/// <summary>
/// Parses the record type.
/// </summary>
/// <param name="record">The record.</param>
/// <param name="parent">The parent schema.</param>
/// <param name="namedSchemas">The named schemas.</param>
/// <returns>
/// Schema internal representation.
/// </returns>
/// <exception cref="System.Runtime.Serialization.SerializationException">Thrown when <paramref name="record"/> can not be parsed properly.</exception>
private TypeSchema ParseRecordType(JObject record, NamedSchema parent, Dictionary<string, NamedSchema> namedSchemas)
{
var name = record.RequiredProperty<string>(Token.Name);
var nspace = this.GetNamespace(record, parent, name);
var recordName = new SchemaName(name, nspace);
var doc = record.OptionalProperty<string>(Token.Doc);
var aliases = this.GetAliases(record, recordName.Namespace);
var attributes = new NamedEntityAttributes(recordName, aliases, doc);
Dictionary<string, string> customAttributes = record.GetAttributesNotIn(StandardProperties.Record);
var result = new RecordSchema(attributes, typeof(AvroRecord), customAttributes);
namedSchemas.Add(result.FullName, result);
List<RecordField> fields = record.OptionalArrayProperty(
Token.Fields,
(field, index) =>
{
if (field.Type != JTokenType.Object)
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Property 'fields' has invalid value '{0}'.", field));
}
return this.ParseRecordField(field as JObject, result, namedSchemas, index);
});
fields.ForEach(result.AddField);
return result;
}
private List<string> GetAliases(JObject type, string @namespace)
{
List<string> aliases = type.OptionalArrayProperty(
Token.Aliases,
(alias, index) =>
{
if (alias.Type != JTokenType.String)
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Property 'aliases' has invalid value '{0}'.", alias));
}
var result = (string)alias;
if (string.IsNullOrEmpty(result))
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Alias is not allowed to be null or empty."));
}
return result;
});
return aliases
.Select(alias => string.IsNullOrEmpty(@namespace) || alias.Contains(".") ? alias : @namespace + "." + alias)
.ToList();
}
/// <summary>
/// Parses a JSON object representing an Avro enumeration to a <see cref="Microsoft.Hadoop.Avro.Schema.EnumSchema"/>.
/// </summary>
/// <param name="enumeration">The JSON token that represents the enumeration.</param>
/// <param name="parent">The parent schema.</param>
/// <param name="namedSchemas">The named schemas.</param>
/// <returns>
/// Instance of <see cref="TypeSchema" /> containing IR of the enumeration.
/// </returns>
/// <exception cref="System.Runtime.Serialization.SerializationException">Thrown when <paramref name="enumeration"/> contains invalid symbols.</exception>
private TypeSchema ParseEnumType(JObject enumeration, NamedSchema parent, Dictionary<string, NamedSchema> namedSchemas)
{
var name = enumeration.RequiredProperty<string>(Token.Name);
var nspace = this.GetNamespace(enumeration, parent, name);
var enumName = new SchemaName(name, nspace);
var doc = enumeration.OptionalProperty<string>(Token.Doc);
var aliases = this.GetAliases(enumeration, enumName.Namespace);
var attributes = new NamedEntityAttributes(enumName, aliases, doc);
List<string> symbols = enumeration.OptionalArrayProperty(
Token.Symbols,
(symbol, index) =>
{
if (symbol.Type != JTokenType.String)
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Expected an enum symbol of type string however the type of the symbol is '{0}'.", symbol.Type));
}
return (string)symbol;
});
Dictionary<string, string> customAttributes = enumeration.GetAttributesNotIn(StandardProperties.Enumeration);
var result = new EnumSchema(attributes, typeof(AvroEnum), customAttributes);
namedSchemas.Add(result.FullName, result);
symbols.ForEach(result.AddSymbol);
return result;
}
