/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// ** Experimental **
// Protocol Buffers describing Beam Schemas, a portable representation for
// complex types.

syntax = "proto3";

package org.apache.beam.model.pipeline.v1;

option go_package = "pipeline_v1";
option java_package = "org.apache.beam.model.pipeline.v1";
option java_outer_classname = "SchemaApi";

message Schema {
  repeated Field fields = 1;
  string id = 2;
}

message Field {
  string name = 1;
  string description = 2;
  FieldType type = 3;
  int32 id = 4;
  int32 encoding_position = 5;
}

message FieldType {
  bool nullable = 1;
  oneof type_info {
    AtomicType atomic_type = 2;
    ArrayType array_type = 3;
    MapType map_type = 4;
    RowType row_type = 5;
    LogicalType logical_type = 6;
  }
}

enum AtomicType {
  UNSPECIFIED = 0;
  BYTE = 1;
  INT16 = 2;
  INT32 = 3;
  INT64 = 4;
  FLOAT = 5;
  DOUBLE = 6;
  STRING = 7;
  BOOLEAN = 8;
  BYTES = 9;
}

message ArrayType {
  FieldType element_type = 1;
}

message MapType {
  FieldType key_type = 1;
  FieldType value_type = 2;
}

message RowType {
  Schema schema = 1;
}

message LogicalType {
  string urn = 1;
  string args = 2;
  FieldType representation = 3;
}
