BulletinBFilesLoader.java

  1. /* Copyright 2002-2019 CS Systèmes d'Information
  2.  * Licensed to CS Systèmes d'Information (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.frames;

  19. import java.io.BufferedReader;
  20. import java.io.IOException;
  21. import java.io.InputStream;
  22. import java.io.InputStreamReader;
  23. import java.util.ArrayList;
  24. import java.util.HashMap;
  25. import java.util.List;
  26. import java.util.Map;
  27. import java.util.SortedSet;
  28. import java.util.regex.Matcher;
  29. import java.util.regex.Pattern;

  31. import org.hipparchus.util.FastMath;
  32. import org.orekit.data.DataLoader;
  33. import org.orekit.data.DataProvidersManager;
  34. import org.orekit.errors.OrekitException;
  35. import org.orekit.errors.OrekitMessages;
  36. import org.orekit.time.AbsoluteDate;
  37. import org.orekit.time.DateComponents;
  38. import org.orekit.time.Month;
  39. import org.orekit.time.TimeScalesFactory;
  40. import org.orekit.utils.Constants;
  41. import org.orekit.utils.IERSConventions;

  43. /** Loader for bulletin B files.
  44.  * <p>Bulletin B files contain {@link EOPEntry
  45.  * Earth Orientation Parameters} for a few months periods.
  46.  * They correspond to finalized data, suitable for long term
  47.  * a posteriori analysis.</p>
  48.  * <p>The bulletin B files are recognized thanks to their base names,
  49.  * which must match one of the patterns <code>bulletinb_IAU2000-###.txt</code>,
  50.  * <code>bulletinb_IAU2000.###</code>, <code>bulletinb-###.txt</code> or
  51.  * <code>bulletinb.###</code> (or the same ending with <code>.gz</code>
  52.  * for gzip-compressed files) where # stands for a digit character.</p>
  53.  * <p>
  54.  * Starting with bulletin B 252 published in February 2009, buletins B are
  55.  * written in a format containing nutation corrections for both the
  56.  * new IAU2000 nutation model as dx, dy entries in its section 1 and nutation
  57.  * corrections for the old IAU1976 nutation model as dPsi, dEpsilon entries in
  58.  * its section 2. These bulletins are available from IERS <a
  59.  * href="ftp://ftp.iers.org/products/eop/bulletinb/format_2009/">
  60.  *  FTP site</a>. They are also available with exactly the same content
  61.  * (but a different naming convention) from <a
  62.  * href="http://hpiers.obspm.fr/eoppc/bul/bulb_new/">Paris-Meudon
  63.  * observatory site</a>.
  64.  * </p>
  65.  * <p>
  66.  * Ending with bulletin B 263 published in January 2010, bulletins B were
  67.  * written in a format containing only one type of nutation corrections in its
  68.  * section 1, either for new IAU2000 nutation model as dx, dy entries or the old
  69.  * IAU1976 nutation model as dPsi, dEpsilon entries, depending on the file (a pair of
  70.  * files with different name was published each month between March 2003 and January 2010).
  71.  * </p>
  72.  * <p>
  73.  * This class handles both the old and the new format.
  74.  * </p>
  75.  * <p>
  76.  * This class is immutable and hence thread-safe
  77.  * </p>
  78.  * @author Luc Maisonobe
  79.  */
  80. class BulletinBFilesLoader implements EOPHistoryLoader {

  82.     /** Conversion factor. */
  83.     private static final double MILLI_ARC_SECONDS_TO_RADIANS = Constants.ARC_SECONDS_TO_RADIANS / 1000;

  85.     /** Conversion factor. */
  86.     private static final double MILLI_SECONDS_TO_SECONDS = 1.e-3;

  88.     /** Section 1 header pattern. */
  89.     private static final Pattern SECTION_1_HEADER;

  91.     /** Section 2 header pattern for old format. */
  92.     private static final Pattern SECTION_2_HEADER_OLD;

  94.     /** Section 3 header pattern. */
  95.     private static final Pattern SECTION_3_HEADER;

  97.     /** Pattern for line introducing the final bulletin B values. */
  98.     private static final Pattern FINAL_VALUES_START;

