The problem however with using variables is that eXist can only operate
on it's own persistent DOM implementation within the query. You need to
create a temporary document to pass to the XQuery. I hit this problem
when writing an extension function for processing the request as XML
(sent by an XForm) and wrote the following implementation:
package com.nps.xquery.request;
import org.exist.dom.QName;
import org.exist.http.servlets.RequestWrapper;
import org.exist.xquery.functions.request.RequestModule;
import org.exist.xquery.XQueryContext;
import org.exist.xquery.BasicFunction;
import org.exist.xquery.Cardinality;
import org.exist.xquery.FunctionSignature;
import org.exist.xquery.XPathException;
import org.exist.xquery.Variable;
import org.exist.xquery.value.Sequence;
import org.exist.xquery.value.SequenceType;
import org.exist.xquery.value.Type;
import org.exist.xquery.value.JavaObjectValue;
import org.exist.dom.NodeProxy;
import org.exist.dom.DocumentImpl;
import org.exist.dom.NodeImpl;
import org.exist.memtree.MemTreeBuilder;
import org.exist.memtree.DocumentBuilderReceiver;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;
public class DocFunction extends BasicFunction {
public final static FunctionSignature signature =
new FunctionSignature(
new QName("doc", Module.NAMESPACE_URI, Module.PREFIX),
"",
null,
new SequenceType(Type.NODE, Cardinality.ZERO_OR_ONE)
);
public DocFunction(XQueryContext context) {
super(context, signature);
}
public Sequence eval(Sequence[] arg0, Sequence arg1) throws
XPathException {
RequestModule requestModule =
(RequestModule) context.getModule(RequestModule.NAMESPACE_URI);
// request object is read from global variable $request
Variable var =
requestModule.resolveVariable(RequestModule.REQUEST_VAR);
if(var == null)
throw new XPathException("No request object found in the
current XQuery context.");
if (var.getValue().getItemType() != Type.JAVA_OBJECT)
throw new XPathException("Variable $request is not bound to
a Java object.");
JavaObjectValue value = (JavaObjectValue) var.getValue().itemAt(0);
if (value.getObject() instanceof RequestWrapper) {
RequestWrapper request = (RequestWrapper)value.getObject();
try {
MemTreeBuilder builder = context.getDocumentBuilder();
DocumentBuilderReceiver receiver = new
DocumentBuilderReceiver(builder);
SAXParserFactory factory = SAXParserFactory.newInstance();
factory.setNamespaceAware(true);
XMLReader reader = factory.newSAXParser().getXMLReader();
reader.setContentHandler(receiver);
reader.parse(new InputSource(request.getInputStream()));
DocumentImpl doc =
context.storeTemporaryDoc(builder.getDocument());
NodeImpl node =
(NodeImpl)doc.getDocumentElement().getFirstChild();
return new NodeProxy(doc, node.getGID(),
node.getInternalAddress());
}
catch (Exception e) {
throw new XPathException(getASTNode(), e.getMessage(), e);
}
} else
throw new XPathException("Variable $request is not bound to
a Request object.");
}
}
I think it should be possible to use such a temporary document as
context for the XQuery using XQueryService.query(XMLResource, String).
Jean-Baptiste Quenot wrote:
* Jonas Lundberg:
That might work, but it is not a good solution for me, although
it might work in other cases. My xqueries are very complex. But
this can't end here, can it? Is there really no way of returning
XML in a parameter from a flowscript in Cocoon?
Sitemap parameters are Strings, not Objects. You cannot pass a
DOM. However you can execute an XQuery without the
XQueryGenerator, Java snippet follows:
public static Node executeXQuery(Collection collection, Source
inputSource, Map variables, Logger logger) throws XMLDBException {
XQueryService service = (XQueryService) collection.getService(
"XQueryService", "1.0");
service.setProperty(Serializer.GENERATE_DOC_EVENTS, "false");
if (variables != null) {
if (logger != null) logger.debug("Executing " +
inputSource.getURI() + " with variables " + variables);
Iterator it = variables.entrySet().iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry)it.next();
service.declareVariable((String)entry.getKey(),
entry.getValue());
}
} else {
if (logger != null) logger.debug("Executing " +
inputSource.getURI());
}
ResourceSet result = service.execute(new
CocoonSource(inputSource, true));
if (result == null) {
if (logger != null) logger.error("null result after executing
XQuery!");
return null; // a DOM Node cannot be null so null can be
used safely for signaling errors
}
if (result.getSize() == 0) {
if (logger != null) logger.error("empty XML result after
executing XQuery!");
return null; // a DOM Node cannot be null so null can be
used safely for signaling errors
}
XMLResource resource = (XMLResource) result.getResource(0);
return resource.getContentAsDOM();
}
But I think the best solution in order to save directly an XML
document in the XML database is to use the XMLDBSource with
saveDocumentToSource("xmldb:exist://localhost:8080/exist/xmlrpc/db/file.xml",
document),
FlowScript snippet follows:
/*
* Save XML document to source.
* Parameters :
* outputMode : the desired output mode : 'html', 'xml', or 'text'
* Defaults to "xml"
*/
function saveDocumentToSource(source, document, outputMode ) {
var tf = Packages.javax.xml.transform.TransformerFactory.newInstance();
var outputStream = null;
// If no mode is specified, we use XML
if(! outputMode) {
outputMode = 'xml';
}
try {
if (source instanceof
Packages.org.apache.excalibur.source.ModifiableSource
&&
tf.getFeature(Packages.javax.xml.transform.sax.SAXTransformerFactory.FEATURE)) {
outputStream = source.getOutputStream();
var transformer = tf.newTransformer();
transformer.setOutputProperty(Packages.javax.xml.transform.OutputKeys.INDENT,
"yes");
transformer.setOutputProperty(Packages.javax.xml.transform.OutputKeys.METHOD,
outputMode);
transformer.transform(
new Packages.javax.xml.transform.dom.DOMSource(document),
new
Packages.javax.xml.transform.stream.StreamResult(outputStream));
} else {
throw new
Packages.org.apache.cocoon.ProcessingException("Cannot write to source " + uri);
}
} finally {
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
}
}
Best regards,
--
Met vriendelijke groet,
Suzan Foster
Software Engineer
*NEROC'MEDIAWARE *
De Run 1131
5503 LB Veldhoven
T +31 (0)40 258 66 66
F +31 (0)40 258 66 77
E [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
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