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 com.clearspring.analytics.util;
  
  public class Pair<T1, T2> {
  
      public final T1 left;
      public final T2 right;
  
      public Pair(T1 left, T2 right) {
          this.left = left;
          this.right = right;
      }
  
      @Override
      public final int hashCode() {
          int hashCode = 31 + (left == null ? 0 : left.hashCode());
          return 31 * hashCode + (right == null ? 0 : right.hashCode());
      }
  
      @Override
      public final boolean equals(Object o) {
          if (!(o instanceof Pair)) {
              return false;
          }
          Pair that = (Pair) o;
          // handles nulls properly
          return equal(left, that.left) && equal(right, that.right);
      }
  
      // From Apache Licensed guava:
      private boolean equal(Object a, Object b) {
          return a == b || (a != null && a.equals(b));
      }
  
  
      @Override
      public String toString() {
          return "(" + left + "," + right + ")";
      }
  
      public static <X, Y> Pair<X, Y> create(X x, Y y) {
          return new Pair<X, Y>(x, y);
      }
  }
  