com.xmlcalabash.extensions.RDFLoad Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of xmlcalabash1-rdf Show documentation
XML Calabash extension steps to load/query RDF
The newest version!
package com.xmlcalabash.extensions;

import com.hp.hpl.jena.rdf.model.StmtIterator;
import com.hp.hpl.jena.sparql.util.Context;
import com.xmlcalabash.core.XMLCalabash;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.runtime.XAtomicStep;
import com.xmlcalabash.util.XProcURIResolver;
import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.XdmNode;
import org.apache.jena.riot.Lang;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.riot.ReaderRIOT;
import org.apache.jena.riot.RiotReader;
import org.apache.jena.riot.lang.LangRIOT;
import org.apache.jena.riot.system.ErrorHandler;
import org.apache.jena.riot.system.ParserProfile;
import org.apache.jena.riot.system.RiotLib;
import org.apache.jena.riot.system.StreamRDF;
import org.apache.jena.riot.system.StreamRDFLib;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.InputSource;

import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.URIResolver;
import javax.xml.transform.sax.SAXSource;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;

/**
 * Created by IntelliJ IDEA.
 * User: ndw
 * Date: Oct 8, 2008
 * Time: 7:44:07 AM
 * To change this template use File | Settings | File Templates.
 */

@XMLCalabash(
        name = "cx:rdf-load",
        type = "{http://xmlcalabash.com/ns/extensions}rdf-load")

public class RDFLoad extends RDFStep {
    /**
     * Creates a new instance of Identity
     * @param runtime The XProc runtime
     * @param step The step
     */
    public RDFLoad(XProcRuntime runtime, XAtomicStep step) {
        super(runtime, step);
    }

    public void run() throws SaxonApiException {
        super.run();

        while (source.moreDocuments()) {
            XdmNode doc = source.read();
            loadRdf(dataset, doc);
        }

        String href = getOption(_href).getString();
        String graphName = getOption(_graph, (String) null);

        Lang lang = getLanguage(href);
        if (lang == null) {
            throw new XProcException("Could not deduce language for RDFLoad data.");
        }

        Iterator graphNameIter = null;
        StmtIterator statementIter = null;

        try {
            URI baseURI = step.getNode().getBaseURI();
            URL url = baseURI.resolve(href).toURL();
            URLConnection conn = url.openConnection();

            ReaderRIOT reader = RDFDataMgr.createReader(lang);
            StreamRDF dest = StreamRDFLib.dataset(dataset.asDatasetGraph());
            ErrorHandler handler = new ParserErrorHandler(href);
            ParserProfile prof = RiotLib.profile(lang, href, handler);
            Context context = new Context();

            reader.setErrorHandler(handler);
            reader.setParserProfile(prof);

            reader.read(conn.getInputStream(), href, lang.getContentType(), dest, context);
            conn.getInputStream().close();
        } catch (MalformedURLException e) {
            throw new XProcException(e);
        } catch (IOException e) {
            throw new XProcException(e);
        }

        if (graphName == null) {
            statementIter = dataset.getDefaultModel().listStatements();
            dumpStatements(statementIter, null);

            graphNameIter = dataset.listNames();
            while (graphNameIter.hasNext()) {
                String collection = graphNameIter.next();
                statementIter = dataset.getNamedModel(collection).listStatements();
                dumpStatements(statementIter, collection);
            }
        } else {
            statementIter = dataset.getNamedModel(graphName).listStatements();
            dumpStatements(statementIter, graphName);
        }
    }

    public static void configureStep(XProcRuntime runtime) {
        XProcURIResolver resolver = runtime.getResolver();
        URIResolver uriResolver = resolver.getUnderlyingURIResolver();
        URIResolver myResolver = new StepResolver(uriResolver);
        resolver.setUnderlyingURIResolver(myResolver);
    }

    private static class StepResolver implements URIResolver {
        Logger logger = LoggerFactory.getLogger(RDFLoad.class);
        URIResolver nextResolver = null;

        public StepResolver(URIResolver next) {
            nextResolver = next;
        }

        @Override
        public Source resolve(String href, String base) throws TransformerException {
            try {
                URI baseURI = new URI(base);
                URI xpl = baseURI.resolve(href);
                if (library_xpl.equals(xpl.toASCIIString())) {
                    URL url = RDFLoad.class.getResource(library_url);
                    logger.debug("Reading library.xpl for cx:rdf-load from " + url);
                    InputStream s = RDFLoad.class.getResourceAsStream(library_url);
                    if (s != null) {
                        SAXSource source = new SAXSource(new InputSource(s));
                        return source;
                    } else {
                        logger.info("Failed to read " + library_url + " for cx:rdf-load");
                    }
                }
            } catch (URISyntaxException e) {
                // nevermind
            }

            if (nextResolver != null) {
                return nextResolver.resolve(href, base);
            } else {
                return null;
            }
        }
    }
}