  100.     /** Pattern for line introducing the bulletin B preliminary extension. */
  101.     private static final Pattern FINAL_VALUES_END;

  103.     /** Data line pattern in section 1 (old format). */
  104.     private static final Pattern SECTION_1_DATA_OLD_FORMAT;

  106.     /** Data line pattern in section 2. */
  107.     private static final Pattern SECTION_2_DATA_OLD_FORMAT;

  109.     /** Data line pattern in section 1 (new format). */
  110.     private static final Pattern SECTION_1_DATA_NEW_FORMAT;

  112.     /** Data line pattern in section 3 (new format). */
  113.     private static final Pattern SECTION_3_DATA_NEW_FORMAT;

  115.     static {

  117.         // the section headers lines in the old bulletin B monthly data files have
  118.         // the following form (the indentation discrepancy for section 6 is really
  119.         // present in the available files):
  120.         // 1 - EARTH ORIENTATION PARAMETERS (IERS evaluation).
  121.         // either
  122.         // 2 - SMOOTHED VALUES OF x, y, UT1, D, DPSI, DEPSILON (IERS EVALUATION)
  123.         // or
  124.         // 2 - SMOOTHED VALUES OF x, y, UT1, D, dX, dY (IERS EVALUATION)
  125.         // 3 - NORMAL VALUES OF THE EARTH ORIENTATION PARAMETERS AT FIVE-DAY INTERVALS
  126.         // 4 - DURATION OF THE DAY AND ANGULAR VELOCITY OF THE EARTH (IERS evaluation).
  127.         // 5 - INFORMATION ON TIME SCALES
  128.         //       6 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES
  129.         //
  130.         // the section headers lines in the new bulletin B monthly data files have
  131.         // the following form:
  132.         // 1 - DAILY FINAL VALUES OF  x, y, UT1-UTC, dX, dY
  133.         // 2 - DAILY FINAL VALUES OF CELESTIAL POLE OFFSETS dPsi1980 & dEps1980
  134.         // 3 - EARTH ANGULAR VELOCITY : DAILY FINAL VALUES OF LOD, OMEGA AT 0hUTC
  135.         // 4 - INFORMATION ON TIME SCALES
  136.         // 5 - SUMMARY OF CONTRIBUTED EARTH ORIENTATION PARAMETERS SERIES
  137.         SECTION_1_HEADER     = Pattern.compile("^ +1 - (\\p{Upper}+) \\p{Upper}+ \\p{Upper}+.*");
  138.         SECTION_2_HEADER_OLD = Pattern.compile("^ +2 - SMOOTHED \\p{Upper}+ \\p{Upper}+.*((?:DPSI, DEPSILON)|(?:dX, dY)).*");
  139.         SECTION_3_HEADER     = Pattern.compile("^ +3 - \\p{Upper}+ \\p{Upper}+ \\p{Upper}+.*");

  141.         // the markers bracketing the final values in section 1 in the old bulletin B
  142.         // monthly data files have the following form:
  143.         //
  144.         //  Final Bulletin B values.
  145.         //   ...
  146.         //  Preliminary extension, to be updated weekly in Bulletin A and monthly
  147.         //  in Bulletin B.
  148.         //
  149.         // the markers bracketing the final values in section 1 in the new bulletin B
  150.         // monthly data files have the following form:
  151.         //
  152.         //  Final values
  153.         //   ...
  154.         //  Preliminary extension
  155.         //
  156.         FINAL_VALUES_START = Pattern.compile("^\\p{Blank}+Final( Bulletin B)? values.*");
  157.         FINAL_VALUES_END   = Pattern.compile("^\\p{Blank}+Preliminary extension.*");

  159.         // the data lines in the old bulletin B monthly data files have the following form:
  160.         // in section 1:
  161.         // AUG   1  55044  0.22176 0.49302  0.231416  -33.768584   -69.1    -8.9
  162.         // AUG   6  55049  0.23202 0.48003  0.230263  -33.769737   -69.5    -8.5
  163.         // in section 2:
  164.         // AUG   1   55044  0.22176  0.49302  0.230581 -0.835  -0.310  -69.1   -8.9
  165.         // AUG   2   55045  0.22395  0.49041  0.230928 -0.296  -0.328  -69.5   -8.9
  166.         //
  167.         // the data lines in the new bulletin B monthly data files have the following form:
  168.         // in section 1:
  169.         // 2009   8   2   55045  223.954  490.410  230.9277    0.214 -0.056    0.008    0.009    0.0641  0.048  0.121
  170.         // 2009   8   3   55046  225.925  487.700  231.2186    0.300 -0.138    0.010    0.012    0.0466  0.099  0.248
  171.         // 2009   8   4   55047  227.931  485.078  231.3929    0.347 -0.231    0.019    0.023    0.0360  0.099  0.249
  172.         // 2009   8   5   55048  230.016  482.445  231.4601    0.321 -0.291    0.025    0.028    0.0441  0.095  0.240
  173.         // 2009   8   6   55049  232.017  480.026  231.3619    0.267 -0.273    0.025    0.029    0.0477  0.038  0.095
  174.         // in section 2:
  175.         // 2009   8   2   55045   -69.474    -8.929     0.199     0.121
  176.         // 2009   8   3   55046   -69.459    -9.016     0.250     0.248
  177.         // 2009   8   4   55047   -69.401    -9.039     0.250     0.249
  178.         // 2009   8   5   55048   -69.425    -8.864     0.247     0.240
  179.         // 2009   8   6   55049   -69.510    -8.539     0.153     0.095
  180.         // in section 3:
  181.         // 2009   8   2   55045 -0.3284  0.0013  15.04106723584    0.00000000023
  182.         // 2009   8   3   55046 -0.2438  0.0013  15.04106722111    0.00000000023
  183.         // 2009   8   4   55047 -0.1233  0.0013  15.04106720014    0.00000000023
  184.         // 2009   8   5   55048  0.0119  0.0013  15.04106717660    0.00000000023
  185.         // 2009   8   6   55049  0.1914  0.0013  15.04106714535    0.00000000023
  186.         final StringBuilder builder = new StringBuilder("^\\p{Blank}+(?:");
  187.         for (final Month month : Month.values()) {
  188.             builder.append(month.getUpperCaseAbbreviation());
  189.             builder.append('|');
  190.         }
  191.         builder.delete(builder.length() - 1, builder.length());
  192.         builder.append(")");
  193.         final String integerPattern      = "[-+]?\\p{Digit}+";
  194.         final String realPattern         = "[-+]?(?:(?:\\p{Digit}+(?:\\.\\p{Digit}*)?)|(?:\\.\\p{Digit}+))(?:[eE][-+]?\\p{Digit}+)?";
  195.         final String monthNameField      = builder.toString();
  196.         final String ignoredIntegerField = "\\p{Blank}*" + integerPattern;
  197.         final String storedIntegerField  = "\\p{Blank}*(" + integerPattern + ")";
  198.         final String mjdField            = "\\p{Blank}+(\\p{Digit}\\p{Digit}\\p{Digit}\\p{Digit}\\p{Digit})";
  199.         final String storedRealField     = "\\p{Blank}+(" + realPattern + ")";
  200.         final String ignoredRealField    = "\\p{Blank}+" + realPattern;
  201.         final String finalBlanks         = "\\p{Blank}*$";
  202.         SECTION_1_DATA_OLD_FORMAT = Pattern.compile(monthNameField + ignoredIntegerField + mjdField +
  203.                                                     ignoredRealField + ignoredRealField + ignoredRealField +
  204.                                                     ignoredRealField + ignoredRealField + ignoredRealField +
  205.                                                     finalBlanks);
  206.         SECTION_2_DATA_OLD_FORMAT = Pattern.compile(monthNameField + ignoredIntegerField + mjdField +
  207.                                                     storedRealField  + storedRealField  + storedRealField +
  208.                                                     ignoredRealField +
  209.                                                     storedRealField + storedRealField + storedRealField +
  210.                                                     finalBlanks);
  211.         SECTION_1_DATA_NEW_FORMAT = Pattern.compile(storedIntegerField + storedIntegerField + storedIntegerField + mjdField +
  212.                                                     storedRealField + storedRealField + storedRealField +
  213.                                                     storedRealField + storedRealField + ignoredRealField + ignoredRealField +
  214.                                                     ignoredRealField + ignoredRealField + ignoredRealField +
  215.                                                     finalBlanks);
  216.         SECTION_3_DATA_NEW_FORMAT = Pattern.compile(ignoredIntegerField + ignoredIntegerField + ignoredIntegerField + mjdField +
  217.                                                     storedRealField +
  218.                                                     ignoredRealField + ignoredRealField + ignoredRealField +
  219.                                                     finalBlanks);

