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.gnss;
18  
19  import org.orekit.time.TimeScale;
20  import org.orekit.time.TimeScales;
21  
22  /** Time systems used in navigation files.
23   *
24   * @author Thomas Neidhart
25   * @author Evan Ward
26   * @author Thomas Paulet
27   * @since 11.0
28   */
29  public interface TimeSystem {
30  
31      /** Get the 3 letters key of the time system.
32       * @return 3 letters key
33       * @since 12.0
34       */
35      String getKey();
36  
37      /** Get the two letters code.
38       * @return two letters code (may be null for non-GNSS time systems)
39       * @since 12.2
40       */
41      String getTwoLettersCode();
42  
43      /** Get the one letter code.
44       * @return one letter code (may be null for non-GNSS time systems)
45       * @since 12.2
46       */
47      String getOneLetterCode();
48  
49      /** Get the time scale corresponding to time system.
50       * @param timeScales the set of time scales to use
51       * @return the time scale corresponding to time system in the set of time scales
52       */
53      TimeScale getTimeScale(TimeScales timeScales);
54  
55  }