1   /* Copyright 2002-2026 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.Serial;
20  import java.io.Serializable;
21  import java.util.Comparator;
22  
23  /** Comparator for {@link TimeStamped} instance.
24   * @see AbsoluteDate
25   * @see TimeStamped
26   * @author Luc Maisonobe
27   */
28  public class ChronologicalComparator implements Comparator<TimeStamped>, Serializable {
29  
30      /** Serializable UID. */
31      @Serial
32      private static final long serialVersionUID = 3092980292741000025L;
33  
34      /** Simple constructor.
35       */
36      public ChronologicalComparator() {
37          // nothing to do
38      }
39  
40      /** Compare two time-stamped instances.
41       * @param timeStamped1 first time-stamped instance
42       * @param timeStamped2 second time-stamped instance
43       * @return a negative integer, zero, or a positive integer as the first
44       * instance is before, simultaneous, or after the second one.
45       */
46      public int compare(final TimeStamped timeStamped1,
47                         final TimeStamped timeStamped2) {
48          return timeStamped1.getDate().compareTo(timeStamped2.getDate());
49      }
50  
51  }