+++ /dev/null
-package tim.prune.save;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.InputStream;
-import java.util.zip.GZIPInputStream;
-import java.util.zip.ZipEntry;
-import java.util.zip.ZipInputStream;
-
-import javax.xml.parsers.SAXParser;
-import javax.xml.parsers.SAXParserFactory;
-
-import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
-import org.xml.sax.helpers.DefaultHandler;
-
-import tim.prune.data.DataPoint;
-import tim.prune.data.SourceInfo;
-
-/**
- * Class to read in a GPX file and cache all the point strings
- */
-public class GpxCacher extends DefaultHandler
-{
- private SourceInfo _sourceInfo = null;
- private String _headerString = null;
- private String[] _strings = null;
- private int _pointNum = 0;
- private boolean _insidePoint = false;
- private StringBuilder _builder = null;
-
-
- /**
- * Constructor
- * @param inSourceInfo source information
- */
- public GpxCacher(SourceInfo inInfo)
- {
- _sourceInfo = inInfo;
- _strings = new String[inInfo.getNumPoints()];
- _pointNum = 0;
- // Should be a gpx file, but might be raw, zipped or gzipped
- File gpxFile = inInfo.getFile();
- String fileName = gpxFile.getName().toLowerCase();
- if (gpxFile.exists() && gpxFile.canRead())
- {
- try {
- SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
- if (fileName.endsWith(".gpx") || fileName.endsWith(".xml")) {
- saxParser.parse(inInfo.getFile(), this);
- }
- else if (fileName.endsWith(".zip")) {
- saxParser.parse(getZipInputStream(inInfo.getFile()), this);
- }
- else if (fileName.endsWith(".gz")) {
- saxParser.parse(new GZIPInputStream(new FileInputStream(inInfo.getFile())), this);
- }
- else {
- System.out.println("GpxCacher unrecognised file type: " + inInfo.getFile().getName());
- }
- } catch (Exception e) {
- // TODO: Handle errors here with a list of warnings?
- e.printStackTrace();
- }
- }
- _builder = null;
- }
-
-
- /**
- * Receive the start of a tag
- */
- public void startElement(String inUri, String inLocalName, String inTagName,
- Attributes inAttributes) throws SAXException
- {
- if (inTagName.equalsIgnoreCase("gpx"))
- {
- // store initial gpx tag
- _builder = new StringBuilder(60);
- appendTag(_builder, inTagName, inAttributes);
- _headerString = _builder.toString();
- }
- else
- {
- if (inTagName.equalsIgnoreCase("wpt") || inTagName.equalsIgnoreCase("trkpt")
- || inTagName.equalsIgnoreCase("rtept"))
- {
- _insidePoint = true;
- _builder = new StringBuilder(60);
- }
- if (_insidePoint) {
- appendTag(_builder, inTagName, inAttributes);
- }
- }
- super.startElement(inUri, inLocalName, inTagName, inAttributes);
- }
-
- /**
- * Receive characters between tags (inside or outside)
- */
- public void characters(char[] inChars, int inStart, int inLength)
- throws SAXException
- {
- if (_insidePoint) {
- _builder.append(new String(inChars, inStart, inLength));
- }
- super.characters(inChars, inStart, inLength);
- }
-
- /**
- * Receive end of xml tag
- */
- public void endElement(String inUri, String inLocalName, String inTagName)
- throws SAXException
- {
- if (_insidePoint) {
- _builder.append("</").append(inTagName).append('>');
- }
- if (inTagName.equalsIgnoreCase("wpt") || inTagName.equalsIgnoreCase("trkpt")
- || inTagName.equalsIgnoreCase("rtept"))
- {
- _strings[_pointNum] = _builder.toString();
- _pointNum++;
- _insidePoint = false;
- }
- super.endElement(inUri, inLocalName, inTagName);
- }
-
-
- /**
- * Append the current tag to the supplied StringBuilder
- * @param inBuilder Stringbuilder object to append tag to
- * @param inTagName name of tag
- * @param inAttributes attributes of tag
- */
- private static void appendTag(StringBuilder inBuilder, String inTagName, Attributes inAttributes)
- {
- inBuilder.append('<').append(inTagName);
- int numAtts = inAttributes.getLength();
- for (int i=0; i<numAtts; i++) {
- inBuilder.append(' ').append(inAttributes.getQName(i)).append("=\"")
- .append(inAttributes.getValue(i)).append('"');
- }
- inBuilder.append('>');
- }
-
-
- /**
- * @return the header string from the GPX tag
- */
- public String getHeaderString()
- {
- return _headerString;
- }
-
- /**
- * Get the source string for the given point
- * @param inPoint point to retrieve
- * @return string if found, otherwise null
- */
- public String getSourceString(DataPoint inPoint)
- {
- int index = _sourceInfo.getIndex(inPoint);
- if (index >= 0) {
- return _strings[index];
- }
- return null;
- }
-
- /**
- * Get an inputstream of a GPX file inside a zip
- * @param inFile File object describing zip file
- * @return input stream for Xml parser
- */
- private static InputStream getZipInputStream(File inFile)
- {
- try
- {
- ZipInputStream zis = new ZipInputStream(new FileInputStream(inFile));
- while (zis.available() > 0)
- {
- ZipEntry entry = zis.getNextEntry();
- String entryName = entry.toString();
- if (entryName != null && entryName.length() > 4)
- {
- String suffix = entryName.substring(entryName.length()-4).toLowerCase();
- if (suffix.equals(".gpx") || suffix.equals(".xml")) {
- // First matching file so must be gpx
- return zis;
- }
- }
- }
- }
- catch (Exception e) {} // ignore errors
- // not found - error!
- return null;
- }
-}
projects / GpsPrune.git / blobdiff