  221.     }

  223.     /** Regular expression for supported files names. */
  224.     private final String supportedNames;

  226.     /** Build a loader for IERS bulletins B files.
  227.     * @param supportedNames regular expression for supported files names
  228.     */
  229.     BulletinBFilesLoader(final String supportedNames) {
  230.         this.supportedNames = supportedNames;
  231.     }

  233.     /** {@inheritDoc} */
  234.     public void fillHistory(final IERSConventions.NutationCorrectionConverter converter,
  235.                             final SortedSet<EOPEntry> history) {
  236.         final Parser parser = new Parser(converter);
  237.         DataProvidersManager.getInstance().feed(supportedNames, parser);
  238.         history.addAll(parser.history);
  239.     }

  241.     /** Internal class performing the parsing. */
  242.     private static class Parser implements DataLoader {

  244.         /** Converter for nutation corrections. */
  245.         private final IERSConventions.NutationCorrectionConverter converter;

  247.         /** Configuration for ITRF versions. */
  248.         private final ITRFVersionLoader itrfVersionLoader;

  250.         /** ITRF version configuration. */
  251.         private ITRFVersionLoader.ITRFVersionConfiguration configuration;

  253.         /** History entries. */
  254.         private final List<EOPEntry> history;

  256.         /** Map for fields read in different sections. */
  257.         private final Map<Integer, double[]> fieldsMap;

  259.         /** Current line number. */
  260.         private int lineNumber;

  262.         /** Current line. */
  263.         private String line;

  265.         /** Start of final data. */
  266.         private int mjdMin;

  268.         /** End of final data. */
  269.         private int mjdMax;

  271.         /** Simple constructor.
  272.          * @param converter converter to use
  273.          */
  274.         Parser(final IERSConventions.NutationCorrectionConverter converter) {
  275.             this.converter         = converter;
  276.             this.itrfVersionLoader = new ITRFVersionLoader(ITRFVersionLoader.SUPPORTED_NAMES);
  277.             this.history           = new ArrayList<EOPEntry>();
  278.             this.fieldsMap         = new HashMap<Integer, double[]>();
  279.             this.lineNumber        = 0;
  280.             this.mjdMin            = Integer.MAX_VALUE;
  281.             this.mjdMax            = Integer.MIN_VALUE;
  282.         }

  284.         /** {@inheritDoc} */
  285.         public boolean stillAcceptsData() {
  286.             return true;
  287.         }

  289.         /** {@inheritDoc} */
  290.         public void loadData(final InputStream input, final String name)
  291.             throws IOException {

  293.             configuration = null;

  295.             // set up a reader for line-oriented bulletin B files
  296.             final BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));

  298.             // reset parse info to start new file (do not clear history!)
  299.             fieldsMap.clear();
  300.             lineNumber = 0;
  301.             mjdMin     = Integer.MAX_VALUE;
  302.             mjdMax     = Integer.MIN_VALUE;

  304.             // skip header up to section 1 and check if we are parsing an old or new format file
  305.             final Matcher section1Matcher = seekToLine(SECTION_1_HEADER, reader, name);
  306.             final boolean isOldFormat = "EARTH".equals(section1Matcher.group(1));

  308.             if (isOldFormat) {

  310.                 // extract MJD bounds for final data from section 1
  311.                 loadMJDBoundsOldFormat(reader, name);

  313.                 final Matcher section2Matcher = seekToLine(SECTION_2_HEADER_OLD, reader, name);
  314.                 final boolean isNonRotatingOrigin = section2Matcher.group(1).startsWith("dX");
  315.                 loadEOPOldFormat(isNonRotatingOrigin, reader, name);

