyIsPrimaryKey)
{
var foreignKeyValues = CommonDataServices.GetForeignKeyValues(assoc, instance);
obj = services.GetCachedObject(assoc.OtherType, foreignKeyValues);
}
if (obj == null)
{
return(null);
}
return(tracker.GetTrackedObject(obj));
}
internal RelationComposer(ParameterExpression parameter, MetaAssociation association, Expression otherSouce, Expression parameterReplacement)
{
if (parameter == null)
{
throw Error.ArgumentNull("parameter");
}
if (association == null)
{
throw Error.ArgumentNull("association");
}
if (otherSouce == null)
{
throw Error.ArgumentNull("otherSouce");
}
if (parameterReplacement == null)
{
throw Error.ArgumentNull("parameterReplacement");
}
this.parameter = parameter;
this.association = association;
this.otherSouce = otherSouce;
this.parameterReplacement = parameterReplacement;
}
