private string GetNamespace(JObject type, NamedSchema parentSchema, string name)
{
var nspace = type.OptionalProperty<string>(Token.Namespace);
if (string.IsNullOrEmpty(nspace) && !name.Contains(".") && parentSchema != null)
{
nspace = parentSchema.Namespace;
}
return nspace;
}
/// <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;
}
/// <summary>
/// Parses the record field.
/// </summary>
/// <param name="field">The field.</param>
/// <param name="parent">The parent schema.</param>
/// <param name="namedSchemas">The named schemas.</param>
/// <param name="position">The position.</param>
/// <returns>
/// Schema internal representation.
/// </returns>
/// <exception cref="System.Runtime.Serialization.SerializationException">Thrown when <paramref name="field"/> is not valid or when sort order is not valid.</exception>
private RecordField ParseRecordField(JObject field, NamedSchema parent, Dictionary<string, NamedSchema> namedSchemas, int position)
{
var name = field.RequiredProperty<string>(Token.Name);
var doc = field.OptionalProperty<string>(Token.Doc);
var order = field.OptionalProperty<string>(Token.Order);
var aliases = this.GetAliases(field, parent.FullName);
var fieldType = field[Token.Type];
if (fieldType == null)
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Record field schema '{0}' has no type.", field));
}
TypeSchema type = this.Parse(fieldType, parent, namedSchemas);
object defaultValue = null;
bool hasDefaultValue = field[Token.Default] != null;
if (hasDefaultValue)
{
var objectParser = new JsonObjectParser();
defaultValue = objectParser.Parse(type, field[Token.Default].ToString());
}
var orderValue = SortOrder.Ascending;
if (!string.IsNullOrEmpty(order))
{
if (!SortValue.ContainsKey(order.ToUpperInvariant()))
{
throw new SerializationException(
string.Format(CultureInfo.InvariantCulture, "Invalid sort order of the field '{0}'.", order));
}
orderValue = SortValue[order.ToUpperInvariant()];
}
var fieldName = new SchemaName(name);
var attributes = new NamedEntityAttributes(fieldName, aliases, doc);
return new RecordField(attributes, type, orderValue, hasDefaultValue, defaultValue, null, position);
}
/// <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;
}