  317.             } else {

  319.                 // extract x, y, UT1-UTC, dx, dy from section 1
  320.                 loadXYDTDxDyNewFormat(reader, name);

  322.                 // skip to section 3
  323.                 seekToLine(SECTION_3_HEADER, reader, name);

  325.                 // extract LOD data from section 3
  326.                 loadLODNewFormat(reader, name);

  328.                 // set up the EOP entries
  329.                 for (Map.Entry<Integer, double[]> entry : fieldsMap.entrySet()) {
  330.                     final int mjd = entry.getKey();
  331.                     final double[] array = entry.getValue();
  332.                     if (Double.isNaN(array[0] + array[1] + array[2] + array[3] + array[4] + array[5])) {
  333.                         throw notifyUnexpectedErrorEncountered(name);
  334.                     }
  335.                     final AbsoluteDate mjdDate =
  336.                             new AbsoluteDate(new DateComponents(DateComponents.MODIFIED_JULIAN_EPOCH, mjd),
  337.                                              TimeScalesFactory.getUTC());
  338.                     final double[] equinox = converter.toEquinox(mjdDate, array[4], array[5]);
  339.                     if (configuration == null || !configuration.isValid(mjd)) {
  340.                         // get a configuration for current name and date range
  341.                         configuration = itrfVersionLoader.getConfiguration(name, mjd);
  342.                     }
  343.                     history.add(new EOPEntry(mjd, array[0], array[1], array[2], array[3],
  344.                                              equinox[0], equinox[1], array[4], array[5],
  345.                                              configuration.getVersion()));
  346.                 }

  348.             }

  350.         }

  352.         /** Read until a line matching a pattern is found.
  353.          * @param pattern pattern to look for
  354.          * @param reader reader from where file content is obtained
  355.          * @param name name of the file (or zip entry)
  356.          * @return the matching matcher for the line
  357.          * @exception IOException if data can't be read
  358.          */
  359.         private Matcher seekToLine(final Pattern pattern, final BufferedReader reader, final String name)
  360.             throws IOException {

  362.             for (line = reader.readLine(); line != null; line = reader.readLine()) {
  363.                 ++lineNumber;
  364.                 final Matcher matcher = pattern.matcher(line);
  365.                 if (matcher.matches()) {
  366.                     return matcher;
  367.                 }
  368.             }

  370.             // we have reached end of file and not found a matching line
  371.             throw new OrekitException(OrekitMessages.UNEXPECTED_END_OF_FILE_AFTER_LINE,
  372.                                       name, lineNumber);

  374.         }

  376.         /** Read MJD bounds of the final data part from section 1 in the old bulletin B format.
  377.          * @param reader reader from where file content is obtained
  378.          * @param name name of the file (or zip entry)
  379.          * @exception IOException if data can't be read
  380.          */
  381.         private void loadMJDBoundsOldFormat(final BufferedReader reader, final String name)
  382.             throws IOException {

  384.             boolean inFinalValuesPart = false;
  385.             for (line = reader.readLine(); line != null; line = reader.readLine()) {
  386.                 lineNumber++;
  387.                 Matcher matcher = FINAL_VALUES_START.matcher(line);
  388.                 if (matcher.matches()) {
  389.                     // we are entering final values part (in section 1)
  390.                     inFinalValuesPart = true;
  391.                 } else if (inFinalValuesPart) {
  392.                     matcher = SECTION_1_DATA_OLD_FORMAT.matcher(line);
  393.                     if (matcher.matches()) {
  394.                         // this is a data line, build an entry from the extracted fields
  395.                         final int mjd = Integer.parseInt(matcher.group(1));
  396.                         mjdMin = FastMath.min(mjdMin, mjd);
  397.                         mjdMax = FastMath.max(mjdMax, mjd);
  398.                     } else {
  399.                         matcher = FINAL_VALUES_END.matcher(line);
  400.                         if (matcher.matches()) {
  401.                             // we leave final values part
  402.                             return;
  403.                         }
  404.                     }
  405.                 }
  406.             }

  408.             throw new OrekitException(OrekitMessages.UNEXPECTED_END_OF_FILE_AFTER_LINE,
  409.                                       name, lineNumber);

