/*
    * 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.
   */
  
  package org.apache.shardingsphere.db.protocol.postgresql.packet.command.query;
  
  import lombok.RequiredArgsConstructor;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLIdentifierPacket;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLIdentifierTag;
  import org.apache.shardingsphere.db.protocol.postgresql.packet.identifier.PostgreSQLMessagePacketType;
  import org.apache.shardingsphere.db.protocol.postgresql.payload.PostgreSQLPacketPayload;
  
  import java.util.Collection;
  
  /**
   * Row description packet for PostgreSQL.
   */
  @RequiredArgsConstructor
  public final class PostgreSQLRowDescriptionPacket extends PostgreSQLIdentifierPacket {
      
      private final Collection<PostgreSQLColumnDescription> columnDescriptions;
      
      @Override
      protected void write(final PostgreSQLPacketPayload payload) {
          payload.writeInt2(columnDescriptions.size());
          for (PostgreSQLColumnDescription each : columnDescriptions) {
              payload.writeStringNul(each.getColumnName());
              payload.writeInt4(each.getTableOID());
              payload.writeInt2(each.getColumnIndex());
              payload.writeInt4(each.getTypeOID());
              payload.writeInt2(each.getColumnLength());
              payload.writeInt4(each.getTypeModifier());
              payload.writeInt2(each.getDataFormat());
          }
      }
      
      @Override
      public PostgreSQLIdentifierTag getIdentifier() {
          return PostgreSQLMessagePacketType.ROW_DESCRIPTION;
      }
  }