org.orekit.gnss

Class SEMParser

java.lang.Object

org.orekit.gnss.SEMParser

All Implemented Interfaces:

DataLoader

public class SEMParser
extends Object
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 and Description
SEMParser(String supportedNames) Simple constructor.

Method Summary

Modifier and Type	Method and 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 for data files.
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 java.lang.Object

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

Constructor Detail

SEMParser

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 data providers manager. 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()

Method Detail

loadData

public void loadData()
              throws OrekitException

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.

Throws:

OrekitException - if some data can't be read, some file content is corrupted or no GPS almanac is available.

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

OrekitException - if some data is missing or if some loader specific error occurs

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()

Get the supported names for data files.

Returns:

regular expression for the supported names for data files