private static IEnumerable <ODataExpandAssociation> MergeExpandAssociations(ODataExpandAssociation first, ODataExpandAssociation second)
{
if (first.Name != second.Name && first.Name != "*")
{
return new [] { first, second }
}
;
var result = first.Clone();
result.OrderByColumns.AddRange(second.OrderByColumns.Except(first.OrderByColumns));
result.ExpandAssociations.Clear();
var groupedExpandAssociations = first.ExpandAssociations
.Concat(second.ExpandAssociations)
.GroupBy(x => x);
var mergedExpandAssociations = groupedExpandAssociations
.Select(x =>
{
var mainAssociation = x.Key;
foreach (var association in x.Where(a => a != mainAssociation))
{
mainAssociation = MergeExpandAssociations(mainAssociation, association).First();
mainAssociation.OrderByColumns.AddRange(association.OrderByColumns.Except(mainAssociation.OrderByColumns));
}
return(mainAssociation);
});
result.ExpandAssociations.AddRange(mergedExpandAssociations);
return(new [] { result });
}
private string FormatExpansionSegment(ODataExpandAssociation association, EntityCollection entityCollection,
ODataExpandOptions expandOptions, ResolvedCommand command, bool rootLevel = true)
{
if (rootLevel)
{
association = command.Details.SelectColumns.Aggregate(association, MergeExpandAssociations);
association = command.Details.OrderbyColumns.Aggregate(association, MergeOrderByColumns);
}
var associationName = association.Name;
var expandsToCollection = false;
if (_session.Metadata.HasNavigationProperty(entityCollection.Name, associationName))
{
associationName = _session.Metadata.GetNavigationPropertyExactName(entityCollection.Name, associationName);
expandsToCollection = _session.Metadata.IsNavigationPropertyCollection(entityCollection.Name, associationName);
}
var clauses = new List <string>();
var text = associationName;
if (association.TypeName != null)
{
text = association.TypeName + "/" + text;
}
if (expandOptions.ExpandMode == ODataExpandMode.ByReference)
{
text += "/" + ODataLiteral.Ref;
}
if (expandOptions.Levels > 1)
{
clauses.Add($"{ODataLiteral.Levels}={expandOptions.Levels}");
}
else if (expandOptions.Levels == 0)
{
clauses.Add($"{ODataLiteral.Levels}={ODataLiteral.Max}");
}
if (associationName != StarString)
{
if (expandsToCollection && !ReferenceEquals(association.FilterExpression, null))
{
var associatedEntityCollection = _session.Metadata.GetEntityCollection(
_session.Metadata.GetNavigationPropertyPartnerTypeName(entityCollection.Name, associationName));
clauses.Add(
$"{ODataLiteral.Filter}={EscapeUnescapedString(association.FilterExpression.Format(new ExpressionContext(_session, associatedEntityCollection, null, command.DynamicPropertiesContainerName)))}");
}
if (association.ExpandAssociations.Any())
{
var associatedEntityCollection = _session.Metadata.GetEntityCollection(
_session.Metadata.GetNavigationPropertyPartnerTypeName(entityCollection.Name, associationName));
var expandAll = association.ExpandAssociations.FirstOrDefault(a => a.Name == StarString);
if (expandAll != null)
{
clauses.Add($"{ODataLiteral.Expand}=*");
}
else
{
var expandedProperties = string.Join(",", association.ExpandAssociations
.Where(
a => _session.Metadata.HasNavigationProperty(associatedEntityCollection.Name, a.Name))
.Select(a =>
FormatExpansionSegment(a, associatedEntityCollection, ODataExpandOptions.ByValue(),
command,
false)));
if (!string.IsNullOrEmpty(expandedProperties))
{
clauses.Add($"{ODataLiteral.Expand}={expandedProperties}");
}
}
var selectColumns = string.Join(",", association.ExpandAssociations
.Where(a => a.Name != StarString &&
!_session.Metadata.HasNavigationProperty(associatedEntityCollection.Name, a.Name))
.Select(a => a.Name));
if (!string.IsNullOrEmpty(selectColumns))
{
clauses.Add($"{ODataLiteral.Select}={selectColumns}");
}
}
if (expandsToCollection && association.OrderByColumns.Any())
{
var columns = string.Join(",", association.OrderByColumns
.Select(o => o.Name + (o.Descending ? " desc" : string.Empty)));
if (!string.IsNullOrEmpty(columns))
{
clauses.Add($"{ODataLiteral.OrderBy}={columns}");
}
}
}
if (clauses.Any())
{
text += $"({string.Join(";", clauses)})";
}
return(text);
}
private static ODataExpandAssociation MergeExpandAssociations(ODataExpandAssociation expandAssociation, string path)
{
return(MergeExpandAssociations(expandAssociation, ODataExpandAssociation.From(path)).First());
}
public FT Expand(ODataExpandOptions expandOptions, params ODataExpression[] associations)
{
Command.Expand(expandOptions, associations.Select(a => ODataExpandAssociation.From(a.Reference)));
return(this as FT);
}
public void CreateExpandAssociationFromString()
{
var association = ODataExpandAssociation.From("Products");
Assert.Equal("Products", association.Name);
}
public void CreateExpandAssociationFromEmptyStringThrowsArgumentException()
{
Assert.Throws <ArgumentException>(() => ODataExpandAssociation.From(string.Empty));
}
public void CreateExpandAssociationFromNullStringThrowsArgumentException()
{
Assert.Throws <ArgumentException>(() => ODataExpandAssociation.From(null));
}
