/** {@inheritDoc} */
@Override
protected int output(final OutputStream stream) throws IOException {
final CountingOutputStream cout = new CountingOutputStream(stream);
final Writer writer = PDFDocument.getWriterFor(cout);
if (hasObjectNumber()) {
writer.write(getObjectID());
}
writer.write(toString());
if (hasObjectNumber()) {
writer.write("\nendobj\n");
}
writer.flush();
return cout.getCount();
}
/**
* Sets up PDF encryption if PDF encryption is requested by registering a <code>
* PDFEncryptionParams</code> object with the user agent and if the necessary cryptographic
* support is available.
*
* @param params the PDF encryption params or null to disable encryption
* @param pdf the PDF document to setup encryption for
*/
public static void setupPDFEncryption(PDFEncryptionParams params, PDFDocument pdf) {
if (pdf == null) {
throw new NullPointerException("PDF document must not be null");
}
if (params != null) {
if (!checkAvailableAlgorithms()) {
if (isJCEAvailable()) {
log.warn(
"PDF encryption has been requested, JCE is "
+ "available but there's no "
+ "JCE provider available that provides the "
+ "necessary algorithms. The PDF won't be "
+ "encrypted.");
} else {
log.warn(
"PDF encryption has been requested but JCE is "
+ "unavailable! The PDF won't be encrypted.");
}
}
pdf.setEncryption(params);
}
}