/**
* Writes the XML Declaration and the opening RDF tag to the print Writer. Encoding attribute is
* specified as the encoding argument.
*
* @param out PrintWriter
* @throws IOException
*/
protected void writeHeader(OutputStreamWriter out) throws IOException {
// validate
if (out != null) {
// wrapper for output stream writer (enable autoflushing)
PrintWriter writer = new PrintWriter(out, true);
// get encoding from the Encoding map
String encoding = EncodingMap.getJava2IANAMapping(out.getEncoding());
// only insert encoding if there is a value
if (encoding != null) {
// print opening tags <?xml version="1.0" encoding=*encoding*?>
writer.println("<?xml version=\"1.0\" encoding=\"" + encoding + "\"?>");
} else {
// print opening tags <?xml version="1.0"?>
writer.println("<?xml version=\"1.0\"?>");
}
// print the Entities
this.writeXMLEntities(writer);
// print the opening RDF tag (including namespaces)
this.writeRDFHeader(writer);
} else {
throw new IllegalArgumentException("Cannot write to null Writer.");
}
}
