/// <summary>
/// Creates a new sub entity and assigns the parent entity specified in the query strings.
/// </summary>
/// <returns></returns>
public override IEntity Create()
{
IEntity entity = null;
using (LogGroup logGroup = LogGroup.Start("Preparing the form to create a new sub entity.", NLog.LogLevel.Debug))
{
if (EnsureAuthorised())
{
Guid parentID = Guid.Empty;
string parentUniqueKey = String.Empty;
if (QueryStrings.Available)
{
parentID = QueryStrings.GetID("Parent");
parentUniqueKey = QueryStrings.GetUniqueKey("Parent");
}
else
{
throw new InvalidOperationException("Query strings aren't available. Provide parent ID or parent unique key manually.");
}
LogWriter.Debug("Parent ID: " + parentID);
LogWriter.Debug("Parent unique key: " + parentUniqueKey);
entity = Create(parentID, parentUniqueKey);
}
}
return(entity);
}
/// <summary>
/// Displays the page for viewing an entity.
/// </summary>
public virtual void View <T>()
where T : IEntity
{
Guid id = QueryStrings.GetID(Command.TypeName);
string uniqueKey = QueryStrings.GetUniqueKey(Command.TypeName);
if (id != Guid.Empty)
{
View <T>(id);
}
else if (uniqueKey != String.Empty)
{
View <T>(uniqueKey);
}
else
{
throw new InvalidOperationException("Cannot view entity. No identifier found.");
}
}
/// <summary>
/// Loads the entity specified by the query string and prepares it for viewing.
/// </summary>
/// <returns>The entity specified by the query string.</returns>
public virtual T PrepareView <T>()
where T : IEntity
{
Guid goalID = QueryStrings.GetID(Command.TypeName);
string goalKey = QueryStrings.GetUniqueKey(Command.TypeName);
if (goalID != Guid.Empty)
{
return((T)LoadEntity <T>(goalID));
}
else if (goalKey != String.Empty)
{
return((T)LoadEntity <T>(goalKey));
}
else
{
throw new InvalidOperationException("Cannot find entity ID or unique key in query string.");
}
}
/// <summary>
/// Loads the entity specified by the query string.
/// </summary>
/// <returns></returns>
public virtual T Load <T>()
where T : IEntity
{
T entity = default(T);
using (LogGroup logGroup = LogGroup.Start("Loading the entity specified in the query string.", NLog.LogLevel.Debug))
{
Guid id = QueryStrings.GetID(typeof(T).Name);
string uniqueKey = QueryStrings.GetUniqueKey(typeof(T).Name);
LogWriter.Debug("Entity ID: " + id.ToString());
LogWriter.Debug("Unique key: " + uniqueKey);
if (id != Guid.Empty)
{
entity = Retriever.Retrieve <T>(id);
}
else if (uniqueKey != String.Empty)
{
entity = Retriever.Retrieve <T>(uniqueKey);
}
else
{
throw new Exception("No ID or unique key found in the URL.");
}
if (entity == null)
{
LogWriter.Debug("Entity: [null]");
}
else
{
LogWriter.Debug("Entity: " + entity.GetType().FullName);
}
}
return(entity);
}
/// <summary>
/// Retrieves the unique key of the entity being edited.
/// </summary>
/// <returns></returns>
public virtual string GetUniqueKey()
{
return(QueryStrings.GetUniqueKey(Command.TypeName));
}