SP3Parser.java
- /* Copyright 2002-2012 Space Applications Services
- * 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.files.sp3;
- import java.io.BufferedReader;
- import java.io.IOException;
- import java.io.InputStream;
- import java.io.InputStreamReader;
- import java.nio.charset.StandardCharsets;
- import java.nio.file.Files;
- import java.nio.file.Paths;
- import java.util.Locale;
- import java.util.Optional;
- import java.util.Scanner;
- import java.util.function.Function;
- import java.util.regex.Pattern;
- import java.util.stream.Stream;
- import org.hipparchus.geometry.euclidean.threed.Vector3D;
- import org.orekit.errors.OrekitException;
- import org.orekit.errors.OrekitMessages;
- import org.orekit.files.general.EphemerisFileParser;
- import org.orekit.files.sp3.SP3File.SP3Coordinate;
- import org.orekit.files.sp3.SP3File.SP3FileType;
- import org.orekit.files.sp3.SP3File.TimeSystem;
- import org.orekit.frames.Frame;
- import org.orekit.frames.FramesFactory;
- import org.orekit.time.AbsoluteDate;
- import org.orekit.time.TimeScale;
- import org.orekit.time.TimeScalesFactory;
- import org.orekit.utils.CartesianDerivativesFilter;
- import org.orekit.utils.Constants;
- import org.orekit.utils.IERSConventions;
- /** A parser for the SP3 orbit file format. It supports all formats from sp3-a
- * to sp3-d.
- * <p>
- * <b>Note:</b> this parser is thread-safe, so calling {@link #parse} from
- * different threads is allowed.
- * </p>
- * @see <a href="ftp://igs.org/pub/data/format/sp3_docu.txt">SP3-a file format</a>
- * @see <a href="ftp://igs.org/pub/data/format/sp3c.txt">SP3-c file format</a>
- * @see <a href="ftp://igs.org/pub/data/format/sp3d.pdf">SP3-d file format</a>
- * @author Thomas Neidhart
- * @author Luc Maisonobe
- */
- public class SP3Parser implements EphemerisFileParser {
- /** Spaces delimiters. */
- private static final String SPACES = "\\s+";
- /** One millimeter, in meters. */
- private static final double MILLIMETER = 1.0e-3;
- /** Standard gravitational parameter in m^3 / s^2. */
- private final double mu;
- /** Number of data points to use in interpolation. */
- private final int interpolationSamples;
- /** Mapping from frame identifier in the file to a {@link Frame}. */
- private final Function<? super String, ? extends Frame> frameBuilder;
- /**
- * Create an SP3 parser using default values.
- *
- * @see #SP3Parser(double, int, Function)
- */
- public SP3Parser() {
- this(Constants.EIGEN5C_EARTH_MU, 7, SP3Parser::guessFrame);
- }
- /**
- * Create an SP3 parser and specify the extra information needed to create a {@link
- * org.orekit.propagation.Propagator Propagator} from the ephemeris data.
- *
- * @param mu is the standard gravitational parameter to use for
- * creating {@link org.orekit.orbits.Orbit Orbits} from
- * the ephemeris data. See {@link Constants}.
- * @param interpolationSamples is the number of samples to use when interpolating.
- * @param frameBuilder is a function that can construct a frame from an SP3
- * coordinate system string. The coordinate system can be
- * any 5 character string e.g. ITR92, IGb08.
- */
- public SP3Parser(final double mu,
- final int interpolationSamples,
- final Function<? super String, ? extends Frame> frameBuilder) {
- this.mu = mu;
- this.interpolationSamples = interpolationSamples;
- this.frameBuilder = frameBuilder;
- }
- /**
- * Default string to {@link Frame} conversion for {@link #SP3Parser()}.
- *
- * @param name of the frame.
- * @return ITRF based on 2010 conventions,
- * with tidal effects considered during EOP interpolation.
- */
- private static Frame guessFrame(final String name) {
- return FramesFactory.getITRF(IERSConventions.IERS_2010, false);
- }
- /**
- * Parse a SP3 file from an input stream using the UTF-8 charset.
- *
- * <p> This method creates a {@link BufferedReader} from the stream and as such this
- * method may read more data than necessary from {@code stream} and the additional
- * data will be lost. The other parse methods do not have this issue.
- *
- * @param stream to read the SP3 file from.
- * @return a parsed SP3 file.
- * @throws IOException if {@code stream} throws one.
