/// <summary>
/// Reads a <see cref="IPoco"/> (that can be null) from the Json reader
/// that must have been written with its type.
/// </summary>
/// <param name="this">This directory.</param>
/// <param name="reader">The Json reader.</param>
/// <param name="options">The options.</param>
/// <returns>The Poco (can be null).</returns>
public static IPoco?Read(this PocoDirectory @this, ref Utf8JsonReader reader, PocoJsonSerializerOptions?options = null)
{
if (@this == null)
{
throw new ArgumentNullException(nameof(@this));
}
if (CheckNullStart(ref reader, "expecting Json Poco array or null value."))
{
return(null);
}
if (reader.TokenType != JsonTokenType.StartArray)
{
throw new JsonException("Expecting Json Poco array.");
}
reader.Read();
string? name = reader.GetString();
IPocoFactory?f = name != null? @this.Find(name) : null;
if (f == null)
{
throw new JsonException($"Poco type '{name}' not found.");
}
reader.Read();
var p = ((IFactoryReader)f).ReadTyped(ref reader, options);
if (reader.TokenType != JsonTokenType.EndArray)
{
throw new JsonException("Expecting Json Poco end array.");
}
reader.Read();
return(p);
}
/// <summary>
/// Creates a new <see cref="IPoco"/> instance.
/// </summary>
/// <typeparam name="T">The type of the poco.</typeparam>
/// <param name="this">This directory.</param>
/// <returns>A new instance.</returns>
public static T Create <T>(this PocoDirectory @this) where T : IPoco
{
var c = @this.Find(typeof(T));
if (c == null)
{
Throw.Exception($"Unable to resolve IPoco interface '{typeof(T)}' from PocoDirectory.");
}
return((T)c.Create());
}