1   /* Copyright 2002-2026 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.utils.drivers;
18  
19  import java.util.List;
20  
21  import org.hipparchus.CalculusFieldElement;
22  import org.hipparchus.Field;
23  import org.hipparchus.util.MathArrays;
24  
25  /** Provider for {@link ParameterDriver parameters drivers}.
26   * @author Luc Maisonobe
27   * @author Melina Vanel
28   * @author Maxime Journot
29   * @since 11.2
30   */
31  public interface ParameterDriversProvider extends BaseParameterDriversProvider<ParameterDriver, ParameterObserver> {
32  
33      /** Get model parameters.
34       * @return model parameters
35       * @since 12.0
36       */
37      default double[] getParameters() {
38          final List<ParameterDriver> drivers = getParametersDrivers();
39          final double[] parameters = new double[drivers.size()];
40          for (int i = 0; i < drivers.size(); ++i) {
41              parameters[i] = drivers.get(i).getValue();
42          }
43          return parameters;
44      }
45  
46      /** Get model parameters.
47       * @param field field to which the elements belong
48       * @param <T> type of the elements
49       * @return model parameters
50       * @since 9.0
51       */
52      default <T extends CalculusFieldElement<T>> T[] getParameters(final Field<T> field) {
53          final List<ParameterDriver> drivers = getParametersDrivers();
54          final T[] parameters = MathArrays.buildArray(field, drivers.size());
55          for (int i = 0; i < drivers.size(); ++i) {
56              parameters[i] = field.getZero().newInstance(drivers.get(i).getValue());
57          }
58          return parameters;
59      }
60  
61  }