1   /* Copyright 2025-2026 Hawkeye 360 (HE360)
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  
18  package org.orekit.time.clocks;
19  
20  import org.hipparchus.CalculusFieldElement;
21  import org.orekit.time.AbsoluteDate;
22  import org.orekit.time.FieldAbsoluteDate;
23  
24  /** Field Clock model for a clock with constant offset.
25   * @param <T> type of the field elements
26   * @author Brian Carter
27   * @since 14.0
28   * @see ConstantClockModel
29   */
30  public class ConstantFieldClockModel<T extends CalculusFieldElement<T>> implements FieldClockModel<T> {
31  
32      /** Constant offset. */
33      private final T offset;
34  
35      /** Simple constructor.
36       * @param offset offset value
37       */
38      public ConstantFieldClockModel(final T offset) {
39          this.offset = offset;
40      }
41  
42      /** {@inheritDoc} */
43      @Override
44      public AbsoluteDate getValidityStart() {
45          return AbsoluteDate.PAST_INFINITY;
46      }
47  
48      /** {@inheritDoc} */
49      @Override
50      public AbsoluteDate getValidityEnd() {
51          return AbsoluteDate.FUTURE_INFINITY;
52      }
53  
54      /** {@inheritDoc} */
55      @Override
56      public FieldClockOffset<T> getOffset(final FieldAbsoluteDate<T> date) {
57          final T zero = date.getField().getZero();
58          return new FieldClockOffset<>(date, offset, zero, zero);
59      }
60  
61      /** {@inheritDoc} */
62      @Override
63      public ClockModel toNonField() {
64          return new ConstantClockModel(offset.getReal());
65      }
66  
67  }