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 io.jafka.utils;
  
  /**
   * two elements tuple
   * 
   * @author adyliu (imxylz@gmail.com)
   * @since 1.0
   */
  public class KV<K, V> {
  
      public final K k;
  
      public final V v;
  
      public KV(K k, V v) {
          super();
          this.k = k;
          this.v = v;
      }
  
      @Override
      public int hashCode() {
          final int prime = 31;
          int result = 1;
          result = prime * result + ((k == null) ? 0 : k.hashCode());
          result = prime * result + ((v == null) ? 0 : v.hashCode());
          return result;
      }
  
      @SuppressWarnings("rawtypes")
      @Override
      public boolean equals(Object obj) {
          if (this == obj) return true;
          if (obj == null) return false;
          if (getClass() != obj.getClass()) return false;
          KV other = (KV) obj;
          if (k == null) {
              if (other.k != null) return false;
          } else if (!k.equals(other.k)) return false;
          if (v == null) {
              if (other.v != null) return false;
          } else if (!v.equals(other.v)) return false;
          return true;
      }
  
      @Override
      public String toString() {
          return String.format("KV [k=%s, v=%s]", k, v);
      }
  
      public static class StringTuple extends KV<String, String> implements Comparable<StringTuple> {
  
          public StringTuple(String k, String v) {
              super(k, v);
          }
  
          @Override
          public int compareTo(StringTuple o) {
              if (k == null || o.k == null) {
                  return 0;
              }
              int c = this.k.compareTo(o.k);
              if (c == 0) {
                  return v == null || o.v == null ? 0 : this.v.compareTo(o.v);
              }
              return c;
          }
      }
  }
  