I was away from this for a while, but got back to it today.
Here is my solution:
(Thanks for your help, by the way.)
public class RenderImages {
private static final Log log = LogFactory.getLog(RenderImages.class);
public static void generateRenderedImages(Datastore datastore,
InputStream inputStream,
String fileName,
ConversionHandler conversionHandler,
SystemProperties systemProperties,
Logger logger) {
int thumbnailHeight = systemProperties.getAsInteger("RENDER_THUMBNAIL_HEIGHT");
int thumbnailWidth = systemProperties.getAsInteger("RENDER_THUMBNAIL_WIDTH");
String contentTypePreview = systemProperties.get("RENDER_CONTENT_TYPE_PREVIEW");
String contentTypeThumbnail = systemProperties.get("RENDER_CONTENT_TYPE_THUMBNAIL");
try {
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
IOUtils.copy(inputStream, outputStream);
byte[] imageBytes = outputStream.toByteArray();
inputStream.close();
ImageSaveOptions imageSaveOptions = new ImageSaveOptions();
imageSaveOptions.setSaveFileType(ImageSaveOptions.JPEG);
imageSaveOptions.setPage(1);
ByteArrayOutputStream previewStream = conversionHandler.convertToImage(new ByteArrayInputStream(imageBytes),
fileName + ".pdf",
imageSaveOptions);
saveToDatabase(datastore, previewStream, contentTypePreview, fileName);
previewStream.close();
imageSaveOptions.setHeight(thumbnailHeight);
imageSaveOptions.setWidth(thumbnailWidth);
ByteArrayOutputStream thumbnailStream = conversionHandler.convertToImage(
new ByteArrayInputStream(imageBytes),
fileName + ".pdf",
imageSaveOptions);
saveToDatabase(datastore, thumbnailStream, contentTypeThumbnail, fileName);
thumbnailStream.close();
} catch (Exception e) {
e.printStackTrace();
log.error("Image rendering failed); error = " + e.getMessage());
logger.writeLog("Image rendering failed); error = " + e.getMessage());
} finally {
// maybe need something here, not sure yet
}
}
private static void saveToDatabase(Datastore datastore,
ByteArrayOutputStream image, String contentType, String fileName) throws IOException {
RenderedImage renderedImage = datastore.find(RenderedImage.class)
.filter("attachmentId", fileName)
.filter("contentType", contentType)
.get();
if (renderedImage == null) {
renderedImage = new RenderedImage();
renderedImage.setAttachmentId(fileName);
renderedImage.setContentType(contentType);
renderedImage.setContent(image.toByteArray());
datastore.save(renderedImage);
}
}
}