1   /* Copyright 2002-2018 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.errors.OrekitException;
23  import org.orekit.frames.Frame;
24  import org.orekit.time.FieldAbsoluteDate;
25  
26  /**
27  ** Interface for PV coordinates providers that also support fields.
28   * @since 9.2
29   * @author Luc Maisonobe
30   */
31  public interface ExtendedPVCoordinatesProvider extends PVCoordinatesProvider {
32  
33      /** Convert to a {@link FieldPVCoordinatesProvider} with a specific type.
34       * @param <T> the type of the field elements
35       * @param field field for the argument and value
36       * @return converted function
37       */
38      default <T extends RealFieldElement<T>> FieldPVCoordinatesProvider<T> toFieldPVCoordinatesProvider(Field<T> field) {
39          return this::getPVCoordinates;
40      }
41  
42      /** Get the {@link FieldPVCoordinates} of the body in the selected frame.
43       * @param date current date
44       * @param frame the frame where to define the position
45       * @param <T> type for the field elements
46       * @return time-stamped position/velocity of the body (m and m/s)
47       * @exception OrekitException if position cannot be computed in given frame
48       */
49      <T extends RealFieldElement<T>>TimeStampedFieldPVCoordinates<T> getPVCoordinates(FieldAbsoluteDate<T> date,
50                                                                                       Frame frame)
51          throws OrekitException;
52  
53  }