- * @see #parse(String)
- * @see #parse(BufferedReader, String)
- */
- public SP3File parse(final InputStream stream) throws IOException {
- try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream, StandardCharsets.UTF_8))) {
- return parse(reader, stream.toString());
- }
- }
- @Override
- public SP3File parse(final String fileName) throws IOException, OrekitException {
- try (BufferedReader reader = Files.newBufferedReader(Paths.get(fileName),
- StandardCharsets.UTF_8)) {
- return parse(reader, fileName);
- }
- }
- @Override
- public SP3File parse(final BufferedReader reader,
- final String fileName) throws IOException {
- // initialize internal data structures
- final ParseInfo pi = new ParseInfo();
- int lineNumber = 0;
- Stream<LineParser> candidateParsers = Stream.of(LineParser.HEADER_VERSION);
- for (String line = reader.readLine(); line != null; line = reader.readLine()) {
- ++lineNumber;
- final String l = line;
- final Optional<LineParser> selected = candidateParsers.filter(p -> p.canHandle(l)).findFirst();
- if (selected.isPresent()) {
- try {
- selected.get().parse(line, pi);
- } catch (StringIndexOutOfBoundsException | NumberFormatException e) {
- throw new OrekitException(e,
- OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
- lineNumber, fileName, line);
- }
- candidateParsers = selected.get().allowedNext();
- } else {
- throw new OrekitException(OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
- lineNumber, fileName, line);
- }
- if (pi.done) {
- if (pi.nbEpochs != pi.file.getNumberOfEpochs()) {
- throw new OrekitException(OrekitMessages.SP3_NUMBER_OF_EPOCH_MISMATCH,
- pi.nbEpochs, fileName, pi.file.getNumberOfEpochs());
- }
- return pi.file;
- }
- }
- // we never reached the EOF marker
- throw new OrekitException(OrekitMessages.SP3_UNEXPECTED_END_OF_FILE, lineNumber);
- }
- /** Returns the {@link SP3FileType} that corresponds to a given string in a SP3 file.
- * @param fileType file type as string
- * @return file type as enum
- */
- private static SP3FileType getFileType(final String fileType) {
- SP3FileType type = SP3FileType.UNDEFINED;
- if ("G".equalsIgnoreCase(fileType)) {
- type = SP3FileType.GPS;
- } else if ("M".equalsIgnoreCase(fileType)) {
- type = SP3FileType.MIXED;
- } else if ("R".equalsIgnoreCase(fileType)) {
- type = SP3FileType.GLONASS;
- } else if ("L".equalsIgnoreCase(fileType)) {
- type = SP3FileType.LEO;
- } else if ("E".equalsIgnoreCase(fileType)) {
- type = SP3FileType.GALILEO;
- } else if ("C".equalsIgnoreCase(fileType)) {
- type = SP3FileType.COMPASS;
- } else if ("J".equalsIgnoreCase(fileType)) {
- type = SP3FileType.QZSS;
- }
- return type;
- }
- /** Transient data used for parsing a sp3 file. The data is kept in a
- * separate data structure to make the parser thread-safe.
- * <p><b>Note</b>: The class intentionally does not provide accessor
- * methods, as it is only used internally for parsing a SP3 file.</p>
- */
- private class ParseInfo {
- /** The corresponding SP3File object. */
- private SP3File file;
- /** The latest epoch as read from the SP3 file. */
- private AbsoluteDate latestEpoch;
- /** The latest position as read from the SP3 file. */
- private Vector3D latestPosition;
- /** The latest clock value as read from the SP3 file. */
- private double latestClock;
- /** Indicates if the SP3 file has velocity entries. */
- private boolean hasVelocityEntries;
- /** The timescale used in the SP3 file. */
- private TimeScale timeScale;
- /** The number of satellites as contained in the SP3 file. */
- private int maxSatellites;
- /** The number of satellites accuracies already seen. */
- private int nbAccuracies;
- /** The number of epochs already seen. */
- private int nbEpochs;
- /** End Of File reached indicator. */
- private boolean done;
- /** The base for pos/vel. */
- //private double posVelBase;
- /** The base for clock/rate. */
- //private double clockBase;
- /** Create a new {@link ParseInfo} object. */
- protected ParseInfo() {
- file = new SP3File(mu, interpolationSamples, frameBuilder);
- latestEpoch = null;
- latestPosition = null;
- latestClock = 0.0;
- hasVelocityEntries = false;
- timeScale = TimeScalesFactory.getGPS();
- maxSatellites = 0;
- nbAccuracies = 0;
- nbEpochs = 0;
- done = false;
- //posVelBase = 2d;
- //clockBase = 2d;
- }
- }
- /** Parsers for specific lines. */
- private enum LineParser {
- /** Parser for version, epoch, data used and agency information. */
- HEADER_VERSION("^#[a-z].*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- try (Scanner s1 = new Scanner(line);
- Scanner s2 = s1.useDelimiter(SPACES);
- Scanner scanner = s2.useLocale(Locale.US)) {
- scanner.skip("#");
- final String v = scanner.next();
- final char version = v.substring(0, 1).toLowerCase().charAt(0);
- if (version != 'a' && version != 'b' && version != 'c' && version != 'd') {
- throw new OrekitException(OrekitMessages.SP3_UNSUPPORTED_VERSION, version);
- }
- pi.hasVelocityEntries = "V".equals(v.substring(1, 2));
- pi.file.setFilter(pi.hasVelocityEntries ?
