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// Copyright 2016 Twitter. All rights reserved.
//
// Licensed 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.twitter.heron.dsl;

import java.io.Serializable;

/**
 * Certain operations in dsl like join/reduce necessitate the concept of
 * key value pairs. This file defines a generic KeyValue class. We make
 * the KeyValue class serializable to allow it to be serialized between
 * components.
 */
public final class KeyValue implements Serializable {
  private static final long serialVersionUID = -7120757965590727554L;
  private K key;
  private V value;

  public static  KeyValue create(R k, T v) {
    return new KeyValue(k, v);
  }

  public KeyValue(K k, V v) {
    this.key = k;
    this.value = v;
  }
  public K getKey() {
    return key;
  }
  public void setKey(K k) {
    this.key = k;
  }
  public V getValue() {
    return value;
  }
  public void setValue(V v) {
    this.value = v;
  }

  @Override
  public String toString() {
    return "{ " + String.valueOf(key) + " : " + String.valueOf(value) + " }";
  }
}