1   /* Copyright 2002-2025 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  
18  package org.orekit.utils;
19  
20  import org.hipparchus.geometry.euclidean.threed.Vector3D;
21  import org.orekit.frames.Frame;
22  import org.orekit.time.AbsoluteDate;
23  
24  /**
25   * Interface for PV coordinates providers.
26   * @author Veronique Pommier
27   * <p>The PV coordinates provider interface can be used by any class used for position/velocity
28   * computation, for example celestial bodies or spacecraft position/velocity propagators,
29   * and many others...
30   * </p>
31   */
32  public interface PVCoordinatesProvider {
33  
34      /** Get the position of the body in the selected frame.
35       * @param date current date
36       * @param frame the frame where to define the position
37       * @return position of the body (m and)
38       * @since 12.0
39       */
40      default Vector3D getPosition(final AbsoluteDate date, final Frame frame) {
41          return getPVCoordinates(date, frame).getPosition();
42      }
43  
44      /** Get the velocity of the body in the selected frame.
45       * @param date current date
46       * @param frame the frame where to define the velocity
47       * @return velocity of the body (m/s)
48       * @since 13.1
49       */
50      default Vector3D getVelocity(final AbsoluteDate date, final Frame frame) {
51          return getPVCoordinates(date, frame).getVelocity();
52      }
53  
54      /** Get the {@link PVCoordinates} of the body in the selected frame.
55       * @param date current date
56       * @param frame the frame where to define the position
57       * @return time-stamped position/velocity of the body (m and m/s)
58       */
59      TimeStampedPVCoordinates getPVCoordinates(AbsoluteDate date, Frame frame);
60  
61  }