package org.apache.maven.surefire.junitcore;
   
   /*
    * 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.report.ConsoleOutputReceiver;
  
  import java.util.Arrays;
  import java.util.Queue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  /**
   * A stream-like object that preserves ordering between stdout/stderr
   */
  public final class LogicalStream
  {
      private final Queue<Entry> output = new ConcurrentLinkedQueue<Entry>();
  
      private static final class Entry
      {
          private final boolean stdout;
  
          private final byte[] b;
  
          private final int off;
  
          private final int len;
  
          private Entry( boolean stdout, byte[] b, int off, int len )
          {
              this.stdout = stdout;
              this.b = Arrays.copyOfRange( b, off, off + len );
              this.off = 0;
              this.len = len;
          }
  
          private void writeDetails( ConsoleOutputReceiver outputReceiver )
          {
              outputReceiver.writeTestOutput( b, off, len, stdout );
          }
      }
  
      public void write( boolean stdout, byte b[], int off, int len )
      {
          if ( !isBlankLine( b, len ) )
          {
              Entry entry = new Entry( stdout, b, off, len );
              output.add( entry );
          }
      }
  
      public void writeDetails( ConsoleOutputReceiver outputReceiver )
      {
          for ( Entry entry = output.poll(); entry != null; entry = output.poll() )
          {
              entry.writeDetails( outputReceiver );
          }
      }
  
      private static boolean isBlankLine( byte[] b, int len )
      {
          return b == null || len == 0;
      }
  }