package org.apache.maven.plugin.surefire.booterclient.output;
   
   /*
    * 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 java.io.IOException;
  import java.util.Queue;
  import java.util.concurrent.ConcurrentLinkedQueue;
  
  final class MultipleFailureException
          extends IOException
  {
      private final Queue<Throwable> exceptions = new ConcurrentLinkedQueue<>();
  
      void addException( Throwable exception )
      {
          exceptions.add( exception );
      }
  
      boolean hasNestedExceptions()
      {
          return !exceptions.isEmpty();
      }
  
      @Override
      public String getLocalizedMessage()
      {
          StringBuilder messages = new StringBuilder();
          for ( Throwable exception : exceptions )
          {
              if ( messages.length() != 0 )
              {
                  messages.append( '\n' );
              }
              String message = exception.getLocalizedMessage();
              messages.append( message == null ? exception.toString() : message );
          }
          return messages.toString();
      }
  
      @Override
      public String getMessage()
      {
          StringBuilder messages = new StringBuilder();
          for ( Throwable exception : exceptions )
          {
              if ( messages.length() != 0 )
              {
                  messages.append( '\n' );
              }
              String message = exception.getMessage();
              messages.append( message == null ? exception.toString() : message );
          }
          return messages.toString();
      }
  }