1   /* Copyright 2002-2025 CS GROUP
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.numerical;
18  
19  import org.orekit.attitudes.AttitudeProvider;
20  import org.orekit.propagation.SpacecraftState;
21  import org.orekit.propagation.integration.AbstractGradientConverter;
22  
23  /** Converter for states and parameters arrays.
24   * @author Luc Maisonobe
25   * @since 10.2
26   */
27  class NumericalGradientConverter extends AbstractGradientConverter {
28  
29      /** Simple constructor.
30       * @param state regular state
31       * @param freeStateParameters number of free parameters, either 3 (position) or 6 (position-velocity)
32       * @param provider provider to use if attitude needs to be recomputed
33       */
34      NumericalGradientConverter(final SpacecraftState state, final int freeStateParameters,
35                                 final AttitudeProvider provider) {
36  
37          super(freeStateParameters);
38  
39          // initialize the list with the state having 0 force model parameters
40          initStates(buildBasicGradientSpacecraftState(state, freeStateParameters, provider));
41  
42      }
43  
44  }