EXIUtils.java

package org.exist.xquery.modules.exi;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.exist.storage.serializers.Serializer;
import org.exist.validation.internal.node.NodeInputStream;
import org.exist.xquery.XPathException;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.value.Item;
import org.exist.xquery.value.NodeValue;
import org.exist.xquery.value.Type;

public class EXIUtils {
	
	private static final Logger LOG = LogManager.getLogger(EXIUtils.class);
	
	protected static InputStream getInputStream(Item item, XQueryContext context) throws XPathException, MalformedURLException, IOException {
        if (item.getType() == Type.ANY_URI) {
            LOG.debug("Streaming xs:anyURI");

            // anyURI provided
            String url = item.getStringValue();

            // Fix URL
            if (url.startsWith("/")) {
                url = "xmldb:exist://" + url;
            }

            return new URL(url).openStream();   
        }
        else if (item.getType() == Type.ELEMENT || item.getType() == Type.DOCUMENT) {
            LOG.debug("Streaming element or document node");

            /*
            if (item instanceof NodeProxy) {
                NodeProxy np = (NodeProxy) item;
                String url = "xmldb:exist://" + np.getDocument().getBaseURI();
                LOG.debug("Document detected, adding URL " + url);
                streamSource.setSystemId(url);
            }
            */

            // Node provided
            Serializer serializer = context.getBroker().newSerializer();

            NodeValue node = (NodeValue) item;
            return new NodeInputStream(serializer, node);
        }
        else {
            LOG.error("Wrong item type " + Type.getTypeName(item.getType()));
            throw new XPathException("wrong item type " + Type.getTypeName(item.getType()));
        }
    }

}