/// <summary>
/// Get the template of an specified entity.
/// </summary>
/// <param name="entitySetName">The entity-type short name.</param>
/// <param name="actualEntityTypeShortName">The actual entity-type short name.</param>
/// <returns>Returns the entity template.</returns>
private JObject GetEntityDataTemplate(string entitySetName, string actualEntityTypeShortName = null)
{
if (string.IsNullOrEmpty(entitySetName) && !entitySetName.IsSpecifiedEntitySetNameExist())
{
return(null);
}
// Map 'entity-set name' to 'entity-type short name'.
string entityTypeShortName = entitySetName.MapEntitySetNameToEntityTypeShortName();
string targetShortName = string.IsNullOrEmpty(actualEntityTypeShortName) ? entityTypeShortName : actualEntityTypeShortName;
if (string.IsNullOrEmpty(entityTypeShortName))
{
throw new Exception("Failed to convert entity-set name to entity-type short name.");
}
var keyProperties = MetadataHelper.GetKeyProperties(this.metadataDoc, entityTypeShortName);
JObject entity = null;
// The multiple-key entities are very complex to construct, so the program only filter the single-key entities.
if (null != keyProperties && 1 == keyProperties.Count())
{
var keyProperty = keyProperties.First();
if (!KeyPropertyTypes.Contains(keyProperty.PropertyType))
{
return(entity);
}
// Convert 'entity-set name' to 'entity-set URL'.
string entitySetURL = entitySetName.MapEntitySetNameToEntitySetURL();
if (string.IsNullOrEmpty(entitySetURL))
{
throw new Exception("Failed to convert to entity-set name to entity-set URL.");
}
string url = string.Format("{0}/{1}", this.rootURL.TrimEnd('/'), entitySetURL);
var resp = WebHelper.Get(new Uri(url), Constants.V4AcceptHeaderJsonFullMetadata, RuleEngineSetting.Instance().DefaultMaximumPayloadSize, null);
if (null != resp && HttpStatusCode.OK == resp.StatusCode)
{
JObject feed;
resp.ResponsePayload.TryToJObject(out feed);
if (null != feed)
{
var entries = JsonParserHelper.GetEntries(feed);
if (null != entries && entries.Any())
{
// If the current entity-type is a derived type, the program will get the entity with derived type from the feed.
// Otherwise, it will get the first entity from the feed.
entity = !string.IsNullOrEmpty(actualEntityTypeShortName) && actualEntityTypeShortName.IsSpecifiedEntityTypeShortNameExist() ?
this.GetDerivedEntity(entries, actualEntityTypeShortName) : entries.First as JObject;
// Set the new key value for the selected entity.
object keyValTemp = IntKeyPropertyTypes.Contains(keyProperty.PropertyType)
? this.GetMaxEntityKey(entries, keyProperty.PropertyName)
: entity[keyProperty.PropertyName];
object keyVal = this.GenerateEntityID(keyProperty.PropertyType, keyValTemp);
entity[keyProperty.PropertyName] = new JValue(keyVal);
string pattern = "Edm.String" == keyProperty.PropertyType ? "{0}('{1}')" : "{0}({1})";
entity[Constants.V4OdataId] = new JValue(string.Format(pattern, url, keyVal.ToString()));
string serviceNamespace = this.GetNamespace(targetShortName, "EntityType");
entity[Constants.V4OdataType] = new JValue(string.Format("#{0}.{1}", serviceNamespace, targetShortName));
}
}
}
}
return(entity);
}