content: /*
   * Licensed 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 com.github.pgasync.io.backend;
  
  import com.github.pgasync.io.Decoder;
  import com.github.pgasync.message.backend.CommandComplete;
  
  import java.nio.ByteBuffer;
  import java.nio.charset.Charset;
  
  import static com.github.pgasync.io.IO.getCString;
  
  /**
   * See <a href="www.postgresql.org/docs/9.3/static/protocol-message-formats.html">Postgres message formats</a>
   *
   * <pre>
   * CommandComplete (B)
   *  Byte1('C')
   *      Identifies the message as a command-completed response.
   *  Int32
   *      Length of message contents in bytes, including self.
   *  String
   *      The command tag. This is usually a single word that identifies which SQL command was completed.
   *      For an INSERT command, the tag is INSERT oid rows, where rows is the number of rows inserted. oid is the object ID of the inserted row if rows is 1 and the target table has OIDs; otherwise oid is 0.
   *      For a DELETE command, the tag is DELETE rows where rows is the number of rows deleted.
   *      For an UPDATE command, the tag is UPDATE rows where rows is the number of rows updated.
   *      For a SELECT or CREATE TABLE AS command, the tag is SELECT rows where rows is the number of rows retrieved.
   *      For a MOVE command, the tag is MOVE rows where rows is the number of rows the cursor's position has been changed by.
   *      For a FETCH command, the tag is FETCH rows where rows is the number of rows that have been retrieved from the cursor.
   *      For a COPY command, the tag is COPY rows where rows is the number of rows copied. (Note: the row count appears only in Postgres 8.2 and later.)
   * </pre>
   *
   * @author Antti Laisi
   */
  public class CommandCompleteDecoder implements Decoder<CommandComplete> {
  
      @Override
      public byte getMessageId() {
          return 'C';
      }
  
      @Override
      public CommandComplete read(ByteBuffer buffer, Charset encoding) {
          String tag = getCString(buffer, encoding);
          return new CommandComplete(tag);
      }
  
  }
  