1   /* Copyright 2002-2025 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    *
9    *   http://www.apache.org/licenses/LICENSE-2.0
10   *
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  package org.orekit.time;
18  
19  import java.io.Serializable;
20  import java.util.Comparator;
21  
22  /** Comparator for {@link TimeStamped} instance.
23   * @see AbsoluteDate
24   * @see TimeStamped
25   * @author Luc Maisonobe
26   */
27  public class ChronologicalComparator implements Comparator<TimeStamped>, Serializable {
28  
29      /** Serializable UID. */
30      private static final long serialVersionUID = 3092980292741000025L;
31  
32      /** Simple constructor.
33       */
34      public ChronologicalComparator() {
35          // nothing to do
36      }
37  
38      /** Compare two time-stamped instances.
39       * @param timeStamped1 first time-stamped instance
40       * @param timeStamped2 second time-stamped instance
41       * @return a negative integer, zero, or a positive integer as the first
42       * instance is before, simultaneous, or after the second one.
43       */
44      public int compare(final TimeStamped timeStamped1,
45                         final TimeStamped timeStamped2) {
46          return timeStamped1.getDate().compareTo(timeStamped2.getDate());
47      }
48  
49  }