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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
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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.time;
18  
19  
20  import org.junit.Assert;
21  import org.junit.Before;
22  import org.junit.Test;
23  import org.orekit.Utils;
24  import org.orekit.frames.ITRFVersion;
25  import org.orekit.utils.Constants;
26  import org.orekit.utils.IERSConventions;
27  
28  
29  public class TAIScaleTest {
30  
31      @Test
32      public void testZero() {
33          TimeScale scale = TimeScalesFactory.getTAI();
34          Assert.assertEquals("TAI", scale.toString());
35          for (double dt = -10000; dt < 10000; dt += 123.456789) {
36              AbsoluteDate date = AbsoluteDate.J2000_EPOCH.shiftedBy(dt * Constants.JULIAN_DAY);
37              Assert.assertEquals(0, scale.offsetFromTAI(date), 0);
38              DateTimeComponents components = date.getComponents(scale);
39              Assert.assertEquals(0, scale.offsetToTAI(components.getDate(), components.getTime()), 0);
40          }
41      }
42  
43      @Test
44      public void testAAS06134() {
45  
46          // this reference test has been extracted from the following paper:
47          // Implementation Issues Surrounding the New IAU Reference Systems for Astrodynamics
48          // David A. Vallado, John H. Seago, P. Kenneth Seidelmann
49          // http://www.centerforspace.com/downloads/files/pubs/AAS-06-134.pdf
50          // Note that the dUT1 here is -0.439962, whereas it is -0.4399619 in the book
51          Utils.setLoaders(IERSConventions.IERS_1996,
52                           Utils.buildEOPList(IERSConventions.IERS_1996, ITRFVersion.ITRF_2008, new double[][] {
53                               { 53098, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
54                               { 53099, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
55                               { 53100, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
56                               { 53101, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
57                               { 53102, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
58                               { 53103, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
59                               { 53104, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN },
60                               { 53105, -0.439962, 0.0015563, -0.140682, 0.333309, -0.052195, -0.003875, Double.NaN, Double.NaN }
61                           }));
62          AbsoluteDate date =
63                  new AbsoluteDate(2004, 4, 6, 7, 51, 28.386009, TimeScalesFactory.getUTC());
64          DateTimeComponents components = date.getComponents(TimeScalesFactory.getTAI());
65          Assert.assertEquals(2004,        components.getDate().getYear());
66          Assert.assertEquals(   4,        components.getDate().getMonth());
67          Assert.assertEquals(   6,        components.getDate().getDay());
68          Assert.assertEquals(   7,        components.getTime().getHour());
69          Assert.assertEquals(  52,        components.getTime().getMinute());
70          Assert.assertEquals(   0.386009, components.getTime().getSecond(), 1.0e-10);
71      }
72  
73      @Test
74      public void testDuringLeap() {
75          final TimeScale utc   = TimeScalesFactory.getUTC();
76          final TimeScale scale = TimeScalesFactory.getTAI();
77          final AbsoluteDate before = new AbsoluteDate(new DateComponents(1983, 06, 30),
78                                                       new TimeComponents(23, 59, 59),
79                                                       utc);
80          final AbsoluteDate during = before.shiftedBy(1.25);
81          Assert.assertEquals(61, utc.minuteDuration(during));
82          Assert.assertEquals(1.0, utc.getLeap(during), 1.0e-10);
83          Assert.assertEquals(60, scale.minuteDuration(during));
84          Assert.assertEquals(0.0, scale.getLeap(during), 1.0e-10);
85      }
86  
87      @Before
88      public void setUp() {
89          Utils.setDataRoot("regular-data");
90      }
91  
92  }