1   /* Contributed in the public domain.
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.data;
18  
19  import org.orekit.bodies.LazyLoadedCelestialBodies;
20  import org.orekit.errors.OrekitException;
21  import org.orekit.errors.OrekitMessages;
22  import org.orekit.forces.gravity.potential.LazyLoadedGravityFields;
23  import org.orekit.frames.LazyLoadedFrames;
24  import org.orekit.models.earth.LazyLoadedGeoMagneticFields;
25  import org.orekit.time.AbsoluteDate;
26  import org.orekit.time.LazyLoadedTimeScales;
27  
28  /**
29   * A data context that always throws a runtime exception when it's methods are used. Can
30   * be useful for determining if the default data context is used. E.g. {@code
31   * DataContext.setDefault(new ExceptionalDataContext());}. The following classes have
32   * static fields that are initialized using the default data context:
33   *
34   * <ul>
35   *     <li>{@link AbsoluteDate}
36   * </ul>
37   *
38   * @author Evan Ward
39   * @see DataContext#setDefault(LazyLoadedDataContext)
40   * @since 10.1
41   */
42  public class ExceptionalDataContext extends LazyLoadedDataContext implements DataContext {
43  
44      /** Empty constructor.
45       * <p>
46       * This constructor is not strictly necessary, but it prevents spurious
47       * javadoc warnings with JDK 18 and later.
48       * </p>
49       * @since 12.0
50       */
51      public ExceptionalDataContext() {
52          // nothing to do
53      }
54  
55      @Override
56      public LazyLoadedTimeScales getTimeScales() {
57          throw new OrekitException(OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
58      }
59  
60      @Override
61      public LazyLoadedFrames getFrames() {
62          throw new OrekitException(OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
63      }
64  
65      @Override
66      public LazyLoadedCelestialBodies getCelestialBodies() {
67          throw new OrekitException(OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
68      }
69  
70      @Override
71      public LazyLoadedGravityFields getGravityFields() {
72          throw new OrekitException(OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
73      }
74  
75      @Override
76      public LazyLoadedGeoMagneticFields getGeoMagneticFields() {
77          throw new OrekitException(OrekitMessages.EXCEPTIONAL_DATA_CONTEXT);
78      }
79  
80  }