///-------------------------------------------------------------------------------------------------
/// <summary>
/// An IHyperstore extension method that creates a relationship.
/// </summary>
/// <exception cref="SessionRequiredException">
/// Thrown when a Session Required error condition occurs.
/// </exception>
/// <typeparam name="T">
/// Generic type parameter.
/// </typeparam>
/// <param name="store">
/// The store to act on.
/// </param>
/// <param name="start">
/// The start.
/// </param>
/// <param name="end">
/// The end.
/// </param>
/// <param name="id">
/// (Optional) the identifier.
/// </param>
/// <returns>
/// The new relationship.
/// </returns>
///-------------------------------------------------------------------------------------------------
public static T CreateRelationship <T>(this IHyperstore store, IModelElement start, IModelElement end, Identity id = null) where T : IModelRelationship
{
Contract.Requires(store != null, "store");
Contract.Requires(start != null, "start");
Contract.Requires(end != null, "end");
if (Session.Current == null)
{
throw new SessionRequiredException();
}
var domain = start.DomainModel;
var schema = store.GetSchemaRelationship <T>();
var cmd = new AddRelationshipCommand(schema, start, end, id);
Session.Current.Execute(cmd);
return((T)cmd.Relationship);
}
///-------------------------------------------------------------------------------------------------
/// <summary>
/// Gets the relationships.
/// </summary>
/// <typeparam name="T">
/// Generic type parameter.
/// </typeparam>
/// <param name="end">
/// (Optional)
/// </param>
/// <returns>
/// An enumerator that allows foreach to be used to process the relationships in this collection.
/// </returns>
///-------------------------------------------------------------------------------------------------
public IEnumerable <T> GetRelationships <T>(IModelElement end = null) where T : IModelRelationship
{
return(GetRelationships(_store.GetSchemaRelationship <T>(), end)
.Select(rel => (T)rel));
}
