1   /* Copyright 2022-2025 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;
18  
19  import org.hipparchus.CalculusFieldElement;
20  
21  /** Offset clock model.
22   * @author Luc Maisonobe
23   * @since 12.1
24   */
25  public interface ClockModel {
26  
27      /** Get validity start.
28       * @return model validity start
29       */
30      AbsoluteDate getValidityStart();
31  
32      /** Get validity end.
33       * @return model validity end
34       */
35      AbsoluteDate getValidityEnd();
36  
37      /** Get the clock offset at date.
38       * @param date date at which offset is requested
39       * @return clock offset at specified date
40       */
41      ClockOffset getOffset(AbsoluteDate date);
42  
43      /** Get the clock offset at date.
44       * @param <T> type of the field elements
45       * @param date date at which offset is requested
46       * @return clock offset at specified date
47       */
48      <T extends CalculusFieldElement<T>> FieldClockOffset<T> getOffset(FieldAbsoluteDate<T> date);
49  
50  }