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.analytical;
18  
19  import org.hipparchus.analysis.differentiation.Gradient;
20  import org.orekit.propagation.integration.AbstractGradientConverter;
21  import org.orekit.utils.ParameterDriversProvider;
22  
23  /**
24   * Converter for analytical orbit propagator.
25   *
26   * @author Bryan Cazabonne
27   * @since 11.1
28   */
29  public abstract class AbstractAnalyticalGradientConverter
30      extends AbstractGradientConverter implements ParameterDriversProvider {
31  
32      /**
33       * Constructor.
34       * @param propagator analytical orbit propagator
35       * @param freeStateParameters number of free parameters
36       */
37      protected AbstractAnalyticalGradientConverter(final AbstractAnalyticalPropagator propagator,
38                                                    final int freeStateParameters) {
39          super(freeStateParameters);
40          initStates(buildBasicGradientSpacecraftState(propagator.getInitialState(), freeStateParameters,
41                                                       propagator.getAttitudeProvider()));
42  
43      }
44  
45      /**
46       * Get the converted analytical orbit propagator.
47       * @return the converted analytical orbit propagator
48       */
49      public abstract FieldAbstractAnalyticalPropagator<Gradient> getPropagator();
50  
51  }