/**
* performs the creation of a <tt>ImageGridCoverage</tt> from the source assigned to this reader.
*
* @param parameters
* @throws IOException
*/
private GridCoverage performECW(GeneralParameterValueIm[] parameters) throws IOException {
BufferedImage bi = null;
CoverageOffering co = null;
Object[] o = null;
ECWReader ecwFile = null;
try {
String s = ((File) source).getName();
ecwFile = new ECWReader(s);
// get the requested dimension in pixels
int reqWidth = 0;
int reqHeight = 0;
for (int i = 0; i < parameters.length; i++) {
OperationParameterIm op = (OperationParameterIm) parameters[i].getDescriptor();
String name = op.getName();
if (name.equalsIgnoreCase("WIDTH")) {
Object vo = op.getDefaultValue();
reqWidth = ((Integer) vo).intValue();
} else if (name.equalsIgnoreCase("HEIGHT")) {
Object vo = op.getDefaultValue();
reqHeight = ((Integer) vo).intValue();
}
}
// calculate image region of interest
o = getECWImageRegion(reqWidth, reqHeight);
Envelope envl = (Envelope) o[1];
Rectangle rect = (Rectangle) o[0];
bi = ecwFile.getBufferedImage(envl, rect.width, rect.height);
// create a coverage description that matches the sub image (coverage)
// for this a new LonLatEnvelope must be set
co = (CoverageOffering) description.clone();
co.setLonLatEnvelope((LonLatEnvelope) o[2]);
} catch (Exception e) {
e.printStackTrace();
throw new IOException(StringTools.stackTraceToString(e));
} finally {
// free the ECW cache memory
if (ecwFile != null) {
ecwFile.close();
}
}
return new ImageGridCoverage(co, (Envelope) o[1], bi);
}
/**
* performs the creation of a <tt>ImageGridCoverage</tt> from the source assigned to this reader.
*
* @throws IOException
* @throws ParameterNotFoundException
*/
private GridCoverage performImage() throws ParameterNotFoundException, IOException {
BufferedImage bi = readImage();
// get image rectangle of interrest, envelope and lonlatenvelope
Object[] o = getImageRegion(bi.getWidth(), bi.getHeight());
Rectangle rect = (Rectangle) o[0];
// return null if the result GC would have a width or height of zero
if (rect.width == 0 || rect.height == 0) {
return null;
}
bi = bi.getSubimage(rect.x, rect.y, rect.width, rect.height);
// create a coverage description that matches the sub image (coverage)
// for this a new LonLatEnvelope must be set
CoverageOffering co = (CoverageOffering) description.clone();
co.setLonLatEnvelope((LonLatEnvelope) o[2]);
return new ImageGridCoverage(co, (Envelope) o[1], bi);
}