Avro.MapSchema.NewInstance C# (CSharp) Method

        internal static MapSchema NewInstance(JToken j, Names names)
        {
            JToken t = j["values"];
            if (null == t) throw new AvroTypeException("Map does not have 'values'");
            return new MapSchema(Schema.ParseJson(t, names));
        }

        /// <summary>
        /// Static class to return new instance of schema object
        /// </summary>
        /// <param name="jtok">JSON object</param>
        /// <param name="names">list of named schemas already read</param>
        /// <param name="encspace">enclosing namespace of the schema</param>
        /// <returns>new Schema object</returns>
        internal static Schema ParseJson(JToken jtok, SchemaNames names, string encspace)
        {
            if (null == jtok)
            {
                throw new ArgumentNullException("j", "j cannot be null.");
            }

            if (jtok.Type == JTokenType.String) // primitive schema with no 'type' property or primitive or named type of a record field
            {
                string value = (string)jtok;

                PrimitiveSchema ps = PrimitiveSchema.NewInstance(value);
                if (null != ps)
                {
                    return(ps);
                }

                NamedSchema schema = null;
                if (names.TryGetValue(value, null, encspace, out schema))
                {
                    return(schema);
                }

                throw new SchemaParseException($"Undefined name: {value} at '{jtok.Path}'");
            }

            if (jtok is JArray) // union schema with no 'type' property or union type for a record field
            {
                return(UnionSchema.NewInstance(jtok as JArray, null, names, encspace));
            }

            if (jtok is JObject) // JSON object with open/close parenthesis, it must have a 'type' property
            {
                JObject jo = jtok as JObject;

                JToken jtype = jo["type"];
                if (null == jtype)
                {
                    throw new SchemaParseException($"Property type is required at '{jtok.Path}'");
                }

                var props = Schema.GetProperties(jtok);

                if (jtype.Type == JTokenType.String)
                {
                    string type = (string)jtype;

                    if (type.Equals("array", StringComparison.Ordinal))
                    {
                        return(ArraySchema.NewInstance(jtok, props, names, encspace));
                    }
                    if (type.Equals("map", StringComparison.Ordinal))
                    {
                        return(MapSchema.NewInstance(jtok, props, names, encspace));
                    }
                    if (null != jo["logicalType"]) // logical type based on a primitive
                    {
                        return(LogicalSchema.NewInstance(jtok, props, names, encspace));
                    }

                    Schema schema = PrimitiveSchema.NewInstance((string)type, props);
                    if (null != schema)
                    {
                        return(schema);
                    }

                    return(NamedSchema.NewInstance(jo, props, names, encspace));
                }
                else if (jtype.Type == JTokenType.Array)
                {
                    return(UnionSchema.NewInstance(jtype as JArray, props, names, encspace));
                }
                else if (jtype.Type == JTokenType.Object && null != jo["logicalType"]) // logical type based on a complex type
                {
                    return(LogicalSchema.NewInstance(jtok, props, names, encspace));
                }
            }
            throw new AvroTypeException($"Invalid JSON for schema: {jtok} at '{jtok.Path}'");
        }