BulletinBFilesLoader.java

  1. /* Copyright 2002-2022 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.frames;

  19. import java.io.BufferedReader;
  20. import java.io.IOException;
  21. import java.io.InputStream;
  22. import java.io.InputStreamReader;
  23. import java.nio.charset.StandardCharsets;
  24. import java.util.ArrayList;
  25. import java.util.Collection;
  26. import java.util.HashMap;
  27. import java.util.List;
  28. import java.util.Map;
  29. import java.util.SortedSet;
  30. import java.util.function.Supplier;
  31. import java.util.regex.Matcher;
  32. import java.util.regex.Pattern;

  34. import org.hipparchus.util.FastMath;
  35. import org.orekit.data.DataProvidersManager;
  36. import org.orekit.errors.OrekitException;
  37. import org.orekit.errors.OrekitMessages;
  38. import org.orekit.time.AbsoluteDate;
  39. import org.orekit.time.DateComponents;
  40. import org.orekit.time.Month;
  41. import org.orekit.time.TimeScale;
  42. import org.orekit.utils.Constants;
  43. import org.orekit.utils.IERSConventions;
  44. import org.orekit.utils.IERSConventions.NutationCorrectionConverter;
  45. import org.orekit.utils.units.UnitsConverter;

  47. /** Loader for bulletin B files.
  48.  * <p>Bulletin B files contain {@link EOPEntry
  49.  * Earth Orientation Parameters} for a few months periods.
  50.  * They correspond to finalized data, suitable for long term
  51.  * a posteriori analysis.</p>
  52.  * <p>The bulletin B files are recognized thanks to their base names,
  53.  * which must match one of the patterns <code>bulletinb_IAU2000-###.txt</code>,
  54.  * <code>bulletinb_IAU2000.###</code>, <code>bulletinb-###.txt</code> or
  55.  * <code>bulletinb.###</code> (or the same ending with <code>.gz</code>
  56.  * for gzip-compressed files) where # stands for a digit character.</p>
  57.  * <p>
  58.  * Starting with bulletin B 252 published in February 2009, buletins B are
  59.  * written in a format containing nutation corrections for both the
  60.  * new IAU2000 nutation model as dx, dy entries in its section 1 and nutation
  61.  * corrections for the old IAU1976 nutation model as dPsi, dEpsilon entries in
  62.  * its section 2. These bulletins are available from IERS <a
  63.  * href="ftp://ftp.iers.org/products/eop/bulletinb/format_2009/">
  64.  *  FTP site</a>. They are also available with exactly the same content
  65.  * (but a different naming convention) from <a
  66.  * href="http://hpiers.obspm.fr/eoppc/bul/bulb_new/">Paris-Meudon
  67.  * observatory site</a>.
  68.  * </p>
  69.  * <p>
  70.  * Ending with bulletin B 263 published in January 2010, bulletins B were
  71.  * written in a format containing only one type of nutation corrections in its
  72.  * section 1, either for new IAU2000 nutation model as dx, dy entries or the old
  73.  * IAU1976 nutation model as dPsi, dEpsilon entries, depending on the file (a pair of
  74.  * files with different name was published each month between March 2003 and January 2010).
  75.  * </p>
  76.  * <p>
  77.  * This class handles both the old and the new format.
  78.  * </p>
  79.  * <p>
  80.  * This class is immutable and hence thread-safe
  81.  * </p>
  82.  * @author Luc Maisonobe
  83.  */
  84. class BulletinBFilesLoader extends AbstractEopLoader implements EOPHistoryLoader {

  86.     /** Section 1 header pattern. */
  87.     private static final Pattern SECTION_1_HEADER;

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

  92.     /** Section 3 header pattern. */
  93.     private static final Pattern SECTION_3_HEADER;

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

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

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

  104.     /** Data line pattern in section 2. */
  105.     private static final Pattern SECTION_2_DATA_OLD_FORMAT;

