Re: org.openjena.riot.RiotException: Bad input stream (Nquads)

[Andy Seaborne]

On 22/09/11 16:21, Laurent Pellegrino wrote:
Hi all,
I am trying to parse a N-Quads file by using the following code:

     static int line = 0;

     public static void main(String[] args) {

         Sink<Quad>  sink = new Sink<Quad>() {
             @Override
             public void send(final Quad quad) {
                 log.info("line=" + line + ", quad=" + quad);
                 line++;
             }

             @Override
             public void close() {
             }

             @Override
             public void flush() {
             }
         };

         FileInputStream fis = null;

         LangRIOT parser = null;
         try {
             fis = new FileInputStream("/absolute/path/to/nquads-chunk");
             parser = RiotReader.createParserNQuads(fis, sink);
         } catch (FileNotFoundException e) {
             e.printStackTrace();
         } finally {
             try {
                 fis.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

         parser.parse();
     }

the file nquads-chun is available from:

http://commondatastorage.googleapis.com/nquads/nquads-chunk

When I run the parser, I get:

Exception in thread "main" org.openjena.riot.RiotException: [line:
574, col: 62] Bad input stream
        at 
org.openjena.riot.ErrorHandlerFactory$ErrorHandlerStd.fatal(ErrorHandlerFactory.java:110)
        at org.openjena.riot.lang.LangEngine.raiseException(LangEngine.java:157)
        at org.openjena.riot.lang.LangEngine.nextToken(LangEngine.java:104)
        at org.openjena.riot.lang.LangNQuads.parseOne(LangNQuads.java:62)
        at org.openjena.riot.lang.LangNQuads.parseOne(LangNQuads.java:22)
        at org.openjena.riot.lang.LangNTuple.runParser(LangNTuple.java:58)
        at org.openjena.riot.lang.LangBase.parse(LangBase.java:42)

where line 574 seems to be:

<http://my.opera.com/carlOS%20X/xml/foaf#me>
<http://xmlns.com/foaf/0.1/knows>
<http://my.opera.com/allegro_noise/xml/foaf#me>
<http://my.opera.com/carlOS%20X/xml/foaf>  .

which seems to respect the NQuads syntax correctly? any idea?

Kind Regards,

Laurent

Laurent,

The work of the parser is done in parser.parse()

You've closed the input stream before the parser is called in the 
try-finally block.

Try moving parser.parse(); inside the try{}

            parser = RiotReader.createParserNQuads(fis, sink);
            parser.parse();

It gets someway because of the heavy read-ahead when the tokenizer is 
started.

(error could be improved - the underlying error I get is "bad file 
descriptor" but that's on Linux).

        Andy