On 26/10/2021 09:40, Martynas Jusevičius wrote:
Hi,
I'm implementing a Reader that extracts <script
type="application/ld+json"> from HTML and then uses JsonLDReader to
parse that data.
I've got a few questions in the process:
1. How does one obtain the default ParserProfile and ErrorHandler?
Currently I'm using
ParserProfile profile =
RiotLib.profile(HtmlJsonLDReaderFactory.HTML, null,
ErrorHandlerFactory.getDefaultErrorHandler());
Use
RDFParser.create()... parse(stream);
then don't call .factory() .errorHandler() on the RDFParserBuilder and
the defaults will be used.
but internally the method it calls are all deprecated.
2. Can multiple StreamRDF be combined into one?
A single StreamRDF can be reused unless it documents otherwise. A graph
sink can be used multiple times.
There might be
multiple <script> elements and the reader should merge the data from
them. I attempted
public void read(Reader in, String baseURI, Lang lang, StreamRDF
output, Context context)
{
...
for (Element element : jsonLdElements)
{
String jsonLd = element.data();
getJsonLDReader().read(new StringReader(jsonLd), baseURI,
JSONLD.getContentType(), output, context);
}
}
but only the first element gets read,
I guess because
getJsonLDReader().read() calls output.start()/output.finish().
Unlikely - .start/.finish can be called multiple times (unless the
StreamRDF explicitly documents otherwise - a graph sink can be used
multiple times.
Andy
Full Reader code:
https://github.com/AtomGraph/LinkedDataHub/blob/html-jsonld-reader/src/main/java/com/atomgraph/linkeddatahub/io/HtmlJsonLDReader.java#L73
Martynas
