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