RapidDataAndPredictionColumnsLoader.java
/* Copyright 2002-2018 CS Systèmes d'Information
* Licensed to CS Systèmes d'Information (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.orekit.frames;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.hipparchus.util.MathUtils;
import org.orekit.data.DataLoader;
import org.orekit.data.DataProvidersManager;
import org.orekit.errors.OrekitException;
import org.orekit.errors.OrekitMessages;
import org.orekit.time.AbsoluteDate;
import org.orekit.time.DateComponents;
import org.orekit.time.TimeScalesFactory;
import org.orekit.utils.IERSConventions;
/** Loader for IERS rapid data and prediction files in columns format (finals file).
* <p>Rapid data and prediction files contain {@link EOPEntry
* Earth Orientation Parameters} for several years periods, in one file
* only that is updated regularly.</p>
* <p>
* These files contain both the data from IERS Bulletin A and IERS bulletin B.
* This class parses only the part from Bulletin A.
* </p>
* <p>The rapid data and prediction file is recognized thanks to its base name,
* which must match one of the the patterns <code>finals.*</code> or
* <code>finals2000A.*</code> (or the same ending with <code>.gz</code>
* for gzip-compressed files) where * stands for a word like "all", "daily",
* or "data". The file with 2000A in their name correspond to the
* IAU-2000 precession-nutation model whereas the files without any identifier
* correspond to the IAU-1980 precession-nutation model. The files with the all
* suffix start from 1973-01-01, the file with the data suffix start
* from 1992-01-01 and the files with the daily suffix.</p>
* <p>
* This class is immutable and hence thread-safe
* </p>
* @author Romain Di Costanzo
* @see <a href="http://maia.usno.navy.mil/ser7/readme.finals2000A">finals2000A file format description at USNO</a>
* @see <a href="http://maia.usno.navy.mil/ser7/readme.finals">finals file format description at USNO</a>
*/
class RapidDataAndPredictionColumnsLoader implements EOPHistoryLoader {
/** Conversion factor. */
private static final double ARC_SECONDS_TO_RADIANS = MathUtils.TWO_PI / 1296000;
/** Conversion factor. */
private static final double MILLI_ARC_SECONDS_TO_RADIANS = ARC_SECONDS_TO_RADIANS / 1000;
/** Conversion factor. */
private static final double MILLI_SECONDS_TO_SECONDS = 1.0e-3;
/** Field for year, month and day parsing. */
private static final String INTEGER2_FIELD = "((?:\\p{Blank}|\\p{Digit})\\p{Digit})";
/** Field for modified Julian day parsing. */
private static final String MJD_FIELD = "\\p{Blank}+(\\p{Digit}+)(?:\\.00*)";
/** Field for separator parsing. */
private static final String SEPARATOR = "\\p{Blank}*[IP]";
/** Field for real parsing. */
private static final String REAL_FIELD = "\\p{Blank}*(-?\\p{Digit}*\\.\\p{Digit}*)";
/** Start index of the date part of the line. */
private static int DATE_START = 0;
/** end index of the date part of the line. */
private static int DATE_END = 15;
/** Pattern to match the date part of the line (always present). */
private static final Pattern DATE_PATTERN = Pattern.compile(INTEGER2_FIELD + INTEGER2_FIELD + INTEGER2_FIELD + MJD_FIELD);
/** Start index of the pole part of the line. */
private static int POLE_START = 16;
/** end index of the pole part of the line. */
private static int POLE_END = 55;
/** Pattern to match the pole part of the line. */
private static final Pattern POLE_PATTERN = Pattern.compile(SEPARATOR + REAL_FIELD + REAL_FIELD + REAL_FIELD + REAL_FIELD);
/** Start index of the UT1-UTC part of the line. */
private static int UT1_UTC_START = 57;
/** end index of the UT1-UTC part of the line. */
private static int UT1_UTC_END = 78;
/** Pattern to match the UT1-UTC part of the line. */
private static final Pattern UT1_UTC_PATTERN = Pattern.compile(SEPARATOR + REAL_FIELD + REAL_FIELD);
/** Start index of the LOD part of the line. */
private static int LOD_START = 79;
/** end index of the LOD part of the line. */
private static int LOD_END = 93;
/** Pattern to match the LOD part of the line. */
private static final Pattern LOD_PATTERN = Pattern.compile(REAL_FIELD + REAL_FIELD);
/** Start index of the nutation part of the line. */
private static int NUTATION_START = 95;
/** end index of the nutation part of the line. */
private static int NUTATION_END = 134;
/** Pattern to match the nutation part of the line. */
private static final Pattern NUTATION_PATTERN = Pattern.compile(SEPARATOR + REAL_FIELD + REAL_FIELD + REAL_FIELD + REAL_FIELD);
/** Type of nutation corrections. */
private final boolean isNonRotatingOrigin;
/** File supported name. */
private final String supportedNames;
/** Build a loader for IERS bulletins B files.
