1   /* Copyright 2002-2019 CS Systèmes d'Information
2    * Licensed to CS Systèmes d'Information (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.Field;
21  import org.hipparchus.RealFieldElement;
22  import org.orekit.frames.Frame;
23  import org.orekit.time.FieldAbsoluteDate;
24  
25  /**
26  ** Interface for PV coordinates providers that also support fields.
27   * @since 9.2
28   * @author Luc Maisonobe
29   */
30  public interface ExtendedPVCoordinatesProvider extends PVCoordinatesProvider {
31  
32      /** Convert to a {@link FieldPVCoordinatesProvider} with a specific type.
33       * @param <T> the type of the field elements
34       * @param field field for the argument and value
35       * @return converted function
36       */
37      default <T extends RealFieldElement<T>> FieldPVCoordinatesProvider<T> toFieldPVCoordinatesProvider(Field<T> field) {
38          return this::getPVCoordinates;
39      }
40  
41      /** Get the {@link FieldPVCoordinates} of the body in the selected frame.
42       * @param date current date
43       * @param frame the frame where to define the position
44       * @param <T> type for the field elements
45       * @return time-stamped position/velocity of the body (m and m/s)
46       */
47      <T extends RealFieldElement<T>>TimeStampedFieldPVCoordinates<T> getPVCoordinates(FieldAbsoluteDate<T> date,
48                                                                                       Frame frame);
49  
50  }