- CartesianDerivativesFilter.USE_PV :
- CartesianDerivativesFilter.USE_P);
- final int year = Integer.parseInt(v.substring(2));
- final int month = scanner.nextInt();
- final int day = scanner.nextInt();
- final int hour = scanner.nextInt();
- final int minute = scanner.nextInt();
- final double second = scanner.nextDouble();
- final AbsoluteDate epoch = new AbsoluteDate(year, month, day,
- hour, minute, second,
- TimeScalesFactory.getGPS());
- pi.file.setEpoch(epoch);
- final int numEpochs = scanner.nextInt();
- pi.file.setNumberOfEpochs(numEpochs);
- // data used indicator
- pi.file.setDataUsed(scanner.next());
- pi.file.setCoordinateSystem(scanner.next());
- pi.file.setOrbitTypeKey(scanner.next());
- pi.file.setAgency(scanner.next());
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_DATE_TIME_REFERENCE);
- }
- },
- /** Parser for additional date/time references in gps/julian day notation. */
- HEADER_DATE_TIME_REFERENCE("^##.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- try (Scanner s1 = new Scanner(line);
- Scanner s2 = s1.useDelimiter(SPACES);
- Scanner scanner = s2.useLocale(Locale.US)) {
- scanner.skip("##");
- // gps week
- pi.file.setGpsWeek(scanner.nextInt());
- // seconds of week
- pi.file.setSecondsOfWeek(scanner.nextDouble());
- // epoch interval
- pi.file.setEpochInterval(scanner.nextDouble());
- // julian day
- pi.file.setJulianDay(scanner.nextInt());
- // day fraction
- pi.file.setDayFraction(scanner.nextDouble());
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_SAT_IDS);
- }
- },
- /** Parser for satellites identifiers. */
- HEADER_SAT_IDS("^\\+ .*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- if (pi.maxSatellites == 0) {
- // this is the first ids line, it also contains the number of satellites
- pi.maxSatellites = Integer.parseInt(line.substring(3, 6).trim());
- }
- final int lineLength = line.length();
- int count = pi.file.getSatelliteCount();
- int startIdx = 9;
- while (count++ < pi.maxSatellites && (startIdx + 3) <= lineLength) {
- final String satId = line.substring(startIdx, startIdx + 3).trim();
- if (satId.length() > 0) {
- pi.file.addSatellite(satId);
- }
- startIdx += 3;
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_SAT_IDS, HEADER_ACCURACY);
- }
- },
- /** Parser for general accuracy information for each satellite. */
- HEADER_ACCURACY("^\\+\\+.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- final int lineLength = line.length();
- int startIdx = 9;
- while (pi.nbAccuracies < pi.maxSatellites && (startIdx + 3) <= lineLength) {
- final String sub = line.substring(startIdx, startIdx + 3).trim();
- if (sub.length() > 0) {
- final int exponent = Integer.parseInt(sub);
- // the accuracy is calculated as 2**exp (in mm)
- pi.file.setAccuracy(pi.nbAccuracies++, (2 << exponent) * MILLIMETER);
- }
- startIdx += 3;
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_ACCURACY, HEADER_TIME_SYSTEM);
- }
- },
- /** Parser for time system. */
- HEADER_TIME_SYSTEM("^%c.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- if (pi.file.getType() == null) {
- // this the first custom fields line, the only one really used
- pi.file.setType(getFileType(line.substring(3, 5).trim()));
- // now identify the time system in use
- final String tsStr = line.substring(9, 12).trim();
- pi.file.setTimeScaleString(tsStr);
- final TimeSystem ts;
- if (tsStr.equalsIgnoreCase("ccc")) {
- ts = TimeSystem.GPS;
- } else {
- ts = TimeSystem.valueOf(tsStr);
- }
- pi.file.setTimeSystem(ts);
- switch (ts) {
- case GPS:
- pi.timeScale = TimeScalesFactory.getGPS();
- break;
- case GAL:
- pi.timeScale = TimeScalesFactory.getGST();
- break;
- case GLO:
- pi.timeScale = TimeScalesFactory.getGLONASS();
