org.dstadler.commons.gpx.GPXTrackpointsParser Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of commons-dost Show documentation
Show all versions of commons-dost Show documentation
Common utilities I find useful in many of my projects.
package org.dstadler.commons.gpx;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.text.ParseException;
import java.util.Arrays;
import java.util.Date;
import java.util.SortedMap;
import java.util.TimeZone;
import java.util.concurrent.atomic.AtomicLong;
import java.util.logging.Logger;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.time.FastDateFormat;
import org.dstadler.commons.logging.jdk.LoggerFactory;
import org.dstadler.commons.util.SuppressForbidden;
import org.dstadler.commons.xml.AbstractSimpleContentHandler;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
public class GPXTrackpointsParser extends AbstractSimpleContentHandler {
private static final Logger log = LoggerFactory.make();
@SuppressForbidden(reason = "Uses System.exit")
// this is an App mostly for testing arbitrary files for proper parsing
public static void main(String[] args) throws IOException {
LoggerFactory.initLogging();
if (args.length < 1) {
log.severe("Usage: GPXTrackpointsParser ...");
System.exit(1);
}
for (String arg : args) {
File gpxFile = new File(arg);
if (!gpxFile.exists()) {
log.severe("GPX-File does not exist: " + gpxFile);
System.exit(2);
}
SortedMap points = GPXTrackpointsParser.parseContent(gpxFile);
log.info("Found " + points.size() + " points in GPX-File " + gpxFile);
log.info("First point: " + points.values().iterator().next());
}
}
/*
Move
261
150
85
23.9
2.99
10215
*/
private static final String TAG_TRKPT = "trkpt";
private static final String TAG_RTEPT = "rtept";
private static final String TAG_ELE = "ele";
private static final String TAG_TIME = "time";
// for now parse wpt-elements the same way as trkpt
private static final String TAG_WPT = "wpt";
private static final String TAG_LAT = "lat";
private static final String TAG_LON = "lon";
private static final String TAG_HR = "hr";
private static final String TAG_CADENCE = "cadence"; // Suunto extension
private static final String TAG_SPEED = "speed"; // Suunto extension
private static final String TAG_ATEMP = "atemp"; // Garmin extension
private static final String TAG_TEMP = "temp"; // OpenAmbit
private static final String TAG_PRESSURE = "SeaLevelPressure"; // OpenAmbit
private static final String TAG_METADATA = "metadata";
private static final FastDateFormat[] TIME_FORMATS = new FastDateFormat[] {
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", TimeZone.getTimeZone("Europe/Vienna")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone("Europe/Vienna")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSZZ", TimeZone.getTimeZone("Europe/Vienna")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss", TimeZone.getTimeZone("Europe/Vienna")),
};
private static final FastDateFormat[] TIME_FORMATS_UTC = new FastDateFormat[] {
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'", TimeZone.getTimeZone("UTC")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss'Z'", TimeZone.getTimeZone("UTC")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss.SSSZZ", TimeZone.getTimeZone("UTC")),
FastDateFormat.getInstance("yyyy-MM-dd'T'HH:mm:ss", TimeZone.getTimeZone("UTC")),
};
private final AtomicLong syntheticTime = new AtomicLong();
private boolean metaData = false;
public static SortedMap parseContent(File file) throws IOException {
GPXTrackpointsParser parser = new GPXTrackpointsParser();
try (InputStream stream = new BufferedInputStream(new FileInputStream(file), 200*1024)) {
return parser.parseContent(stream);
} catch (IOException | SAXException e) {
throw new IOException("While reading file: " + file, e);
}
}
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes) {
if(localName.equals(TAG_TRKPT) || localName.equals(TAG_RTEPT) || localName.equals(TAG_WPT)) {
if (currentTags != null) {
throw new IllegalStateException("Should not have tags when a config starts in the XML, but had: " + currentTags);
}
currentTags = new TrackPoint();
String lat = attributes.getValue(TAG_LAT);
if(StringUtils.isNotBlank(lat)) {
currentTags.setLatitude(Double.parseDouble(lat));
}
String lon = attributes.getValue(TAG_LON);
if(StringUtils.isNotBlank(lon)) {
currentTags.setLongitude(Double.parseDouble(lon));
}
} else if (localName.equals(TAG_METADATA)) {
metaData = true;
}
}
@Override
public void endElement(String uri, String localName, String qName) {
if(localName.equals(TAG_TRKPT) || localName.equals(TAG_RTEPT) || localName.equals(TAG_WPT)) {
checkState(currentTags.getLatitude() != 0 && currentTags.getLongitude() != 0,
"Expected to have tag 'lat' and 'lon' for trkpt in the XML, but did not find it for tag %s1 in: %s2",
localName, currentTags);
// GPX files for a planned route do not contain time-markers,
// let's use a counter in this case to still sort trackpoints properly
if (currentTags.time == null) {
currentTags.setTime(new Date(syntheticTime.incrementAndGet()));
}
configs.put(currentTags.time.getTime(), currentTags);
currentTags = null;
} else if (localName.equals(TAG_METADATA)) {
metaData = false;
} else {
String value = characters.toString().trim();
switch (localName) {
case TAG_ELE:
// some files contain invalid elevation
if (!"null".equals(value) && StringUtils.isNotBlank(value)) {
currentTags.setElevation(Double.parseDouble(value));
}
break;
case TAG_TIME:
if (metaData) {
break;
}
if (currentTags == null) {
log.warning("Found " + TAG_TIME + " with value '" + value + "' outside of " + TAG_TRKPT);
break;
}
if ("0".equals(value) || StringUtils.isBlank(value)) {
break;
}
boolean parsed = false;
for (FastDateFormat timeFormat :
// we changed from non-UTC timestamp to UTC-based timestamps in the GPX
// at some point and some external files use slightly different format, so
// we have to try until we find the proper format
value.length() >= 4 && Integer.parseInt(value.substring(0, 4)) >= 2022 ? TIME_FORMATS_UTC : TIME_FORMATS) {
try {
currentTags.setTime(timeFormat.parse(value));
parsed = true;
break;
} catch (ParseException e) {
// ignored here as we try others
}
}
if (!parsed) {
throw new IllegalStateException("Failed to parse time from: " + value +
" with patterns " + Arrays.toString(TIME_FORMATS));
}
break;
case TAG_HR:
currentTags.setHr(Integer.parseInt(value));
break;
case TAG_CADENCE:
currentTags.setCadence(Integer.parseInt(value));
break;
case TAG_SPEED:
currentTags.setSpeed(Double.parseDouble(value));
break;
case TAG_ATEMP:
currentTags.setTemp(Double.parseDouble(value));
break;
case TAG_TEMP:
currentTags.setTemp(Double.parseDouble(value));
break;
case TAG_PRESSURE:
currentTags.setSeaLevelPressure(Integer.parseInt(value));
break;
}
characters.setLength(0);
}
}
private static void checkState(boolean expression, String errorMessage, Object arg1, Object arg2) {
if (!expression) {
throw new IllegalStateException(errorMessage.
replace("%s1", arg1.toString()).
replace("%s2", arg2.toString()));
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy