Package org.orekit.gnss

Class SEMParser

java.lang.Object

org.orekit.data.AbstractSelfFeedingLoader

org.orekit.gnss.SEMParser

All Implemented Interfaces:

DataLoader

public class SEMParser
extends AbstractSelfFeedingLoader
implements DataLoader

This class reads SEM almanac files and provides GPS almanacs.

The definition of a SEM almanac comes from the U.S. COAST GUARD NAVIGATION CENTER.

The format of the files holding SEM almanacs is not precisely specified, so the parsing rules have been deduced from the downloadable files at NAVCEN and at CelesTrak.

Since:

8.0

Author:

Pascal Parraud

Constructor Summary

Constructors

Constructor	Description
SEMParser(String supportedNames)	Simple constructor.
SEMParser(String supportedNames, DataProvidersManager dataProvidersManager, TimeScales timeScales)	Create a SEM loader/parser with the given source of SEM auxiliary data files.

Method Summary

Modifier and Type	Method	Description
List<GPSAlmanac>	getAlmanacs()	Gets all the GPS almanacs read from the file.
List<Integer>	getPRNNumbers()	Gets the PRN numbers of all the GPS almanacs read from the file.
String	getSupportedNames()	Get the supported names regular expression.
void	loadData()	Loads almanacs.
void	loadData(InputStream input, String name)	Load data from a stream.
boolean	stillAcceptsData()	Check if the loader still accepts new data.

Methods inherited from class org.orekit.data.AbstractSelfFeedingLoader

feed, getDataProvidersManager, setSupportedNames

Methods inherited from class java.lang.Object

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

Constructor Details

SEMParser

@DefaultDataContext
public SEMParser(String supportedNames)

Simple constructor.

This constructor does not load any data by itself. Data must be loaded later on by calling one of the loadData() method or the loadData(inputStream, fileName) method.

The supported files names are used when getting data from the loadData() method that relies on the default data context. They are useless when getting data from the loadData(input, name) method.

Parameters:

supportedNames - regular expression for supported files names (if null, a default pattern matching files with a ".al3" extension will be used)

See Also:

• loadData()
• SEMParser(String, DataProvidersManager, TimeScales)

SEMParser

public SEMParser(String supportedNames,
 DataProvidersManager dataProvidersManager,
 TimeScales timeScales)

Create a SEM loader/parser with the given source of SEM auxiliary data files.

This constructor does not load any data by itself. Data must be loaded later on by calling one of the loadData() method or the loadData(inputStream, fileName) method.

The supported files names are used when getting data from the loadData() method that relies on the dataProvidersManager. They are useless when getting data from the loadData(input, name) method.

Parameters:

supportedNames - regular expression for supported files names (if null, a default pattern matching files with a ".al3" extension will be used)

dataProvidersManager - provides access to auxiliary data.

timeScales - to use when parsing the GPS dates.

Since:

10.1

See Also:

• loadData()

Method Details

loadData

public void loadData()

Loads almanacs.

The almanacs already loaded in the instance will be discarded and replaced by the newly loaded data.

This feature is useful when the file selection is already set up by the data providers manager configuration.

loadData

public void loadData(InputStream input,
 String name)
              throws IOException,
ParseException,
OrekitException

Description copied from interface: DataLoader

Load data from a stream.

Specified by:

loadData in interface DataLoader

Parameters:

input - data input stream

name - name of the file (or zip entry)

Throws:

IOException - if data can't be read

ParseException - if data can't be parsed or if some loader specific error occurs

OrekitException

stillAcceptsData

public boolean stillAcceptsData()

Description copied from interface: DataLoader

Check if the loader still accepts new data.

This method is used to speed up data loading by interrupting crawling the data sets as soon as a loader has found the data it was waiting for. For loaders that can merge data from any number of sources (for example JPL ephemerides or Earth Orientation Parameters that are split among several files), this method should always return true to make sure no data is left over.

Specified by:

stillAcceptsData in interface DataLoader

Returns:

true while the loader still accepts new data

getAlmanacs

public List<GPSAlmanac> getAlmanacs()

Gets all the GPS almanacs read from the file.

Returns:

the list of GPSAlmanac from the file

getPRNNumbers

public List<Integer> getPRNNumbers()

Gets the PRN numbers of all the GPS almanacs read from the file.

Returns:

the PRN numbers of all the GPS almanacs read from the file

getSupportedNames

public String getSupportedNames()

Description copied from class: AbstractSelfFeedingLoader

Get the supported names regular expression.

Overrides:

getSupportedNames in class AbstractSelfFeedingLoader

Returns:

the supported names.

See Also:

• DataProvidersManager.feed(String, DataLoader)