/// <summary>
/// Concatenates the handlers of this projection with the specified projection handlers.
/// </summary>
/// <param name="handlers">The projection handlers to concatenate.</param>
/// <returns>A <see cref="SqlProjection"/> containing the concatenated handlers.</returns>
/// <exception cref="System.ArgumentNullException">Thrown when <paramref name="handlers"/> are <c>null</c>.</exception>
public SqlProjection Concat(SqlProjectionHandler[] handlers)
{
if (handlers == null)
{
throw new ArgumentNullException("handlers");
}
var concatenated = new SqlProjectionHandler[Handlers.Length + handlers.Length];
Handlers.CopyTo(concatenated, 0);
handlers.CopyTo(concatenated, Handlers.Length);
return(new SqlProjection(concatenated));
}
/// <summary>
/// Concatenates the handlers of this projection with the specified projection handler.
/// </summary>
/// <param name="handler">The projection handler to concatenate.</param>
/// <returns>A <see cref="SqlProjection"/> containing the concatenated handlers.</returns>
/// <exception cref="System.ArgumentNullException">Thrown when <paramref name="handler"/> is <c>null</c>.</exception>
public SqlProjection Concat(SqlProjectionHandler handler)
{
if (handler == null)
{
throw new ArgumentNullException("handler");
}
var concatenated = new SqlProjectionHandler[Handlers.Length + 1];
Handlers.CopyTo(concatenated, 0);
concatenated[Handlers.Length] = handler;
return(new SqlProjection(concatenated));
}
/// <summary>
/// Resolves the <see cref="SqlProjectionHandler">handlers</see> that match the type of the message exactly.
/// </summary>
/// <param name="handlers">The set of resolvable handlers.</param>
/// <returns>A <see cref="SqlProjectionHandlerResolver">resolver</see>.</returns>
public static SqlProjectionHandlerResolver WhenEqualToHandlerMessageType(SqlProjectionHandler[] handlers)
{
if (handlers == null)
throw new ArgumentNullException("handlers");
var cache = handlers.
GroupBy(handler => handler.Message).
ToDictionary(@group => @group.Key, @group => @group.ToArray());
return message =>
{
if(message == null)
throw new ArgumentNullException("message");
SqlProjectionHandler[] result;
return cache.TryGetValue(message.GetType(), out result) ?
result :
new SqlProjectionHandler[0];
};
}
/// <summary>
/// Resolves the <see cref="SqlProjectionHandler">handlers</see> to which the message instance is assignable.
/// </summary>
/// <param name="handlers">The set of resolvable handlers.</param>
/// <returns>A <see cref="SqlProjectionHandlerResolver">resolver</see>.</returns>
public static SqlProjectionHandlerResolver WhenAssignableToHandlerMessageType(SqlProjectionHandler[] handlers)
{
if (handlers == null)
throw new ArgumentNullException("handlers");
var cache = new ConcurrentDictionary<Type, SqlProjectionHandler[]>();
return message =>
{
if (message == null)
throw new ArgumentNullException("message");
SqlProjectionHandler[] result;
if (!cache.TryGetValue(message.GetType(), out result))
{
result = cache.GetOrAdd(message.GetType(),
Array.FindAll(handlers,
handler => handler.Message.IsInstanceOfType(message)));
}
return result;
};
}
/// <summary>
/// Resolves the <see cref="SqlProjectionHandler">handlers</see> that match the type of the message exactly.
/// </summary>
/// <param name="handlers">The set of resolvable handlers.</param>
/// <returns>A <see cref="SqlProjectionHandlerResolver">resolver</see>.</returns>
public static SqlProjectionHandlerResolver WhenEqualToHandlerMessageType(SqlProjectionHandler[] handlers)
{
return Resolve.WhenEqualToHandlerMessageType(handlers);
}