* @param isNonRotatingOrigin if true the supported files <em>must</em>
* contain δX/δY nutation corrections, otherwise they
* <em>must</em> contain δΔψ/δΔε nutation
* corrections
* @param supportedNames regular expression for supported files names
*/
RapidDataAndPredictionColumnsLoader(final boolean isNonRotatingOrigin,
final String supportedNames) {
this.isNonRotatingOrigin = isNonRotatingOrigin;
this.supportedNames = supportedNames;
}
/** {@inheritDoc} */
public void fillHistory(final IERSConventions.NutationCorrectionConverter converter,
final SortedSet<EOPEntry> history)
throws OrekitException {
final Parser parser = new Parser(converter, isNonRotatingOrigin);
DataProvidersManager.getInstance().feed(supportedNames, parser);
history.addAll(parser.history);
}
/** Internal class performing the parsing. */
private static class Parser implements DataLoader {
/** Converter for nutation corrections. */
private final IERSConventions.NutationCorrectionConverter converter;
/** Configuration for ITRF versions. */
private final ITRFVersionLoader itrfVersionLoader;
/** Indicator for Non-Rotating Origin. */
private final boolean isNonRotatingOrigin;
/** History entries. */
private final List<EOPEntry> history;
/** Current line number. */
private int lineNumber;
/** Current line. */
private String line;
/** Simple constructor.
* @param converter converter to use
* @param isNonRotatingOrigin type of nutation correction
* @exception OrekitException if ITRF version loader cannot be parsed
*/
Parser(final IERSConventions.NutationCorrectionConverter converter,
final boolean isNonRotatingOrigin)
throws OrekitException {
this.converter = converter;
this.itrfVersionLoader = new ITRFVersionLoader(ITRFVersionLoader.SUPPORTED_NAMES);
this.isNonRotatingOrigin = isNonRotatingOrigin;
this.history = new ArrayList<EOPEntry>();
this.lineNumber = 0;
}
/** {@inheritDoc} */
public boolean stillAcceptsData() {
return true;
}
/** {@inheritDoc} */
public void loadData(final InputStream input, final String name)
throws OrekitException, IOException {
ITRFVersionLoader.ITRFVersionConfiguration configuration = null;
// set up a reader for line-oriented bulletin B files
final BufferedReader reader = new BufferedReader(new InputStreamReader(input, "UTF-8"));
// reset parse info to start new file (do not clear history!)
