package org.apache.maven.surefire.extensions.util;
   
   /*
    * 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.
   */
  
  import org.apache.maven.surefire.extensions.CloseableDaemonThread;
  import org.apache.maven.surefire.extensions.EventHandler;
  
  import javax.annotation.Nonnull;
  import java.io.IOException;
  import java.nio.channels.ReadableByteChannel;
  import java.nio.charset.Charset;
  import java.util.Scanner;
  
  /**
   *
   */
  public final class LineConsumerThread extends CloseableDaemonThread
  {
      private final Charset encoding;
      private final ReadableByteChannel channel;
      private final EventHandler<String> eventHandler;
      private final CountdownCloseable countdownCloseable;
      private volatile boolean disabled;
  
      public LineConsumerThread( @Nonnull String threadName,
                                 @Nonnull ReadableByteChannel channel, @Nonnull EventHandler<String> eventHandler,
                                 @Nonnull CountdownCloseable countdownCloseable )
      {
          this( threadName, channel, eventHandler, countdownCloseable, Charset.defaultCharset() );
      }
  
      public LineConsumerThread( @Nonnull String threadName,
                                 @Nonnull ReadableByteChannel channel, @Nonnull EventHandler<String> eventHandler,
                                 @Nonnull CountdownCloseable countdownCloseable, @Nonnull Charset encoding )
      {
          super( threadName );
          this.channel = channel;
          this.eventHandler = eventHandler;
          this.countdownCloseable = countdownCloseable;
          this.encoding = encoding;
      }
  
      @Override
      public void run()
      {
          try ( Scanner stream = new Scanner( channel, encoding.name() );
                CountdownCloseable c = countdownCloseable; )
          {
              boolean isError = false;
              while ( stream.hasNextLine() )
              {
                  try
                  {
                      String line = stream.nextLine();
                      isError |= stream.ioException() != null;
                      if ( !isError && !disabled )
                      {
                          eventHandler.handleEvent( line );
                      }
                  }
                  catch ( IllegalStateException e )
                  {
                      isError = true;
                  }
              }
          }
          catch ( IllegalStateException | IOException e )
          {
              // not needed
          }
      }
  
      public void disable()
      {
          disabled = true;
      }
  
      @Override
      public void close() throws IOException
      {
          channel.close();
      }
 }