1   /* Copyright 2020 Exotrail
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    * Exotrail 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.forces.maneuvers.propulsion;
18  
19  import org.hipparchus.geometry.euclidean.threed.Vector3D;
20  import org.orekit.frames.Frame;
21  import org.orekit.time.AbsoluteDate;
22  import org.orekit.utils.PVCoordinatesProvider;
23  
24  /**
25   * Simple implementation of VariableThrustDirectionVector, providing a constant
26   * direction.
27   * @author Mikael Fillastre
28   * @author Andrea Fiorentino
29   * @since 10.2
30   */
31  
32  public class ConstantThrustDirectionProvider implements ThrustDirectionProvider {
33  
34      /** Constant direction. */
35      private final Vector3D direction;
36  
37      /**
38       * Constructor.
39       * @param constantDirection constant direction
40       */
41      public ConstantThrustDirectionProvider(final Vector3D constantDirection) {
42          direction = constantDirection;
43      }
44  
45      @Override
46      public Vector3D computeThrustDirection(final PVCoordinatesProvider pvProv, final AbsoluteDate date,
47                                             final Frame frame) {
48          return direction;
49      }
50  }