1   /* Copyright 2022-2025 Luc Maisonobe
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.CalculusFieldElement;
21  import org.orekit.frames.FieldStaticTransform;
22  import org.orekit.frames.FieldTransform;
23  import org.orekit.frames.Frame;
24  import org.orekit.frames.StaticTransform;
25  import org.orekit.frames.Transform;
26  import org.orekit.frames.TransformProvider;
27  import org.orekit.time.AbsoluteDate;
28  import org.orekit.time.FieldAbsoluteDate;
29  
30  /** Adapter from {@link ExtendedPositionProvider} to {@link TransformProvider}.
31   * <p>
32   * The transform provider is a simple translation from a defining frame such
33   * that the origin of the transformed frame corresponds to the moving point.
34   * </p>
35   * <p>
36   * This class is roughly the inverse of {@link FrameAdapter}
37   * </p>
38   * @see FrameAdapter
39   * @since 12.0
40   * @author Luc Maisonobe
41   */
42  public class ExtendedPositionProviderAdapter extends Frame {
43  
44      /** Simple constructor.
45       * @param parent parent frame (must be non-null)
46       * @param provider coordinates provider defining the position of origin of the transformed frame
47       * @param name name of the frame
48       */
49      public ExtendedPositionProviderAdapter(final Frame parent,
50                                             final ExtendedPositionProvider provider,
51                                             final String name) {
52          super(parent, new TransformProvider() {
53  
54              /** {@inheritDoc} */
55              @Override
56              public StaticTransform getStaticTransform(final AbsoluteDate date) {
57                  return StaticTransform.of(date, provider.getPosition(date, parent).negate());
58              }
59  
60              /** {@inheritDoc} */
61              @Override
62              public <T extends CalculusFieldElement<T>> FieldStaticTransform<T> getStaticTransform(final FieldAbsoluteDate<T> date) {
63                  return FieldStaticTransform.of(date, provider.getPosition(date, parent).negate());
64              }
65  
66              /** {@inheritDoc} */
67              @Override
68              public Transform getTransform(final AbsoluteDate date) {
69                  return new Transform(date, provider.getPVCoordinates(date, parent).negate());
70              }
71  
72              /** {@inheritDoc} */
73              @Override
74              public <T extends CalculusFieldElement<T>> FieldTransform<T> getTransform(final FieldAbsoluteDate<T> date) {
75                  return new FieldTransform<>(date, provider.getPVCoordinates(date, parent).negate());
76              }
77  
78          }, name);
79      }
80  
81  }