org.orekit.files.ccsds

Class ODMParser

java.lang.Object

org.orekit.files.ccsds.ODMParser

Direct Known Subclasses:

OEMParser, OMMParser, OPMParser

public abstract class ODMParser
extends Object

Base class for all CCSDS Orbit Data Message parsers.

This base 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 withXxx methods must be called, which create a new immutable instance with the new parameters. This is a combination of the builder design pattern and a fluent interface.

Since:

6.1

Author:

Luc Maisonobe

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ODMParser(AbsoluteDate missionReferenceDate, double mu, IERSConventions conventions, boolean simpleEOP, int launchYear, int launchNumber, String launchPiece) Complete constructor.

Method Summary

Modifier and Type	Method and Description
IERSConventions	getConventions() Get IERS conventions.
int	getLaunchNumber() Get the launch number.
String	getLaunchPiece() Get the piece of launch.
int	getLaunchYear() Get the launch year.
AbsoluteDate	getMissionReferenceDate() Get initial date.
double	getMu() Get gravitational coefficient.
boolean	isSimpleEOP() Get EOP interpolation method.
ODMFile	parse(InputStream stream) Parse a CCSDS Orbit Data Message.
abstract ODMFile	parse(InputStream stream, String fileName) Parse a CCSDS Orbit Data Message.
ODMFile	parse(String fileName) Parse a CCSDS Orbit Data Message.
protected CCSDSFrame	parseCCSDSFrame(String frameName) Parse a CCSDS frame.
protected boolean	parseComment(org.orekit.files.ccsds.KeyValue keyValue, List<String> comment) Parse a comment line.
protected AbsoluteDate	parseDate(String date, CcsdsTimeScale timeSystem) Parse a date.
protected boolean	parseGeneralStateDataEntry(org.orekit.files.ccsds.KeyValue keyValue, OGMFile general, List<String> comment) Parse a general state data key = value entry.
protected boolean	parseHeaderEntry(org.orekit.files.ccsds.KeyValue keyValue, ODMFile odmFile, List<String> comment) Parse an entry from the header.
protected boolean	parseMetaDataEntry(org.orekit.files.ccsds.KeyValue keyValue, ODMMetaData metaData, List<String> comment) Parse a meta-data key = value entry.
abstract ODMParser	withConventions(IERSConventions newConventions) Set IERS conventions.
abstract ODMParser	withInternationalDesignator(int newLaunchYear, int newLaunchNumber, String newLaunchPiece) Set international designator.
abstract ODMParser	withMissionReferenceDate(AbsoluteDate newMissionReferenceDate) Set initial date.
abstract ODMParser	withMu(double newMu) Set gravitational coefficient.
abstract ODMParser	withSimpleEOP(boolean newSimpleEOP) Set EOP interpolation method.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ODMParser

protected ODMParser(AbsoluteDate missionReferenceDate,
                    double mu,
                    IERSConventions conventions,
                    boolean simpleEOP,
                    int launchYear,
                    int launchNumber,
                    String launchPiece)

Complete constructor.

Parameters:

missionReferenceDate - reference date for Mission Elapsed Time or Mission Relative Time time systems

mu - gravitational coefficient

conventions - IERS Conventions

simpleEOP - if true, tidal effects are ignored when interpolating EOP

launchYear - launch year for TLEs

launchNumber - launch number for TLEs

launchPiece - piece of launch (from "A" to "ZZZ") for TLEs

Method Detail

withMissionReferenceDate

public abstract ODMParser withMissionReferenceDate(AbsoluteDate newMissionReferenceDate)

Set initial date.

Parameters:

newMissionReferenceDate - mission reference date to use while parsing

Returns:

a new instance, with mission reference date replaced

See Also:

getMissionReferenceDate()

getMissionReferenceDate

public AbsoluteDate getMissionReferenceDate()

Get initial date.

Returns:

mission reference date to use while parsing

See Also:

withMissionReferenceDate(AbsoluteDate)

withMu

public abstract ODMParser withMu(double newMu)

Set gravitational coefficient.

Parameters:

newMu - gravitational coefficient to use while parsing

Returns:

a new instance, with gravitational coefficient date replaced

See Also:

getMu()

getMu

public double getMu()

Get gravitational coefficient.

Returns:

gravitational coefficient to use while parsing

See Also:

withMu(double)

withConventions

public abstract ODMParser withConventions(IERSConventions newConventions)

Set IERS conventions.

Parameters:

newConventions - IERS conventions to use while parsing

Returns:

a new instance, with IERS conventions replaced

See Also:

getConventions()

getConventions

public IERSConventions getConventions()

Get IERS conventions.

