@Override
public void run() {
Database database = input.getDatabase();
Relation<O> relation = database.getRelation(distance.getInputTypeRestriction());
DistanceQuery<O> distanceQuery = database.getDistanceQuery(relation, distance);
KNNQuery<O> knnQ = database.getKNNQuery(distanceQuery, DatabaseQuery.HINT_HEAVY_USE);
// open file.
try (RandomAccessFile file = new RandomAccessFile(out, "rw");
FileChannel channel = file.getChannel();
// and acquire a file write lock
FileLock lock = channel.lock()) {
// write magic header
file.writeInt(KNN_CACHE_MAGIC);
int bufsize = k * 12 * 2 + 10; // Initial size, enough for 2 kNN.
ByteBuffer buffer = ByteBuffer.allocateDirect(bufsize);
FiniteProgress prog =
LOG.isVerbose() ? new FiniteProgress("Computing kNN", relation.size(), LOG) : null;
for (DBIDIter it = relation.iterDBIDs(); it.valid(); it.advance()) {
final KNNList nn = knnQ.getKNNForDBID(it, k);
final int nnsize = nn.size();
// Grow the buffer when needed:
if (nnsize * 12 + 10 > bufsize) {
while (nnsize * 12 + 10 > bufsize) {
bufsize <<= 1;
}
buffer = ByteBuffer.allocateDirect(bufsize);
}
buffer.clear();
ByteArrayUtil.writeUnsignedVarint(buffer, it.internalGetIndex());
ByteArrayUtil.writeUnsignedVarint(buffer, nnsize);
int c = 0;
for (DoubleDBIDListIter ni = nn.iter(); ni.valid(); ni.advance(), c++) {
ByteArrayUtil.writeUnsignedVarint(buffer, ni.internalGetIndex());
buffer.putDouble(ni.doubleValue());
}
if (c != nn.size()) {
throw new AbortException("Sizes did not agree. Cache is invalid.");
}
buffer.flip();
channel.write(buffer);
LOG.incrementProcessed(prog);
}
LOG.ensureCompleted(prog);
lock.release();
} catch (IOException e) {
LOG.exception(e);
}
// FIXME: close!
}
/**
* Show a "Save as" dialog.
*
* @param plot The plot to be exported.
* @param width The width of the exported image (when export to JPEG/PNG).
* @param height The height of the exported image (when export to JPEG/PNG).
* @return Result from {@link JFileChooser#showSaveDialog}
*/
public static int showSaveDialog(SVGPlot plot, int width, int height) {
double quality = 1.0;
int ret = -1;
JFileChooser fc = new JFileChooser(new File("."));
fc.setDialogTitle(DEFAULT_TITLE);
// fc.setFileFilter(new ImageFilter());
SaveOptionsPanel optionsPanel = new SaveOptionsPanel(fc, width, height);
fc.setAccessory(optionsPanel);
ret = fc.showSaveDialog(null);
fc.setDialogTitle("Saving... Please wait.");
if (ret == JFileChooser.APPROVE_OPTION) {
File file = fc.getSelectedFile();
String format = optionsPanel.getSelectedFormat();
if (format == null || automagic_format.equals(format)) {
format = guessFormat(file.getName());
}
try {
if (format == null) {
showError(fc, "Error saving image.", "File format not recognized.");
} else if ("jpeg".equals(format) || "jpg".equals(format)) {
quality = optionsPanel.getJPEGQuality();
plot.saveAsJPEG(file, width, height, quality);
} else if ("png".equals(format)) {
plot.saveAsPNG(file, width, height);
} else if ("ps".equals(format)) {
plot.saveAsPS(file);
} else if ("eps".equals(format)) {
plot.saveAsEPS(file);
} else if ("pdf".equals(format)) {
plot.saveAsPDF(file);
} else if ("svg".equals(format)) {
plot.saveAsSVG(file);
} else {
showError(fc, "Error saving image.", "Unsupported format: " + format);
}
} catch (java.lang.IncompatibleClassChangeError e) {
showError(
fc,
"Error saving image.",
"It seems that your Java version is incompatible with this version of Batik and Jpeg writing. Sorry.");
} catch (ClassNotFoundException e) {
showError(
fc,
"Error saving image.",
"A class was not found when saving this image. Maybe installing Apache FOP will help (for PDF, PS and EPS output).\n"
+ e.toString());
} catch (IOException e) {
LOG.exception(e);
showError(fc, "Error saving image.", e.toString());
} catch (TranscoderException e) {
LOG.exception(e);
showError(fc, "Error saving image.", e.toString());
} catch (TransformerFactoryConfigurationError e) {
LOG.exception(e);
showError(fc, "Error saving image.", e.toString());
} catch (TransformerException e) {
LOG.exception(e);
showError(fc, "Error saving image.", e.toString());
} catch (Exception e) {
LOG.exception(e);
showError(fc, "Error saving image.", e.toString());
}
} else if (ret == JFileChooser.ERROR_OPTION) {
showError(fc, "Error in file dialog.", "Unknown Error.");
} else if (ret == JFileChooser.CANCEL_OPTION) {
// do nothing - except return result
}
return ret;
}