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.models.earth.troposphere;
18  
19  import org.hipparchus.CalculusFieldElement;
20  import org.orekit.bodies.FieldGeodeticPoint;
21  import org.orekit.bodies.GeodeticPoint;
22  import org.orekit.time.AbsoluteDate;
23  import org.orekit.time.FieldAbsoluteDate;
24  
25  /** Provider for {@link AzimuthalGradientCoefficients} and {@link FieldAzimuthalGradientCoefficients}.
26   * @since 12.1
27   * @author Luc Maisonobe
28   */
29  public interface AzimuthalGradientProvider {
30  
31      /** Get azimuthal asymmetry gradients.
32       * @param location location at which parameters are requested
33       * @param date date at which parameters are requested
34       * @return azimuthal asymmetry gradients or null if no gradients are available
35       */
36      AzimuthalGradientCoefficients getGradientCoefficients(GeodeticPoint location, AbsoluteDate date);
37  
38      /** Get azimuthal asymmetry gradients.
39       * @param <T> type of the field elements
40       * @param location location at which parameters are requested
41       * @param date date at which parameters are requested
42       * @return azimuthal asymmetry gradients or null if no gradients are available
43       */
44      <T extends CalculusFieldElement<T>> FieldAzimuthalGradientCoefficients<T> getGradientCoefficients(FieldGeodeticPoint<T> location,
45                                                                                                        FieldAbsoluteDate<T> date);
46  
47  }