  411.         }

  413.         /** Read EOP data from section 2 in the old bulletin B format.
  414.          * @param isNonRotatingOrigin if true, the file contain Non-Rotating Origin nutation corrections
  415.          * @param reader reader from where file content is obtained
  416.          * @param name name of the file (or zip entry)
  417.          * @exception IOException if data can't be read
  418.          */
  419.         private void loadEOPOldFormat(final boolean isNonRotatingOrigin,
  420.                                       final BufferedReader reader, final String name)
  421.             throws IOException {

  423.             // read the data lines in the final values part inside section 2
  424.             line = reader.readLine();
  425.             while (line != null) {
  426.                 lineNumber++;
  427.                 final Matcher matcher = SECTION_2_DATA_OLD_FORMAT.matcher(line);
  428.                 if (matcher.matches()) {
  429.                     // this is a data line, build an entry from the extracted fields
  430.                     final int    mjd   = Integer.parseInt(matcher.group(1));
  431.                     final double x     = Double.parseDouble(matcher.group(2)) * Constants.ARC_SECONDS_TO_RADIANS;
  432.                     final double y     = Double.parseDouble(matcher.group(3)) * Constants.ARC_SECONDS_TO_RADIANS;
  433.                     final double dtu1  = Double.parseDouble(matcher.group(4));
  434.                     final double lod   = Double.parseDouble(matcher.group(5)) * MILLI_SECONDS_TO_SECONDS;
  435.                     if (mjd >= mjdMin) {
  436.                         final AbsoluteDate mjdDate =
  437.                                 new AbsoluteDate(new DateComponents(DateComponents.MODIFIED_JULIAN_EPOCH, mjd),
  438.                                                  TimeScalesFactory.getUTC());
  439.                         final double[] equinox;
  440.                         final double[] nro;
  441.                         if (isNonRotatingOrigin) {
  442.                             nro = new double[] {
  443.                                 Double.parseDouble(matcher.group(6)) * MILLI_ARC_SECONDS_TO_RADIANS,
  444.                                 Double.parseDouble(matcher.group(7)) * MILLI_ARC_SECONDS_TO_RADIANS
  445.                             };
  446.                             equinox = converter.toEquinox(mjdDate, nro[0], nro[1]);
  447.                         } else {
  448.                             equinox = new double[] {
  449.                                 Double.parseDouble(matcher.group(6)) * MILLI_ARC_SECONDS_TO_RADIANS,
  450.                                 Double.parseDouble(matcher.group(7)) * MILLI_ARC_SECONDS_TO_RADIANS
  451.                             };
  452.                             nro = converter.toNonRotating(mjdDate, equinox[0], equinox[1]);
  453.                         }
  454.                         if (configuration == null || !configuration.isValid(mjd)) {
  455.                             // get a configuration for current name and date range
  456.                             configuration = itrfVersionLoader.getConfiguration(name, mjd);
  457.                         }
  458.                         history.add(new EOPEntry(mjd, dtu1, lod, x, y, equinox[0], equinox[1], nro[0], nro[1],
  459.                                                  configuration.getVersion()));
  460.                         line = mjd < mjdMax ? reader.readLine() : null;
  461.                     } else {
  462.                         line = reader.readLine();
  463.                     }
  464.                 } else {
  465.                     line = reader.readLine();
  466.                 }
  467.             }

  469.         }

  471.         /** Read X, Y, UT1-UTC, dx, dy from section 1 in the new bulletin B format.
  472.          * @param reader reader from where file content is obtained
  473.          * @param name name of the file (or zip entry)
  474.          * @exception IOException if data can't be read
  475.          */
  476.         private void loadXYDTDxDyNewFormat(final BufferedReader reader, final String name)
  477.             throws IOException {

