001// ***************************************************************************************************************************
002// * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements.  See the NOTICE file *
003// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
004// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
005// * with the License.  You may obtain a copy of the License at                                                              *
006// *                                                                                                                         *
007// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
008// *                                                                                                                         *
009// * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an  *
010// * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the        *
011// * specific language governing permissions and limitations under the License.                                              *
012// ***************************************************************************************************************************
013package org.apache.juneau.internal;
014
015/**
016 * Represents a simple object pair.
017 *
018 * @param <F> The first object type.
019 * @param <S> The second object type.
020 */
021public class Pair<F,S> {
022   private final F first;
023   private final S second;
024
025   /**
026    * Constructor.
027    *
028    * @param first The first object in the pair.
029    * @param second The second object in the pair.
030    */
031   public Pair(F first, S second) {
032      this.first = first;
033      this.second = second;
034   }
035
036   /**
037    * Returns the first object in the pair.
038    *
039    * @return The first object in the pair.
040    */
041   public F first() {
042      return first;
043   }
044
045   /**
046    * Returns the second object in the pair.
047    *
048    * @return The second object in the pair.
049    */
050   public S second() {
051      return second;
052   }
053
054   @Override /* Object */
055   public boolean equals(Object o) {
056      if (o instanceof Pair) {
057         Pair<?,?> p = (Pair<?,?>)o;
058         return ObjectUtils.equals(first, p.first) && ObjectUtils.equals(second, p.second);
059      }
060      return false;
061   }
062
063   @Override /* Object */
064   public int hashCode() {
065      return (first == null ? 0 : first.hashCode()) ^ (second == null ? 0 : second.hashCode());
066   }
067}