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.FieldAbsoluteDate;
22  
23  /** Field Clock model for a clock with constant offset.
24   * @param <T> type of the field elements
25   * @author Brian Carter
26   * @since 14.0
27   * @see ConstantClockModel
28   */
29  public class ConstantFieldClockModel<T extends CalculusFieldElement<T>> extends AbstractFieldClockModel<T> {
30  
31      /** Constant offset. */
32      private final T offset;
33  
34      /**
35       * Simple constructor.
36       *
37       * @param referenceDate reference date
38       * @param offset offset value
39       */
40      public ConstantFieldClockModel(final FieldAbsoluteDate<T> referenceDate, final T offset) {
41          super(referenceDate);
42          this.offset = offset;
43      }
44  
45      /** {@inheritDoc} */
46      @Override
47      public FieldClockOffset<T> getOffset(final FieldAbsoluteDate<T> date) {
48          final T zero = date.getField().getZero();
49          return new FieldClockOffset<>(date, offset, zero, zero);
50      }
51  
52  }