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.frontend;
  
  import com.github.pgasync.io.IO;
  import com.github.pgasync.message.frontend.Execute;
  
  import java.nio.ByteBuffer;
  import java.nio.charset.Charset;
  
  /**
   * See <a href="https://www.postgresql.org/docs/11/protocol-message-formats.html">Postgres message formats</a>
   *
   * <pre>
   * Execute (F)
   *   Byte1('E')
   *       Identifies the message as an Execute command.
   *
   *   Int32
   *       Length of message contents in bytes, including self.
   *
   *   String
   *       The name of the portal to execute (an empty string selects the unnamed portal).
   *
   *   Int32
   *       Maximum number of rows to return, if portal contains a query that returns rows (ignored otherwise). Zero denotes “no limit”.
   * </pre>
   *
   * @author Marat Gainullin
   */
  public class ExecuteEncoder extends ExtendedQueryEncoder<Execute> {
  
      @Override
      public Class<Execute> getMessageType() {
          return Execute.class;
      }
  
      @Override
      protected byte getMessageId() {
          return (byte) 'E';
      }
  
      @Override
      public void writeBody(Execute msg, ByteBuffer buffer, Charset encoding) {
          IO.putCString(buffer, "", encoding); // unnamed portal
          buffer.putInt(0); // unlimited maximum rows
      }
  }
  