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.propagation.sampling;
18  
19  import org.hipparchus.CalculusFieldElement;
20  import org.orekit.propagation.FieldSpacecraftState;
21  import org.orekit.time.FieldAbsoluteDate;
22  
23  import java.util.ArrayList;
24  import java.util.List;
25  
26  /**
27   * Step handler recording states.
28   * Automatically clears them at start of propagation.
29   *
30   * @author Romain Serra
31   * @since 13.0
32   */
33  public class FieldPropagationStepRecorder<T extends CalculusFieldElement<T>> implements FieldOrekitStepHandler<T> {
34  
35      /**
36       * Recorded times.
37       */
38      private final List<FieldSpacecraftState<T>> states;
39  
40      /**
41       * Constructor.
42       */
43      public FieldPropagationStepRecorder() {
44          this.states = new ArrayList<>();
45      }
46  
47      /**
48       * Copy the current saved steps.
49       * @return copy of steps
50       */
51      public List<FieldSpacecraftState<T>> copyStates() {
52          return new ArrayList<>(states);
53      }
54  
55      /** {@inheritDoc} */
56      @Override
57      public void init(final FieldSpacecraftState<T> s0, final FieldAbsoluteDate<T> t) {
58          FieldOrekitStepHandler.super.init(s0, t);
59          states.clear();
60      }
61  
62      /** {@inheritDoc} */
63      @Override
64      public void handleStep(final FieldOrekitStepInterpolator<T> interpolator) {
65          states.add(interpolator.getCurrentState());
66      }
67  }