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  /** Time scale with clock offset from another time scale.
22   * @author Luc Maisonobe
23   * @since 12.1
24   */
25  public class ClockTimeScale implements TimeScale {
26  
27      /** Name of the time scale. */
28      private final String name;
29  
30      /** Reference time scale. */
31      private final TimeScale reference;
32  
33      /** Clock offset model. */
34      private final transient ClockModel clockModel;
35  
36      /** Simple constructor.
37       * @param name name of the time scale
38       * @param reference reference time scale
39       * @param clockModel clock offset model
40       */
41      public ClockTimeScale(final String name,
42                            final TimeScale reference,
43                            final ClockModel clockModel) {
44          this.name       = name;
45          this.reference  = reference;
46          this.clockModel = clockModel;
47      }
48  
49      /** {@inheritDoc} */
50      @Override
51      public TimeOffset offsetFromTAI(final AbsoluteDate date) {
52          return reference.offsetFromTAI(date).add(new TimeOffset(clockModel.getOffset(date).getOffset()));
53      }
54  
55      /** {@inheritDoc} */
56      @Override
57      public <T extends CalculusFieldElement<T>> T offsetFromTAI(final FieldAbsoluteDate<T> date) {
58          return reference.offsetFromTAI(date).add(clockModel.getOffset(date).getOffset());
59      }
60  
61      /** {@inheritDoc} */
62      @Override
63      public String getName() {
64          return name;
65      }
66  
67  }