/**
* The write class selects the encoding parameter considering the image format requested. Then,
* the correct writer will encode the img given by the render into the servlet output stream
*
* @param wmsResponse The object used later to build the HTTP response.
* @param output The output stream
* @param format desired image format
* @param img The output image.
* @param pixelSize be provided by the server
* @throws IOException If a problem has been encountered while handling the output stream.
*/
public static void write(
WMSResponse wmsResponse,
OutputStream output,
String format,
BufferedImage img,
double pixelSize)
throws IOException {
if (format.equalsIgnoreCase(ImageFormats.JPEG.toString())) {
writeJPEG(wmsResponse, output, img);
wmsResponse.setResponseCode(200);
LOGGER.debug("JPEG written to the output stream.");
} else if (format.equalsIgnoreCase(ImageFormats.PNG.toString())) {
writePNG(wmsResponse, output, img, pixelSize);
wmsResponse.setResponseCode(200);
LOGGER.debug("PNG written to the output stream.");
} else if (format.equalsIgnoreCase(ImageFormats.TIFF.toString())) {
writeTIFF(wmsResponse, output, img, pixelSize);
LOGGER.debug("TIFF written to the output stream.");
wmsResponse.setResponseCode(200);
} else {
WMS.exceptionDescription(
wmsResponse,
output,
"The format requested is invalid. "
+ "Please check the server capabilities to ask for a supported format.");
}
}
/**
* This method permits to write the result image from the wms request in a png format
*
* @param wmsResponse The object used later to build the HTTP response.
* @param output The output stream
* @param img The output image
* @param pixelSize The size of the pixels.
* @throws IOException
*/
private static void writePNG(
WMSResponse wmsResponse, OutputStream output, BufferedImage img, double pixelSize)
throws IOException {
wmsResponse.setContentType(ImageFormats.PNG.toString());
int dpm = (int) (1000 / pixelSize + 1);
PNGEncodeParam pEnc = PNGEncodeParam.getDefaultEncodeParam(img);
pEnc.setPhysicalDimension(dpm, dpm, 1);
JAI.create("Encode", img, output, "PNG", pEnc);
output.close();
}
