com.datatorrent.lib.converter.MapToKeyHashValuePairConverter Maven / Gradle / Ivy

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/**
 * 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 com.datatorrent.lib.converter;

import java.util.Map;
import java.util.Map.Entry;

import com.datatorrent.api.DefaultInputPort;
import com.datatorrent.api.DefaultOutputPort;
import com.datatorrent.common.util.BaseOperator;
import com.datatorrent.lib.util.KeyHashValPair;

/**
 *
 * This operator outputs key value pair for each entry in input Map
 *
 * @displayName Map to key-value pair converter
 * @category Tuple Converters
 * @tags key value
 *
 * @since 3.0.0
 */
public class MapToKeyHashValuePairConverter extends BaseOperator
{

  /**
   * Input port which accepts Map.
   */
  public final transient DefaultInputPort> input = new DefaultInputPort>()
  {
    @Override
    public void process(Map tuple)
    {
      for (Entry entry : tuple.entrySet()) {
        output.emit(new KeyHashValPair(entry.getKey(), entry.getValue()));
      }
    }
  };

  /*
   * Output port which outputs KeyValue pair for each entry in Map
   */
  public final transient DefaultOutputPort> output = new DefaultOutputPort>();
}