- break;
- case QZS:
- pi.timeScale = TimeScalesFactory.getQZSS();
- break;
- case TAI:
- pi.timeScale = TimeScalesFactory.getTAI();
- break;
- case UTC:
- pi.timeScale = TimeScalesFactory.getUTC();
- break;
- default:
- pi.timeScale = TimeScalesFactory.getGPS();
- break;
- }
- pi.file.setTimeScale(pi.timeScale);
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_TIME_SYSTEM, HEADER_STANDARD_DEVIATIONS);
- }
- },
- /** Parser for standard deviations of position/velocity/clock components. */
- HEADER_STANDARD_DEVIATIONS("^%f.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- // String base = line.substring(3, 13).trim();
- // if (!base.equals("0.0000000")) {
- // // (mm or 10**-4 mm/sec)
- // pi.posVelBase = Double.valueOf(base);
- // }
- // base = line.substring(14, 26).trim();
- // if (!base.equals("0.000000000")) {
- // // (psec or 10**-4 psec/sec)
- // pi.clockBase = Double.valueOf(base);
- // }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_STANDARD_DEVIATIONS, HEADER_CUSTOM_PARAMETERS);
- }
- },
- /** Parser for custom parameters. */
- HEADER_CUSTOM_PARAMETERS("^%i.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- // ignore additional custom parameters
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_CUSTOM_PARAMETERS, HEADER_COMMENTS);
- }
- },
- /** Parser for comments. */
- HEADER_COMMENTS("^/\\*.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- // ignore comments
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(HEADER_COMMENTS, DATA_EPOCH);
- }
- },
- /** Parser for epoch. */
- DATA_EPOCH("^\\* .*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- final int year = Integer.parseInt(line.substring(3, 7).trim());
- final int month = Integer.parseInt(line.substring(8, 10).trim());
- final int day = Integer.parseInt(line.substring(11, 13).trim());
- final int hour = Integer.parseInt(line.substring(14, 16).trim());
- final int minute = Integer.parseInt(line.substring(17, 19).trim());
- final double second = Double.parseDouble(line.substring(20, 31).trim());
- pi.latestEpoch = new AbsoluteDate(year, month, day,
- hour, minute, second,
- pi.timeScale);
- pi.nbEpochs++;
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(DATA_POSITION);
- }
- },
- /** Parser for position. */
- DATA_POSITION("^P.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- final String satelliteId = line.substring(1, 4).trim();
- if (!pi.file.containsSatellite(satelliteId)) {
- pi.latestPosition = null;
- } else {
- final double x = Double.parseDouble(line.substring(4, 18).trim());
- final double y = Double.parseDouble(line.substring(18, 32).trim());
- final double z = Double.parseDouble(line.substring(32, 46).trim());
- // the position values are in km and have to be converted to m
- pi.latestPosition = new Vector3D(x * 1000, y * 1000, z * 1000);
- // clock (microsec)
- pi.latestClock =
- Double.parseDouble(line.substring(46, 60).trim()) * 1e6;
- // the additional items are optional and not read yet
- // if (line.length() >= 73) {
- // // x-sdev (b**n mm)
- // int xStdDevExp = Integer.valueOf(line.substring(61,
- // 63).trim());
- // // y-sdev (b**n mm)
- // int yStdDevExp = Integer.valueOf(line.substring(64,
- // 66).trim());
- // // z-sdev (b**n mm)
- // int zStdDevExp = Integer.valueOf(line.substring(67,
- // 69).trim());
- // // c-sdev (b**n psec)
- // int cStdDevExp = Integer.valueOf(line.substring(70,
- // 73).trim());
- //
- // pi.posStdDevRecord =
- // new PositionStdDevRecord(FastMath.pow(pi.posVelBase, xStdDevExp),
- // FastMath.pow(pi.posVelBase,
- // yStdDevExp), FastMath.pow(pi.posVelBase, zStdDevExp),
- // FastMath.pow(pi.clockBase, cStdDevExp));
- //
