+package tim.prune.save.xml;
+
+import java.io.BufferedInputStream;
+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 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 implements TagReceiver
+{
+ private SourceInfo _sourceInfo = null;
+ private String _headerString = null;
+ private String[] _strings = null;
+ private int _pointNum = 0;
+
+
+ /**
+ * 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())
+ {
+ GpxSlicer slicer = new GpxSlicer(this);
+ InputStream istream = null;
+ BufferedInputStream bstream = null;
+ try {
+ if (fileName.endsWith(".gpx") || fileName.endsWith(".xml")) {
+ istream = new FileInputStream(inInfo.getFile());
+ }
+ else if (fileName.endsWith(".zip")) {
+ istream = getZipInputStream(inInfo.getFile());
+ }
+ else if (fileName.endsWith(".gz")) {
+ istream = new GZIPInputStream(new FileInputStream(inInfo.getFile()));
+ }
+ else {
+ System.out.println("GpxCacher unrecognised file type: " + inInfo.getFile().getName());
+ }
+ if (istream != null) {
+ bstream = new BufferedInputStream(istream);
+ slicer.slice(bstream);
+ bstream.close();
+ }
+ } catch (Exception e) {
+ // TODO: Handle errors here with a list of warnings?
+ e.printStackTrace();
+ }
+ }
+ }
+
+ /**
+ * Accept a tag from the slicer
+ */
+ public void reportTag(String inTag)
+ {
+ if (_headerString == null) {
+ _headerString = inTag;
+ }
+ else if (_strings != null)
+ {
+ if (_pointNum < _strings.length)
+ {
+ _strings[_pointNum] = inTag;
+ _pointNum++;
+ }
+ else
+ {
+ // _pointNum has got too high for the strings array
+ // This means the cacher has failed, probably by invalid points - need to give up caching here
+ _strings = null;
+ }
+ }
+ }
+
+
+ /**
+ * @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 (_strings != null && index >= 0 && index < _strings.length) {
+ 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;
+ }
+}