Returns:

IERS conventions to use while parsing

See Also:

withConventions(IERSConventions)

withSimpleEOP

public abstract ODMParser withSimpleEOP(boolean newSimpleEOP)

Set EOP interpolation method.

Parameters:

newSimpleEOP - if true, tidal effects are ignored when interpolating EOP

Returns:

a new instance, with EOP interpolation method replaced

See Also:

isSimpleEOP()

isSimpleEOP

public boolean isSimpleEOP()

Get EOP interpolation method.

Returns:

true if tidal effects are ignored when interpolating EOP

See Also:

withSimpleEOP(boolean)

withInternationalDesignator

public abstract ODMParser withInternationalDesignator(int newLaunchYear,
                                                      int newLaunchNumber,
                                                      String newLaunchPiece)

Set international designator.

This method may be used to ensure the launch year number and pieces are correctly set if they are not present in the CCSDS file header in the OBJECT_ID in the form YYYY-NNN-P{PP}. If they are already in the header, they will be parsed automatically regardless of this method being called or not (i.e. header information override information set here).

Parameters:

newLaunchYear - launch year

newLaunchNumber - launch number

newLaunchPiece - piece of launch (from "A" to "ZZZ")

Returns:

a new instance, with TLE settings replaced

getLaunchYear

public int getLaunchYear()

Get the launch year.

Returns:

launch year

getLaunchNumber

public int getLaunchNumber()

Get the launch number.

Returns:

launch number

getLaunchPiece

public String getLaunchPiece()

Get the piece of launch.

Returns:

piece of launch

parse

public ODMFile parse(String fileName)
              throws OrekitException

Parse a CCSDS Orbit Data Message.

Parameters:

fileName - name of the file containing the message

Returns:

parsed orbit

Throws:

OrekitException - if orbit message cannot be parsed

parse

public ODMFile parse(InputStream stream)
              throws OrekitException

Parse a CCSDS Orbit Data Message.

Parameters:

stream - stream containing message

Returns:

parsed orbit

Throws:

OrekitException - if orbit message cannot be parsed

parse

public abstract ODMFile parse(InputStream stream,
                              String fileName)
                       throws OrekitException

Parse a CCSDS Orbit Data Message.

Parameters:

stream - stream containing message

fileName - name of the file containing the message (for error messages)

Returns:

parsed orbit

Throws:

OrekitException - if orbit message cannot be parsed

parseComment

protected boolean parseComment(org.orekit.files.ccsds.KeyValue keyValue,
                               List<String> comment)

Parse a comment line.

Parameters:

keyValue - key=value pair containing the comment

comment - placeholder where the current comment line should be added

Returns:

true if the line was a comment line and was parsed

parseHeaderEntry

protected boolean parseHeaderEntry(org.orekit.files.ccsds.KeyValue keyValue,
                                   ODMFile odmFile,
                                   List<String> comment)
                            throws OrekitException

Parse an entry from the header.

Parameters:

keyValue - key = value pair

odmFile - instance to update with parsed entry

comment - previous comment lines, will be emptied if used by the keyword

Returns:

true if the keyword was a header keyword and has been parsed

Throws:

OrekitException - if UTC time scale cannot be retrieved to parse creation date

parseMetaDataEntry

protected boolean parseMetaDataEntry(org.orekit.files.ccsds.KeyValue keyValue,
                                     ODMMetaData metaData,
                                     List<String> comment)
                              throws OrekitException

Parse a meta-data key = value entry.

Parameters:

keyValue - key = value pair

metaData - instance to update with parsed entry

comment - previous comment lines, will be emptied if used by the keyword

Returns:

true if the keyword was a meta-data keyword and has been parsed

Throws:

OrekitException - if center body or frame cannot be retrieved

parseGeneralStateDataEntry

protected boolean parseGeneralStateDataEntry(org.orekit.files.ccsds.KeyValue keyValue,
                                             OGMFile general,
                                             List<String> comment)
                                      throws OrekitException

Parse a general state data key = value entry.

Parameters:

keyValue - key = value pair

general - instance to update with parsed entry

comment - previous comment lines, will be emptied if used by the keyword

Returns:

true if the keyword was a meta-data keyword and has been parsed

Throws:

OrekitException - if center body or frame cannot be retrieved

parseCCSDSFrame

protected CCSDSFrame parseCCSDSFrame(String frameName)

Parse a CCSDS frame.

Parameters:

frameName - name of the frame, as the value of a CCSDS key=value line

Returns:

CCSDS frame corresponding to the name

parseDate

protected AbsoluteDate parseDate(String date,
                                 CcsdsTimeScale timeSystem)
                          throws OrekitException

Parse a date.

Parameters:

date - date to parse, as the value of a CCSDS key=value line

timeSystem - time system to use

Returns:

parsed date

Throws:

OrekitException - if some time scale cannot be retrieved