1   /* Copyright 2002-2020 CS GROUP
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.attitudes;
18  
19  import org.hipparchus.RealFieldElement;
20  import org.orekit.frames.Frame;
21  import org.orekit.time.AbsoluteDate;
22  import org.orekit.time.FieldAbsoluteDate;
23  import org.orekit.utils.FieldPVCoordinatesProvider;
24  import org.orekit.utils.PVCoordinatesProvider;
25  
26  
27  /** This interface represents an attitude provider model set.
28   * <p>An attitude provider provides a way to compute an {@link Attitude Attitude}
29   * from an date and position-velocity local provider.</p>
30   * @author V&eacute;ronique Pommier-Maurussane
31   */
32  public interface AttitudeProvider {
33  
34      /** Compute the attitude corresponding to an orbital state.
35       * @param pvProv local position-velocity provider around current date
36       * @param date current date
37       * @param frame reference frame from which attitude is computed
38       * @return attitude attitude on the specified date and position-velocity state
39       */
40      Attitude getAttitude(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame);
41  
42      /** Compute the attitude corresponding to an orbital state.
43       * @param pvProv local position-velocity provider around current date
44       * @param date current date
45       * @param frame reference frame from which attitude is computed
46       * @param <T> type of the field elements
47       * @return attitude attitude on the specified date and position-velocity state
48       * @since 9.0
49       */
50      <T extends RealFieldElement<T>> FieldAttitude<T> getAttitude(FieldPVCoordinatesProvider<T> pvProv,
51                                                                   FieldAbsoluteDate<T> date,
52                                                                   Frame frame);
53  }