content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.route.parser.util;
  
  /**
   * (created at 2010-7-21)
   *
   * @author mycat
   */
  public final class Pair<K, V> {
  
      private final K key;
      private final V value;
  
      public Pair(K key, V value) {
          this.key = key;
          this.value = value;
      }
  
      public K getKey() {
          return key;
      }
  
      public V getValue() {
          return value;
      }
  
      @Override
      public String toString() {
          return "(" + key + ", " + value + ")";
      }
  
      private static final int HASH_CONST = 37;
  
      @Override
      public int hashCode() {
          int hash = 17;
          if (key == null) {
              hash += HASH_CONST;
          } else {
              hash = hash << 5 + hash << 1 + hash + key.hashCode();
          }
          if (value == null) {
              hash += HASH_CONST;
          } else {
              hash = hash << 5 + hash << 1 + hash + value.hashCode();
          }
          return hash;
      }
  
      @SuppressWarnings("rawtypes")
      @Override
      public boolean equals(Object obj) {
          if (this == obj) {
              return true;
          }
          if (!(obj instanceof Pair)) {
              return false;
          }
          Pair that = (Pair) obj;
          return isEquals(this.key, that.key) && isEquals(this.value, that.value);
      }
  
      private boolean isEquals(Object o1, Object o2) {
          if (o1 == null) {
              return o2 == null;
          }
          return o1 == o2 || o1.equals(o2);
      }
  
  }
  