content: /**
   * 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.
   */
  package org.apache.apex.malhar.stream.sample;
  
  import java.util.HashMap;
  import java.util.LinkedList;
  import java.util.List;
  import java.util.Map;
  
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.api.annotation.OutputPortFieldAnnotation;
  import com.datatorrent.common.util.BaseOperator;
  
  /**
   * A helper class for assertion of results collected
   */
  public class TupleCollector<T> extends BaseOperator
  {
  
    public static volatile Map<String, List<?>> results = new HashMap<>();
  
    public final transient CollectorInputPort<T> inputPort = new CollectorInputPort<>(this);
  
    @OutputPortFieldAnnotation(optional = true)
    public final transient DefaultOutputPort<T> outputPort = new DefaultOutputPort<>();
  
    public String id = "";
  
    public static class CollectorInputPort<T> extends DefaultInputPort<T>
    {
      TupleCollector ownerOperator;
  
      List<T> list;
  
      public CollectorInputPort(TupleCollector ownerOperator)
      {
        super();
        this.ownerOperator = ownerOperator;
      }
  
      @Override
      @SuppressWarnings("unchecked")
      public void process(T tuple)
      {
        list.add(tuple);
        ownerOperator.outputPort.emit(tuple);
      }
  
      @Override
      public void setConnected(boolean flag)
      {
        if (flag) {
          results.put(ownerOperator.id, list = new LinkedList<>());
        }
      }
    }
  
  
  
  
  
  
  
  }
  