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.LogResponse;
  import com.github.pgasync.io.IO;
  
  import java.nio.ByteBuffer;
  import java.nio.charset.Charset;
  
  /**
   * Base class for NoticeResponse and for ErrorResponse.
   *
   * @param <M> Specific message type.
   * @author Marat Gainullin
   */
  public abstract class LogResponseDecoder<M extends LogResponse> implements Decoder<M> {
  
      @Override
      public M read(ByteBuffer buffer, Charset encoding) {
          String level = null;
          String code = null;
          String message = null;
          for (byte type = buffer.get(); type != 0; type = buffer.get()) {
              String value = IO.getCString(buffer, encoding);
              if (type == (byte) 'S') {
                  level = value;
              } else if (type == (byte) 'C') {
                  code = value;
              } else if (type == (byte) 'M') {
                  message = value;
              }
          }
          return asMessage(level, code, message);
      }
  
      protected abstract M asMessage(String level, String code, String message);
  
  }
  