/**
* Creates a new instance of GeoTiffReader
*
* @param input the GeoTiff file
* @param uHints user-supplied hints TODO currently are unused
* @throws DataSourceException
*/
public GeoTiffReader(Object input, Hints uHints) throws DataSourceException {
super(input, uHints);
// /////////////////////////////////////////////////////////////////////
//
// Set the source being careful in case it is an URL pointing to a file
//
// /////////////////////////////////////////////////////////////////////
try {
// setting source
if (input instanceof URL) {
final URL sourceURL = (URL) input;
source = DataUtilities.urlToFile(sourceURL);
}
closeMe = true;
// /////////////////////////////////////////////////////////////////////
//
// Get a stream in order to read from it for getting the basic
// information for this coverage
//
// /////////////////////////////////////////////////////////////////////
if ((source instanceof InputStream) || (source instanceof ImageInputStream)) closeMe = false;
if (source instanceof ImageInputStream) inStream = (ImageInputStream) source;
else {
inStreamSPI = ImageIOExt.getImageInputStreamSPI(source);
if (inStreamSPI == null)
throw new IllegalArgumentException("No input stream for the provided source");
inStream =
inStreamSPI.createInputStreamInstance(
source, ImageIO.getUseCache(), ImageIO.getCacheDirectory());
}
if (inStream == null) {
// Try to figure out what went wrong and provide some info to the user.
if (source instanceof File) {
File f = (File) source;
if (!f.exists()) {
throw new FileNotFoundException("File " + f.getAbsolutePath() + " does not exist.");
} else if (f.isDirectory()) {
throw new IOException("File " + f.getAbsolutePath() + " is a directory.");
} else if (!f.canRead()) {
throw new IOException("File " + f.getAbsolutePath() + " can not be read.");
}
}
// If we can't give anything more specific, throw the generic error.
throw new IllegalArgumentException("No input stream for the provided source");
}
checkForExternalOverviews();
// /////////////////////////////////////////////////////////////////////
//
// Informations about multiple levels and such
//
// /////////////////////////////////////////////////////////////////////
getHRInfo(this.hints);
// /////////////////////////////////////////////////////////////////////
//
// Coverage name
//
// /////////////////////////////////////////////////////////////////////
coverageName = source instanceof File ? ((File) source).getName() : "geotiff_coverage";
final int dotIndex = coverageName.lastIndexOf('.');
if (dotIndex != -1 && dotIndex != coverageName.length())
coverageName = coverageName.substring(0, dotIndex);
} catch (IOException e) {
throw new DataSourceException(e);
} finally {
// /////////////////////////////////////////////////////////////////////
//
// Freeing streams
//
// /////////////////////////////////////////////////////////////////////
if (closeMe && inStream != null) //
try {
inStream.close();
} catch (Throwable t) {
}
}
}
