Examples of org.apache.jena.riot.Lang

org.apache.jena.riot.Lang
A "language" (syntax). A language has a name, some alternative names, a content type, some alternative content types, and a list of associated file extensions. Names, content types and file extensions must be unique to one language. To create a Lang constant, use {@link LangBuilder} and register with {@link RDFLanguages}.

    }
    
    private static void incomingData(HttpAction action, StreamRDF dest) {
        String base = wholeRequestURL(action.request) ;
        ContentType ct = FusekiLib.getContentType(action) ;
        Lang lang = WebContent.contentTypeToLang(ct.getContentType()) ;
        if ( lang == null ) {
            errorBadRequest("Unknown content type for triples: " + ct) ;
            return ;
        }
        InputStream input = null ;
        try { input = action.request.getInputStream() ; } 
        catch (IOException ex) { IO.exception(ex) ; }
    
        int len = action.request.getContentLength() ;
        if ( action.verbose ) {
            if ( len >= 0 )
                log.info(format("[%d]   Body: Content-Length=%d, Content-Type=%s, Charset=%s => %s", action.id, len,
                                ct.getContentType(), ct.getCharset(), lang.getName())) ;
            else
                log.info(format("[%d]   Body: Content-Type=%s, Charset=%s => %s", action.id, ct.getContentType(),
                                ct.getCharset(), lang.getName())) ;
        }
    
        parse(action, dest, input, lang, base) ;
    }

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        {
            contentType = WebContent.contentTypeTextPlain ;
            charset = WebContent.charsetUTF8 ;
        }


        Lang lang = WebContent.contentTypeToLang(contentType) ;
        if ( lang == null )
            errorBadRequest("Can't determine output content type: "+contentType) ;
        
//        if ( rdfw instanceof RDFXMLWriterI )
//            rdfw.setProperty("showXmlDeclaration", "true") ;

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            String filename = getValue(argFile) ;
            log.info("Dataset: in-memory: load file: "+filename) ;
            if ( ! FileOps.exists(filename) )
                throw new CmdException("File not found: "+filename) ;


            Lang language = RDFLanguages.filenameToLang(filename) ;
            if ( language == null )
                throw new CmdException("Can't guess language for file: "+filename) ;
            InputStream input = IO.openFile(filename) ; 
            
            if ( RDFLanguages.isQuads(language) )

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            error(HttpSC.UNSUPPORTED_MEDIA_TYPE_415, "multipart/mixed not supported") ;
            return null ;
        }


        int len = action.request.getContentLength() ;
        Lang lang = WebContent.contentTypeToLang(ct.getContentType()) ;
        if ( lang == null )
        {
            errorBadRequest("Unknown content type for triples: "+contentTypeHeader) ;
            return null ;
        }


        if ( action.verbose )
        {
            if ( len >= 0 )
                log.info(format("[%d]   Body: Content-Length=%d, Content-Type=%s, Charset=%s => %s", 
                                      action.id, len, ct.getContentType(), ct.getCharset(), lang.getName())) ;
            else
                log.info(format("[%d]   Body: Content-Type=%s, Charset=%s => %s", 
                                          action.id, ct.getContentType(), ct.getCharset(), lang.getName())) ;
        }
        
        try {
            InputStream input = action.request.getInputStream() ;
            boolean buffering = false ;

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    {
        if ( false )
        {
            for ( String url : urls )
            {
                Lang lang = RDFLanguages.filenameToLang(url) ;
                if ( lang != null && RDFLanguages.isQuads(lang) )
                    throw new TDBException("Not a triples language") ;
            }
        }

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        {
            contentType = WebContent.contentTypeTextPlain ;
            charset = WebContent.charsetUTF8 ;
        }


        Lang lang = WebContent.contentTypeToLang(contentType) ; 
        RDFWriter rdfw = FusekiLib.chooseWriter(lang) ;


        if ( rdfw instanceof RDFXMLWriterI )
            rdfw.setProperty("showXmlDeclaration", "true") ;

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//        if ( false ) 
//            SetupTDB.makeNodeTable(location, locationString, 0, outputFile, 0) ;


        for( String filename : datafiles)
        {
            Lang lang = RDFLanguages.filenameToLang(filename, RDFLanguages.NQUADS) ;
            if ( lang == null )
                // Does not happen due to default above.
                cmdError("File suffix not recognized: " +filename) ;
            if ( ! FileOps.exists(filename) )
                cmdError("File does not exist: "+filename) ;

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    {
        // Yes - we ignore the charset.
        // Either it's XML and so the XML parser deals with it, or the 
        // language determines the charset and the parsers offer InputStreams.   
       
        Lang lang = WebContent.contentTypeToLang(ts.getContentType()) ;
        if ( lang == null )
            throw new RiotException("Unknown lang for "+ts.getMediaType()) ;
        RDFDataMgr.read(graph, ts, lang) ; 
    }

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    {
        // Yes - we ignore the charset.
        // Either it's XML and so the XML parser deals with it, or the 
        // language determines the charset and the parsers offer InputStreams.   
       
        Lang lang = WebContent.contentTypeToLang(ts.getContentType()) ;
        if ( lang == null )
            throw new FusekiException("Unknown lang for "+ts.getMediaType()) ;
        RDFDataMgr.read(graph, base, lang) ;
    }

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            String filename = getValue(argFile) ;
            log.info("Dataset: in-memory: load file: "+filename) ;
            if ( ! FileOps.exists(filename) )
                throw new CmdException("File not found: "+filename) ;


            Lang language = RDFLanguages.filenameToLang(filename) ;
            if ( language == null )
                throw new CmdException("Can't guess language for file: "+filename) ;
            InputStream input = IO.openFile(filename) ; 
            
            if ( RDFLanguages.isQuads(language) )

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