OMMParser.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.files.ccsds;
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 org.hipparchus.exception.DummyLocalizable;
import org.hipparchus.util.FastMath;
import org.orekit.errors.OrekitException;
import org.orekit.errors.OrekitMessages;
import org.orekit.time.AbsoluteDate;
import org.orekit.utils.IERSConventions;
/** A parser for the CCSDS OMM (Orbiter Mean-Elements Message).
* @author sports
* @since 6.1
*/
public class OMMParser extends ODMParser {
/** Simple constructor.
* <p>
* This class is immutable, and hence thread safe. When parts
* must be changed, such as reference date for Mission Elapsed Time or
* Mission Relative Time time systems, or the gravitational coefficient or
* the IERS conventions, the various {@code withXxx} methods must be called,
* which create a new immutable instance with the new parameters. This
* is a combination of the
* <a href="https://en.wikipedia.org/wiki/Builder_pattern">builder design
* pattern</a> and a
* <a href="http://en.wikipedia.org/wiki/Fluent_interface">fluent
* interface</a>.
* </p>
* <p>
* The initial date for Mission Elapsed Time and Mission Relative Time time systems is not set here.
* If such time systems are used, it must be initialized before parsing by calling {@link
* #withMissionReferenceDate(AbsoluteDate)}.
* </p>
* <p>
* The gravitational coefficient is not set here. If it is needed in order
* to parse Cartesian orbits where the value is not set in the CCSDS file, it must
* be initialized before parsing by calling {@link #withMu(double)}.
* </p>
* <p>
* The IERS conventions to use is not set here. If it is needed in order to
* parse some reference frames or UT1 time scale, it must be initialized before
* parsing by calling {@link #withConventions(IERSConventions)}.
* </p>
* <p>
* The international designator parameters (launch year, launch number and
* launch piece) are not set here. If they are needed, they must be initialized before
* parsing by calling {@link #withInternationalDesignator(int, int, String)}
* </p>
*/
public OMMParser() {
this(AbsoluteDate.FUTURE_INFINITY, Double.NaN, null, true, 0, 0, "");
}
/** Complete constructor.
* @param missionReferenceDate reference date for Mission Elapsed Time or Mission Relative Time time systems
* @param mu gravitational coefficient
* @param conventions IERS Conventions
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @param launchYear launch year for TLEs
* @param launchNumber launch number for TLEs
* @param launchPiece piece of launch (from "A" to "ZZZ") for TLEs
*/
private OMMParser(final AbsoluteDate missionReferenceDate, final double mu,
final IERSConventions conventions, final boolean simpleEOP,
final int launchYear, final int launchNumber, final String launchPiece) {
super(missionReferenceDate, mu, conventions, simpleEOP, launchYear, launchNumber, launchPiece);
}
/** {@inheritDoc} */
public OMMParser withMissionReferenceDate(final AbsoluteDate newMissionReferenceDate) {
return new OMMParser(newMissionReferenceDate, getMu(), getConventions(), isSimpleEOP(),
getLaunchYear(), getLaunchNumber(), getLaunchPiece());
}
/** {@inheritDoc} */
public OMMParser withMu(final double newMu) {
return new OMMParser(getMissionReferenceDate(), newMu, getConventions(), isSimpleEOP(),
getLaunchYear(), getLaunchNumber(), getLaunchPiece());
}
/** {@inheritDoc} */
public OMMParser withConventions(final IERSConventions newConventions) {
return new OMMParser(getMissionReferenceDate(), getMu(), newConventions, isSimpleEOP(),
getLaunchYear(), getLaunchNumber(), getLaunchPiece());
}
/** {@inheritDoc} */
public OMMParser withSimpleEOP(final boolean newSimpleEOP) {
return new OMMParser(getMissionReferenceDate(), getMu(), getConventions(), newSimpleEOP,
getLaunchYear(), getLaunchNumber(), getLaunchPiece());
}
/** {@inheritDoc} */
public OMMParser withInternationalDesignator(final int newLaunchYear,
final int newLaunchNumber,
final String newLaunchPiece) {
return new OMMParser(getMissionReferenceDate(), getMu(), getConventions(), isSimpleEOP(),
newLaunchYear, newLaunchNumber, newLaunchPiece);
}
/** {@inheritDoc} */
@Override
public OMMFile parse(final String fileName) throws OrekitException {
return (OMMFile) super.parse(fileName);
}
/** {@inheritDoc} */
@Override
public OMMFile parse(final InputStream stream) throws OrekitException {
return (OMMFile) super.parse(stream);
}
/** {@inheritDoc} */
public OMMFile parse(final InputStream stream, final String fileName) throws OrekitException {
try {
final BufferedReader reader =
new BufferedReader(new InputStreamReader(stream, "UTF-8"));
// initialize internal data structures
final ParseInfo pi = new ParseInfo();
pi.fileName = fileName;
final OMMFile file = pi.file;
// set the additional data that has been configured prior the parsing by the user.
