/**
* @param mixed $field_data
* @param string $default_namespace namespace of enclosing schema
* @param AvroNamedSchemata &$schemata
* @returns AvroField[]
* @throws AvroSchemaParseException
*/
static function parse_fields($field_data, $default_namespace, &$schemata)
{
$fields = array();
$field_names = array();
foreach ($field_data as $index => $field) {
$name = AvroUtil::array_value($field, AvroField::FIELD_NAME_ATTR);
$type = AvroUtil::array_value($field, AvroSchema::TYPE_ATTR);
$order = AvroUtil::array_value($field, AvroField::ORDER_ATTR);
$default = null;
$has_default = false;
if (array_key_exists(AvroField::DEFAULT_ATTR, $field)) {
$default = $field[AvroField::DEFAULT_ATTR];
$has_default = true;
}
if (in_array($name, $field_names)) {
throw new AvroSchemaParseException(sprintf("Field name %s is already in use", $name));
}
$is_schema_from_schemata = false;
$field_schema = null;
if (is_string($type) && ($field_schema = $schemata->schema_by_name(new AvroName($type, null, $default_namespace)))) {
$is_schema_from_schemata = true;
} else {
$field_schema = self::subparse($type, $default_namespace, $schemata);
}
$new_field = new AvroField($name, $field_schema, $is_schema_from_schemata, $has_default, $default, $order);
$field_names[] = $name;
$fields[] = $new_field;
}
return $fields;
}
/**
* @param AvroIO $io source from which to read
* @param AvroIODatumReader $datum_reader reader that understands
* the data schema
* @throws AvroDataIOException if $io is not an instance of AvroIO
* @uses read_header()
*/
public function __construct($io, $datum_reader)
{
if (!$io instanceof AvroIO) {
throw new AvroDataIOException('io must be instance of AvroIO');
}
$this->io = $io;
$this->decoder = new AvroIOBinaryDecoder($this->io);
$this->datum_reader = $datum_reader;
$this->read_header();
$codec = AvroUtil::array_value($this->metadata, AvroDataIO::METADATA_CODEC_ATTR);
if ($codec && !AvroDataIO::is_valid_codec($codec)) {
throw new AvroDataIOException(sprintf('Uknown codec: %s', $codec));
}
$this->block_count = 0;
// FIXME: Seems unsanitary to set writers_schema here.
// Can't constructor take it as an argument?
$this->datum_reader->set_writers_schema(AvroSchema::parse($this->metadata[AvroDataIO::METADATA_SCHEMA_ATTR]));
}