1   /* Copyright 2022-2025 Romain Serra
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.control.indirect.shooting.boundary;
18  
19  import org.orekit.orbits.Orbit;
20  
21  /**
22   * Defines two-point boundary values for indirect shooting methods with Cartesian coordinates.
23   * This class represents the case where the initial and terminal times are fixed as well as the full
24   * Cartesian coordinates (position and velocity vectors in some frame), using {@link org.orekit.orbits.Orbit} as data holder.
25   * <br>
26   * The terminal condition can be anterior in time to the initial one, it just means that the shooting method will perform backward propagation.
27   * Also note that any acceleration vector passed in the {@link org.orekit.orbits.Orbit} is ignored.
28   *
29   * @author Romain Serra
30   * @since 12.2
31   * @see FixedTimeCartesianBoundaryStates
32   */
33  public class FixedTimeBoundaryOrbits {
34  
35      /** Initial orbit (with date and frame). */
36      private final Orbit initialOrbit;
37  
38      /** Terminal orbit (with date and frame). */
39      private final Orbit terminalOrbit;
40  
41      /**
42       * Constructor.
43       * @param initialOrbit initial condition
44       * @param terminalOrbit terminal condition
45       */
46      public FixedTimeBoundaryOrbits(final Orbit initialOrbit,
47                                     final Orbit terminalOrbit) {
48          this.initialOrbit = initialOrbit;
49          this.terminalOrbit = terminalOrbit;
50      }
51  
52      /**
53       * Getter for the initial condition.
54       * @return initial condition
55       */
56      public Orbit getInitialOrbit() {
57          return initialOrbit;
58      }
59  
60      /**
61       * Getter for the terminal condition.
62       * @return terminal condition
63       */
64      public Orbit getTerminalOrbit() {
65          return terminalOrbit;
66      }
67  }