1   /* Copyright 2022-2026 Thales Alenia Space
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.clocks;
18  
19  import org.hipparchus.CalculusFieldElement;
20  import org.orekit.time.AbsoluteDate;
21  import org.orekit.time.FieldAbsoluteDate;
22  
23  /** Offset clock model.
24   * @author Luc Maisonobe
25   * @since 12.1
26   */
27  public interface ClockModel {
28  
29      /** Get validity start.
30       * @return model validity start
31       */
32      AbsoluteDate getValidityStart();
33  
34      /** Get validity end.
35       * @return model validity end
36       */
37      AbsoluteDate getValidityEnd();
38  
39      /** Get the clock offset at date.
40       * @param date date at which offset is requested
41       * @return clock offset at specified date
42       */
43      ClockOffset getOffset(AbsoluteDate date);
44  
45      /** Get the clock offset at date.
46       * @param <T> type of the field elements
47       * @param date date at which offset is requested
48       * @return clock offset at specified date
49       */
50      <T extends CalculusFieldElement<T>> FieldClockOffset<T> getOffset(FieldAbsoluteDate<T> date);
51  
52  }