  479.             boolean inFinalValuesPart = false;
  480.             line = reader.readLine();
  481.             while (line != null) {
  482.                 lineNumber++;
  483.                 Matcher matcher = FINAL_VALUES_START.matcher(line);
  484.                 if (matcher.matches()) {
  485.                     // we are entering final values part (in section 1)
  486.                     inFinalValuesPart = true;
  487.                     line = reader.readLine();
  488.                 } else if (inFinalValuesPart) {
  489.                     matcher = SECTION_1_DATA_NEW_FORMAT.matcher(line);
  490.                     if (matcher.matches()) {
  491.                         // this is a data line, build an entry from the extracted fields
  492.                         final int year  = Integer.parseInt(matcher.group(1));
  493.                         final int month = Integer.parseInt(matcher.group(2));
  494.                         final int day   = Integer.parseInt(matcher.group(3));
  495.                         final int mjd   = Integer.parseInt(matcher.group(4));
  496.                         if (new DateComponents(year, month, day).getMJD() != mjd) {
  497.                             throw new OrekitException(OrekitMessages.INCONSISTENT_DATES_IN_IERS_FILE,
  498.                                                       name, year, month, day, mjd);
  499.                         }
  500.                         mjdMin = FastMath.min(mjdMin, mjd);
  501.                         mjdMax = FastMath.max(mjdMax, mjd);
  502.                         final double x    = Double.parseDouble(matcher.group(5)) * MILLI_ARC_SECONDS_TO_RADIANS;
  503.                         final double y    = Double.parseDouble(matcher.group(6)) * MILLI_ARC_SECONDS_TO_RADIANS;
  504.                         final double dtu1 = Double.parseDouble(matcher.group(7)) * MILLI_SECONDS_TO_SECONDS;
  505.                         final double dx   = Double.parseDouble(matcher.group(8)) * MILLI_ARC_SECONDS_TO_RADIANS;
  506.                         final double dy   = Double.parseDouble(matcher.group(9)) * MILLI_ARC_SECONDS_TO_RADIANS;
  507.                         fieldsMap.put(mjd,
  508.                                       new double[] {
  509.                                           dtu1, Double.NaN, x, y, dx, dy
  510.                                       });
  511.                         line = reader.readLine();
  512.                     } else {
  513.                         matcher = FINAL_VALUES_END.matcher(line);
  514.                         line = matcher.matches() ? null : reader.readLine();
  515.                     }
  516.                 } else {
  517.                     line = reader.readLine();
  518.                 }
  519.             }
  520.         }

  522.         /** Read LOD from section 3 in the new bulletin B format.
  523.          * @param reader reader from where file content is obtained
  524.          * @param name name of the file (or zip entry)
  525.          * @exception IOException if data can't be read
  526.          */
  527.         private void loadLODNewFormat(final BufferedReader reader, final String name)
  528.             throws IOException {
  529.             line = reader.readLine();
  530.             while (line != null) {
  531.                 lineNumber++;
  532.                 final Matcher matcher = SECTION_3_DATA_NEW_FORMAT.matcher(line);
  533.                 if (matcher.matches()) {
  534.                     // this is a data line, build an entry from the extracted fields
  535.                     final int    mjd = Integer.parseInt(matcher.group(1));
  536.                     if (mjd >= mjdMin) {
  537.                         final double lod = Double.parseDouble(matcher.group(2)) * MILLI_SECONDS_TO_SECONDS;
  538.                         final double[] array = fieldsMap.get(mjd);
  539.                         if (array == null) {
  540.                             throw notifyUnexpectedErrorEncountered(name);
  541.                         }
  542.                         array[1] = lod;
  543.                         line = mjd >= mjdMax ? null : reader.readLine();
  544.                     } else {
  545.                         line = reader.readLine();
  546.                     }
  547.                 } else {
  548.                     line = reader.readLine();
  549.                 }
  550.             }
  551.         }

  553.         /** Create an exception to be thrown.
  554.          * @param name name of the file (or zip entry)
  555.          * @return OrekitException always thrown to notify an unexpected error has been
  556.          * encountered by the caller
  557.          */
  558.         private OrekitException notifyUnexpectedErrorEncountered(final String name) {
  559.             String loaderName = BulletinBFilesLoader.class.getName();
  560.             loaderName = loaderName.substring(loaderName.lastIndexOf('.') + 1);
  561.             return new OrekitException(OrekitMessages.UNEXPECTED_FILE_FORMAT_ERROR_FOR_LOADER,
  562.                                        name, loaderName);
  563.         }

  565.     }

  567. }
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