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

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

  113.     static {

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

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

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

  219.     }

  221.     /** Build a loader for IERS bulletins B files.
  222.      * @param supportedNames regular expression for supported files names
  223.      * @param manager provides access to the bulletin B files.
  224.      * @param utcSupplier UTC time scale.
  225.      */
  226.     BulletinBFilesLoader(final String supportedNames,
  227.                          final DataProvidersManager manager,
  228.                          final Supplier<TimeScale> utcSupplier) {
  229.         super(supportedNames, manager, utcSupplier);
  230.     }

  232.     /** {@inheritDoc} */
  233.     public void fillHistory(final IERSConventions.NutationCorrectionConverter converter,
  234.                             final SortedSet<EOPEntry> history) {
  235.         final ItrfVersionProvider itrfVersionProvider = new ITRFVersionLoader(
  236.                 ITRFVersionLoader.SUPPORTED_NAMES,
  237.                 getDataProvidersManager());
  238.         final Parser parser = new Parser(converter, itrfVersionProvider, getUtc());
  239.         final EopParserLoader loader = new EopParserLoader(parser);
  240.         this.feed(loader);
  241.         history.addAll(loader.getEop());
  242.     }

  244.     /** Internal class performing the parsing. */
  245.     static class Parser extends AbstractEopParser {

  247.         /** ITRF version configuration. */
  248.         private ITRFVersionLoader.ITRFVersionConfiguration configuration;

  250.         /** History entries. */
  251.         private List<EOPEntry> history;

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

  256.         /** Current line number. */
  257.         private int lineNumber;

  259.         /** Current line. */
  260.         private String line;

  262.         /** Start of final data. */
  263.         private int mjdMin;

  265.         /** End of final data. */
  266.         private int mjdMax;

  268.         /**
  269.          * Simple constructor.
  270.          *
  271.          * @param converter           converter to use
  272.          * @param itrfVersionProvider to use for determining the ITRF version of the EOP.
  273.          * @param utc                 time scale for parsing dates.
  274.          */
  275.         Parser(final NutationCorrectionConverter converter,
  276.                final ItrfVersionProvider itrfVersionProvider,
  277.                final TimeScale utc) {
  278.             super(converter, itrfVersionProvider, utc);
  279.             this.fieldsMap         = new HashMap<>();
  280.             this.lineNumber        = 0;
  281.             this.mjdMin            = Integer.MAX_VALUE;
  282.             this.mjdMax            = Integer.MIN_VALUE;
  283.         }

  285.         /** {@inheritDoc} */
  286.         @Override
  287.         public Collection<EOPEntry> parse(final InputStream input, final String name)
  288.             throws IOException {

  290.             // set up a reader for line-oriented bulletin B files
  291.             try (BufferedReader reader = new BufferedReader(new InputStreamReader(input, StandardCharsets.UTF_8))) {
  292.                 // reset parse info to start new file
  293.                 fieldsMap.clear();
  294.                 lineNumber = 0;
  295.                 mjdMin     = Integer.MAX_VALUE;
  296.                 mjdMax     = Integer.MIN_VALUE;
  297.                 history = new ArrayList<>();
  298.                 configuration = null;

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

  304.                 if (isOldFormat) {

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

  309.                     final Matcher section2Matcher = seekToLine(SECTION_2_HEADER_OLD, reader, name);
  310.                     final boolean isNonRotatingOrigin = section2Matcher.group(1).startsWith("dX");
  311.                     loadEOPOldFormat(isNonRotatingOrigin, reader, name);

  313.                 } else {

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

  318.                     // skip to section 3
  319.                     seekToLine(SECTION_3_HEADER, reader, name);

  321.                     // extract LOD data from section 3
  322.                     loadLODNewFormat(reader, name);

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

  344.                 }
  345.             }

  347.             return history;

  349.         }

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

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

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

  373.         }

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

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

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

  410.         }

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

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

  468.         }

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

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

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

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

  564.     }

  566. }
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