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.integration;
18  
19  /** Container for additional derivatives.
20   * @see AdditionalDerivativesProvider
21   * @author Luc Maisonobe
22   * @since 11.2
23   */
24  public class CombinedDerivatives {
25  
26      /** Additional state derivatives. */
27      private final double[] additionalDerivatives;
28  
29      /** Primary state derivatives increments (may be null). */
30      private final double[] mainStateDerivativesIncrements;
31  
32      /** Simple constructor.
33       * @param additionalDerivatives additional state derivatives
34       * @param mainStateDerivativesIncrements increments related to the main state parameters
35       * (may be null if main state should not be incremented)
36       */
37      public CombinedDerivatives(final double[] additionalDerivatives,
38                                 final double[] mainStateDerivativesIncrements) {
39          this.mainStateDerivativesIncrements = mainStateDerivativesIncrements == null ?
40                                                null : mainStateDerivativesIncrements.clone();
41          this.additionalDerivatives          = additionalDerivatives.clone();
42      }
43  
44      /** Get the derivatives increments related to the main state.
45       * @return primary state derivatives increments, or null if
46       * main state should not be incremented
47       */
48      public double[] getMainStateDerivativesIncrements() {
49          return mainStateDerivativesIncrements == null ?
50                 null : mainStateDerivativesIncrements.clone();
51      }
52  
53      /** Get the derivatives related to the additional state.
54       * @return additional state derivatives
55       */
56      public double[] getAdditionalDerivatives() {
57          return additionalDerivatives.clone();
58      }
59  
60  }