lineNumber = 0;
for (line = reader.readLine(); line != null; line = reader.readLine()) {
lineNumber++;
// split the lines in its various columns (some of them can be blank)
final String datePart = (line.length() >= DATE_END) ? line.substring(DATE_START, DATE_END) : "";
final String polePart = (line.length() >= POLE_END) ? line.substring(POLE_START, POLE_END) : "";
final String ut1utcPart = (line.length() >= UT1_UTC_END ) ? line.substring(UT1_UTC_START, UT1_UTC_END) : "";
final String lodPart = (line.length() >= LOD_END) ? line.substring(LOD_START, LOD_END) : "";
final String nutationPart = (line.length() >= NUTATION_END) ? line.substring(NUTATION_START, NUTATION_END) : "";
// parse the date part
final Matcher dateMatcher = DATE_PATTERN.matcher(datePart);
final int mjd;
if (dateMatcher.matches()) {
final int yy = Integer.parseInt(dateMatcher.group(1).trim());
final int mm = Integer.parseInt(dateMatcher.group(2).trim());
final int dd = Integer.parseInt(dateMatcher.group(3).trim());
mjd = Integer.parseInt(dateMatcher.group(4).trim());
final DateComponents reconstructedDate = new DateComponents(DateComponents.MODIFIED_JULIAN_EPOCH, mjd);
if ((reconstructedDate.getYear() % 100) != yy ||
reconstructedDate.getMonth() != mm ||
reconstructedDate.getDay() != dd) {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
} else {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
// parse the pole part
final double x;
final double y;
if (polePart.trim().length() == 0) {
// pole part is blank
x = 0;
y = 0;
} else {
final Matcher poleMatcher = POLE_PATTERN.matcher(polePart);
if (poleMatcher.matches()) {
x = ARC_SECONDS_TO_RADIANS * Double.parseDouble(poleMatcher.group(1));
y = ARC_SECONDS_TO_RADIANS * Double.parseDouble(poleMatcher.group(3));
} else {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
}
// parse the UT1-UTC part
final double dtu1;
if (ut1utcPart.trim().length() == 0) {
// UT1-UTC part is blank
dtu1 = 0;
} else {
final Matcher ut1utcMatcher = UT1_UTC_PATTERN.matcher(ut1utcPart);
if (ut1utcMatcher.matches()) {
dtu1 = Double.parseDouble(ut1utcMatcher.group(1));
} else {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
}
// parse the lod part
final double lod;
if (lodPart.trim().length() == 0) {
// lod part is blank
lod = 0;
} else {
final Matcher lodMatcher = LOD_PATTERN.matcher(lodPart);
if (lodMatcher.matches()) {
lod = MILLI_SECONDS_TO_SECONDS * Double.parseDouble(lodMatcher.group(1));
} else {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
}
// parse the nutation part
final double[] nro;
final double[] equinox;
if (nutationPart.trim().length() == 0) {
// nutation part is blank
nro = new double[2];
equinox = new double[2];
} else {
final Matcher nutationMatcher = NUTATION_PATTERN.matcher(nutationPart);
final AbsoluteDate mjdDate =
new AbsoluteDate(new DateComponents(DateComponents.MODIFIED_JULIAN_EPOCH, mjd),
TimeScalesFactory.getUTC());
if (nutationMatcher.matches()) {
if (isNonRotatingOrigin) {
nro = new double[] {
MILLI_ARC_SECONDS_TO_RADIANS * Double.parseDouble(nutationMatcher.group(1)),
MILLI_ARC_SECONDS_TO_RADIANS * Double.parseDouble(nutationMatcher.group(3))
};
equinox = converter.toEquinox(mjdDate, nro[0], nro[1]);
} else {
equinox = new double[] {
MILLI_ARC_SECONDS_TO_RADIANS * Double.parseDouble(nutationMatcher.group(1)),
MILLI_ARC_SECONDS_TO_RADIANS * Double.parseDouble(nutationMatcher.group(3))
};
nro = converter.toNonRotating(mjdDate, equinox[0], equinox[1]);
}
} else {
throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
lineNumber, name, line);
}
}
if (configuration == null || !configuration.isValid(mjd)) {
// get a configuration for current name and date range
configuration = itrfVersionLoader.getConfiguration(name, mjd);
}
history.add(new EOPEntry(mjd, dtu1, lod, x, y, equinox[0], equinox[1], nro[0], nro[1],
configuration.getVersion()));
}
}
}
}