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.conversion;
18  
19  import org.hipparchus.CalculusFieldElement;
20  import org.hipparchus.Field;
21  import org.hipparchus.ode.nonstiff.EulerFieldIntegrator;
22  import org.orekit.orbits.Orbit;
23  import org.orekit.orbits.OrbitType;
24  import org.orekit.orbits.PositionAngleType;
25  
26  /**
27   * Builder for EulerFieldIntegrator.
28   *
29   * @author Pascal Parraud
30   * @author Vincent Cucchietti
31   * @since 12.0
32   * @param <T> type of the field elements
33   */
34  public class EulerFieldIntegratorBuilder<T extends CalculusFieldElement<T>>
35          extends AbstractFixedStepFieldIntegratorBuilder<T, EulerFieldIntegrator<T>>
36          implements FieldExplicitRungeKuttaIntegratorBuilder<T> {
37  
38      /**
39       * Constructor.
40       *
41       * @param step step size (s)
42       *
43       * @see EulerFieldIntegrator
44       */
45      public EulerFieldIntegratorBuilder(final double step) {
46          super(step);
47      }
48  
49      /**
50       * Constructor using a "fielded" step.
51       * <p>
52       * <b>WARNING : Given "fielded" step must be using the same field as the one that will be used when calling
53       * {@link #buildIntegrator}</b>
54       *
55       * @param step step size (s)
56       *
57       * @see EulerFieldIntegrator
58       */
59      public EulerFieldIntegratorBuilder(final T step) {
60          super(step);
61      }
62  
63      /** {@inheritDoc} */
64      @Override
65      public EulerFieldIntegrator<T> buildIntegrator(final Field<T> field, final Orbit orbit, final OrbitType orbitType,
66                                                     final PositionAngleType angleType) {
67          return new EulerFieldIntegrator<>(field, getFieldStep(field));
68      }
69  
70      /** {@inheritDoc} */
71      @Override
72      public EulerIntegratorBuilder toODEIntegratorBuilder() {
73          return new EulerIntegratorBuilder(getStep());
74      }
75  }