pi.file.setMissionReferenceDate(getMissionReferenceDate());
pi.file.setMuSet(getMu());
pi.file.setConventions(getConventions());
pi.file.getMetaData().setLaunchYear(getLaunchYear());
pi.file.getMetaData().setLaunchNumber(getLaunchNumber());
pi.file.getMetaData().setLaunchPiece(getLaunchPiece());
for (String line = reader.readLine(); line != null; line = reader.readLine()) {
++pi.lineNumber;
if (line.trim().length() == 0) {
continue;
}
pi.keyValue = new KeyValue(line, pi.lineNumber, pi.fileName);
if (pi.keyValue.getKeyword() == null) {
throw new OrekitException(OrekitMessages.CCSDS_UNEXPECTED_KEYWORD, pi.lineNumber, pi.fileName, line);
}
switch (pi.keyValue.getKeyword()) {
case CCSDS_OMM_VERS:
file.setFormatVersion(pi.keyValue.getDoubleValue());
break;
case MEAN_ELEMENT_THEORY:
file.getMetaData().setMeanElementTheory(pi.keyValue.getValue());
break;
case MEAN_MOTION:
file.setMeanMotion(pi.keyValue.getDoubleValue() * FastMath.PI / 43200.0);
break;
case EPHEMERIS_TYPE:
file.setTLERelatedParametersComment(pi.commentTmp);
pi.commentTmp.clear();
file.setEphemerisType(Integer.parseInt(pi.keyValue.getValue()));
break;
case CLASSIFICATION_TYPE:
file.setClassificationType(pi.keyValue.getValue().charAt(0));
break;
case NORAD_CAT_ID:
file.setNoradID(Integer.parseInt(pi.keyValue.getValue()));
break;
case ELEMENT_SET_NO:
file.setElementSetNo(pi.keyValue.getValue());
break;
case REV_AT_EPOCH:
file.setRevAtEpoch(Integer.parseInt(pi.keyValue.getValue()));
break;
case BSTAR:
file.setbStar(pi.keyValue.getDoubleValue());
break;
case MEAN_MOTION_DOT:
file.setMeanMotionDot(pi.keyValue.getDoubleValue() * FastMath.PI / 1.86624e9);
break;
case MEAN_MOTION_DDOT:
file.setMeanMotionDotDot(pi.keyValue.getDoubleValue() *
FastMath.PI / 5.3747712e13);
break;
default:
boolean parsed = false;
parsed = parsed || parseComment(pi.keyValue, pi.commentTmp);
parsed = parsed || parseHeaderEntry(pi.keyValue, file, pi.commentTmp);
parsed = parsed || parseMetaDataEntry(pi.keyValue, file.getMetaData(), pi.commentTmp);
parsed = parsed || parseGeneralStateDataEntry(pi.keyValue, file, pi.commentTmp);
if (!parsed) {
throw new OrekitException(OrekitMessages.CCSDS_UNEXPECTED_KEYWORD, pi.lineNumber, pi.fileName, line);
}
}
}
reader.close();
return file;
} catch (IOException ioe) {
throw new OrekitException(ioe, new DummyLocalizable(ioe.getMessage()));
}
}
/** Private class used to stock OMM parsing info.
* @author sports
*/
private static class ParseInfo {
/** OMM file being read. */
private OMMFile file;
/** Name of the file. */
private String fileName;
/** Current line number. */
private int lineNumber;
/** Key value of the line being read. */
private KeyValue keyValue;
/** Stored comments. */
private List<String> commentTmp;
/** Create a new {@link ParseInfo} object. */
protected ParseInfo() {
lineNumber = 0;
file = new OMMFile();
commentTmp = new ArrayList<String>();
}
}
}