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  /** Clock model for perfect clock with constant zero offset.
22   * @author Luc Maisonobe
23   * @since 12.1
24   */
25  public class PerfectClockModel implements ClockModel {
26  
27      /** {@inheritDoc} */
28      @Override
29      public AbsoluteDate getValidityStart() {
30          return AbsoluteDate.PAST_INFINITY;
31      }
32  
33      /** {@inheritDoc} */
34      @Override
35      public AbsoluteDate getValidityEnd() {
36          return AbsoluteDate.FUTURE_INFINITY;
37      }
38  
39      /** {@inheritDoc} */
40      @Override
41      public ClockOffset getOffset(final AbsoluteDate date) {
42          return new ClockOffset(date, 0, 0, 0);
43      }
44  
45      /** {@inheritDoc} */
46      @Override
47      public <T extends CalculusFieldElement<T>> FieldClockOffset<T> getOffset(final FieldAbsoluteDate<T> date) {
48          final T zero = date.getField().getZero();
49          return new FieldClockOffset<>(date, zero, zero, zero);
50      }
51  
52  }