- // String clockEventFlag = line.substring(74, 75);
- // String clockPredFlag = line.substring(75, 76);
- // String maneuverFlag = line.substring(78, 79);
- // String orbitPredFlag = line.substring(79, 80);
- // }
- if (!pi.hasVelocityEntries) {
- final SP3Coordinate coord =
- new SP3Coordinate(pi.latestEpoch,
- pi.latestPosition,
- pi.latestClock);
- pi.file.addSatelliteCoordinate(satelliteId, coord);
- }
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(DATA_EPOCH, DATA_POSITION, DATA_POSITION_CORRELATION, DATA_VELOCITY, EOF);
- }
- },
- /** Parser for position correlation. */
- DATA_POSITION_CORRELATION("^EP.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- // ignored for now
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(DATA_EPOCH, DATA_POSITION, DATA_VELOCITY, EOF);
- }
- },
- /** Parser for velocity. */
- DATA_VELOCITY("^V.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- final String satelliteId = line.substring(1, 4).trim();
- if (pi.file.containsSatellite(satelliteId)) {
- final double xv = Double.parseDouble(line.substring(4, 18).trim());
- final double yv = Double.parseDouble(line.substring(18, 32).trim());
- final double zv = Double.parseDouble(line.substring(32, 46).trim());
- // the velocity values are in dm/s and have to be converted to m/s
- final Vector3D velocity = new Vector3D(xv / 10d, yv / 10d, zv / 10d);
- // clock rate in file is 1e-4 us / s
- final double clockRateChange =
- Double.parseDouble(line.substring(46, 60).trim()) * 1e10;
- // the additional items are optional and not read yet
- // if (line.length() >= 73) {
- // // xvel-sdev (b**n 10**-4 mm/sec)
- // int xVstdDevExp = Integer.valueOf(line.substring(61,
- // 63).trim());
- // // yvel-sdev (b**n 10**-4 mm/sec)
- // int yVstdDevExp = Integer.valueOf(line.substring(64,
- // 66).trim());
- // // zvel-sdev (b**n 10**-4 mm/sec)
- // int zVstdDevExp = Integer.valueOf(line.substring(67,
- // 69).trim());
- // // clkrate-sdev (b**n 10**-4 psec/sec)
- // int clkStdDevExp = Integer.valueOf(line.substring(70,
- // 73).trim());
- // }
- final SP3Coordinate coord =
- new SP3Coordinate(pi.latestEpoch,
- pi.latestPosition,
- velocity,
- pi.latestClock,
- clockRateChange);
- pi.file.addSatelliteCoordinate(satelliteId, coord);
- }
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(DATA_EPOCH, DATA_POSITION, DATA_VELOCITY_CORRELATION, EOF);
- }
- },
- /** Parser for velocity correlation. */
- DATA_VELOCITY_CORRELATION("^EV.*") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- // ignored for now
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(DATA_EPOCH, DATA_POSITION, EOF);
- }
- },
- /** Parser for End Of File marker. */
- EOF("^[eE][oO][fF]\\s*$") {
- /** {@inheritDoc} */
- @Override
- public void parse(final String line, final ParseInfo pi) {
- pi.done = true;
- }
- /** {@inheritDoc} */
- @Override
- public Stream<LineParser> allowedNext() {
- return Stream.of(EOF);
- }
- };
- /** Pattern for identifying line. */
- private final Pattern pattern;
- /** Simple constructor.
- * @param lineRegexp regular expression for identifying line
- */
- LineParser(final String lineRegexp) {
- pattern = Pattern.compile(lineRegexp);
- }
- /** Parse a line.
- * @param line line to parse
- * @param pi holder for transient data
- */
- public abstract void parse(String line, ParseInfo pi);
- /** Get the allowed parsers for next line.
- * @return allowed parsers for next line
- */
- public abstract Stream<LineParser> allowedNext();
- /** Check if parser can handle line.
- * @param line line to parse
- * @return true if parser can handle the specified line
- */
- public boolean canHandle(final String line) {
- return pattern.matcher(line).matches();
- }
- }
- }