/// <summary>
/// Get the names of appropriate navigation properties from metadata.
/// </summary>
/// <param name="sc">The service context.</param>
/// <param name="type">The navigation property type.</param>
/// <returns>Returns the list of navigation property names.</returns>
public static List<string> GetAppropriateNavigationPropertyNames(ServiceContext sc, NavigationPropertyType type)
{
if (sc == null)
{
return null;
}
List<string> result = new List<string>();
string xpath = string.Format("//*[local-name()='EntityType' and @Name='{0}']/*[local-name()='NavigationProperty']", sc.EntityTypeShortName);
XElement metadata = XElement.Parse(sc.MetadataDocument);
var navigProps = metadata.XPathSelectElements(xpath, ODataNamespaceManager.Instance);
if (ODataVersion.V4 == sc.Version)
{
var collectionTypeNavigProps = NavigationPropertyType.SetOfEntities == type ?
navigProps.Where(np => np.Attribute(@"Type").Value.Contains(@"Collection")) :
navigProps.Where(np => !np.Attribute(@"Type").Value.Contains(@"Collection"));
foreach (var ctnp in collectionTypeNavigProps)
{
result.Add(ctnp.Attribute(@"Name").Value);
}
}
else
{
string typeFlag = NavigationPropertyType.SetOfEntities == type ? @"*" : @"0..1";
xpath = string.Format("//*[local-name()='EntityType' and @Name='{0}']", sc.EntityTypeShortName);
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.LoadXml(sc.MetadataDocument);
XmlNode entityTypeNode = xmlDoc.SelectSingleNode(xpath, ODataNamespaceManager.Instance);
string odataNamespace = string.Empty;
if (null != entityTypeNode.ParentNode.Attributes[@"Namespace"])
{
odataNamespace = entityTypeNode.ParentNode.Attributes[@"Namespace"].Value;
}
string associNameFilter = @"1!=1";
string toRoleNameFilter = @"1!=1";
foreach (var np in navigProps)
{
string associName = np.Attribute(@"Relationship").Value.Remove(0, (odataNamespace + @".").Length);
associNameFilter += @" or " + string.Format(@"@Name='{0}'", associName);
string toRoleName = np.Attribute(@"ToRole").Value;
toRoleNameFilter += @" or " + string.Format(@"@Role='{0}'", toRoleName);
}
xpath = string.Format(@"//*[local-name()='Association'][{0}]/*[local-name()='End'][@Multiplicity='{1}' and ({2})]", associNameFilter, typeFlag, toRoleNameFilter);
XmlNodeList endNodes = xmlDoc.SelectNodes(xpath, ODataNamespaceManager.Instance);
List<string> toRoleNames = new List<string>();
foreach (XmlNode en in endNodes)
{
toRoleNames.Add(en.Attributes[@"Role"].Value);
}
foreach (var np in navigProps)
{
if (toRoleNames.Contains(np.Attribute(@"ToRole").Value))
{
result.Add(np.Attribute(@"Name").Value);
}
}
}
return result;
}
/// <summary>
/// Get the URLs of entity sets which have a specified navigation property.
/// </summary>
/// <param name="sc">The service context.</param>
/// <param name="navigPropType">The type of navigation property.</param>
/// <returns>Returns a list contatins all the appropriate entity set URLs.</returns>
public static List<string> GetEntitySetUrlsContainsCurrentEntityTypeName(ServiceContext sc, NavigationPropertyType navigPropType)
{
if (sc == null)
{
return new List<string>();
}
string entityTypeNs = sc.EntityTypeFullName.RemoveEnd(sc.EntityTypeShortName);
string target = NavigationPropertyType.SetOfEntities == navigPropType ?
string.Format("Collection({0})", sc.EntityTypeFullName) :
sc.EntityTypeFullName;
string xpath = string.Format("//*[local-name()='EntityType']/*[local-name()='NavigationProperty' and @Type='{0}']", target);
XElement metadata = XElement.Parse(sc.MetadataDocument);
var navigProps = metadata.XPathSelectElements(xpath, ODataNamespaceManager.Instance).ToList();
if (navigProps == null)
{
return new List<string>();
}
var entityTypeElementNames = new List<string>();
navigProps.ForEach(n => entityTypeElementNames.Add(entityTypeNs + n.Parent.Attribute("Name").Value));
xpath = @"//*[local-name()='EntityContainer']/*[local-name()='EntitySet']";
var allEntitySetElements = metadata.XPathSelectElements(xpath, ODataNamespaceManager.Instance).ToList();
if (allEntitySetElements == null)
{
return new List<string>();
}
var entitySetElementNames = allEntitySetElements
.FindAll(entitySet => entityTypeElementNames.Contains(entitySet.Attribute("EntityType").Value))
.Select(entitySet => entitySet.Attribute("Name").Value);
JObject service = JObject.Parse(sc.ServiceDocument);
var entities = JsonParserHelper.GetEntries(service).ToList();
if (entities == null)
{
return new List<string>();
}
return entities.Where(e => entitySetElementNames.Contains(e["name"].ToString())).Select(e => e["url"].ToString()).ToList();
}
public static Dictionary<string, string> GetAppropriateNavigationPropertyNameAndType(string entityTypeName, string metadataDocument, NavigationPropertyType type)
{
Dictionary<string, string> result = new Dictionary<string, string>();
string xpath = string.Format("//*[local-name()='EntityType' and @Name='{0}']/*[local-name()='NavigationProperty']", entityTypeName);
XElement metadata = XElement.Parse(metadataDocument);
var navigProps = metadata.XPathSelectElements(xpath, ODataNamespaceManager.Instance);
var collectionTypeNavigProps = NavigationPropertyType.SetOfEntities == type ?
navigProps.Where(np => np.Attribute(@"Type").Value.Contains(@"Collection")) :
navigProps.Where(np => !np.Attribute(@"Type").Value.Contains(@"Collection"));
foreach (var ctnp in collectionTypeNavigProps)
{
result.Add(ctnp.GetAttributeValue("Name"), ctnp.GetAttributeValue("Type"));
}
return result;
}
