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.examples.pi;
  
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.List;
  import java.util.Map;
  
  import javax.validation.constraints.NotNull;
  
  import com.datatorrent.api.Context.OperatorContext;
  import com.datatorrent.api.DefaultInputPort;
  import com.datatorrent.api.DefaultOutputPort;
  import com.datatorrent.common.util.BaseOperator;
  
  /**
   * <p>An operator which converts a raw value to a named value singleton list.</p>
   * AppDataSnapshotServerMap.input accepts a List<Map<String,Object>> so we use this operator to
   * convert individual values to a singleton list of a named value
   * <p>
   * @displayNamed Value
   * @tags count
   * @since 3.2.0
   */
  public class NamedValueList<T> extends BaseOperator
  {
    @NotNull
    private String valueName;
  
    private List<Map<String, T>> valueList;
    private Map<String, T> valueMap;
  
    public final transient DefaultInputPort<T> inPort = new DefaultInputPort<T>()
    {
      @Override
      public void process(T val)
      {
        valueMap.put(valueName, val);
        outPort.emit(valueList);
      }
    };
  
    public final transient DefaultOutputPort<List<Map<String, T>>> outPort = new DefaultOutputPort<>();
  
    @Override
    public void setup(OperatorContext context)
    {
      valueMap = new HashMap<>();
      valueMap.put(valueName, null);
      valueList = Collections.singletonList(valueMap);
    }
  
    @Override
    public void teardown()
    {
    }
  
    @Override
    public void beginWindow(long windowId)
    {
    }
  
    @Override
    public void endWindow()
    {
    }
  
    public String getValueName()
    {
      return valueName;
    }
  
    public void setValueName(String name)
    {
      valueName = name;
    }
  }
  