Problem with DOM LS serialization

On Fri, Feb 1, 2013 at 3:26 PM, <Michael.Hedenus-EXT at continental-corporation.com> wrote: > Dear All, > > unfortunately I cannot serialize items using DOM/LS. > I get an NullPointerException because Node.getParentNode() returns null. > > Here's the use-case: > > > > public class Test > { > public static void main(String[] args) throws Exception > { > System.setProperty("org.basex.path", > "D:\\ODX-Development-Neu\\odx-workspace\\.database"); > Context context = new Context(); > > try > { > // > // open DB and query an item > // > new Open("vag").execute(context); > QueryProcessor queryProcessor = new > QueryProcessor("//BASE-VARIANT[SHORT-NAME='BV_EnginContrModul1UDS']", > context); > Item item = queryProcessor.iter().next(); > > // > // serialize item, proofs that result is here > // > Serializer serializer = > queryProcessor.getSerializer(System.out); > > // can the queryProcessor be closed here? > queryProcessor.close(); > > serializer.serialize(item); > serializer.close(); > > // > // write with DOM fails!!! > // > org.w3c.dom.Node node = > (org.w3c.dom.Node)item.toJava(); > > DOMImplementationLS domImplementationLS = > (DOMImplementationLS)DOMImplementationRegistry.newInstance().getDOMImplementation("LS"); > LSOutput lsOutput = > domImplementationLS.createLSOutput(); > lsOutput.setByteStream(System.out); > LSSerializer lsSerializer = > domImplementationLS.createLSSerializer(); > > lsSerializer.getDomConfig().setParameter("format-pretty-print", > Boolean.TRUE); > lsSerializer.write(node, lsOutput); > > } > finally > { > context.close(); > } > } > } > > > And the exception: > > Caused by: java.lang.NullPointerException > at > com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.prepareForSerialization(DOMSerializerImpl.java:1064) > at > com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.write(DOMSerializerImpl.java:747) > ... 1 more > > > I am using the latest snapshot: BaseX76-20130131.202759 > > > Can you help me? > > > > Mit freundlichen Grüßen/Best regards > Dr. Michael Hedenus > Software Developer > Powertrain Engine Systems CSW ETV RGB T2 > PIXEL GmbH > Im Gewerbepark C15, 93059 Regensburg, Germany > > Telefon/Phone: +49 941 790-6362 > Telefax: +49 941 79013-90771 > E-Mail: michael.hedenus-ext at continental-corporation.com > www.continental-corporation.com > ______________________________________________________________________ > Continental Automotive GmbH, Siemensstr. 12, 93055 Regensburg, Germany > Geschäftsführer/Managing Directors: Helmut Matschi, Gérard Cordonnier, > Harald Stuhlmann > Sitz der Gesellschaft/Registered office: Hannover > Registergericht/Commercial registry: Hannover, HRB 59424, USt-Id. Nr. > DE814950663 > _______________________________________________________________________ > Proprietary and confidential. Distribution only by express authority of > Continental AG or its > subsidiaries. > > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >

On Fri, Feb 1, 2013 at 6:36 PM, Christian Grün <christian.gruen at gmail.com> wrote: > Dear Michael, > > could you provide us with a small, self-contained example that allows > us to reproduce the bug? > > Thanks; greetings to my home town, > Christian > ___________________________ > > Dr. Christian Grün > Box 188, Uni KN > D-78457 Konstanz > http://christian-gruen.de > > > > On Fri, Feb 1, 2013 at 3:26 PM, > <Michael.Hedenus-EXT at continental-corporation.com> wrote: >> Dear All, >> >> unfortunately I cannot serialize items using DOM/LS. >> I get an NullPointerException because Node.getParentNode() returns null. >> >> Here's the use-case: >> >> >> >> public class Test >> { >> public static void main(String[] args) throws Exception >> { >> System.setProperty("org.basex.path", >> "D:\\ODX-Development-Neu\\odx-workspace\\.database"); >> Context context = new Context(); >> >> try >> { >> // >> // open DB and query an item >> // >> new Open("vag").execute(context); >> QueryProcessor queryProcessor = new >> QueryProcessor("//BASE-VARIANT[SHORT-NAME='BV_EnginContrModul1UDS']", >> context); >> Item item = queryProcessor.iter().next(); >> >> // >> // serialize item, proofs that result is here >> // >> Serializer serializer = >> queryProcessor.getSerializer(System.out); >> >> // can the queryProcessor be closed here? >> queryProcessor.close(); >> >> serializer.serialize(item); >> serializer.close(); >> >> // >> // write with DOM fails!!! >> // >> org.w3c.dom.Node node = >> (org.w3c.dom.Node)item.toJava(); >> >> DOMImplementationLS domImplementationLS = >> (DOMImplementationLS)DOMImplementationRegistry.newInstance().getDOMImplementation("LS"); >> LSOutput lsOutput = >> domImplementationLS.createLSOutput(); >> lsOutput.setByteStream(System.out); >> LSSerializer lsSerializer = >> domImplementationLS.createLSSerializer(); >> >> lsSerializer.getDomConfig().setParameter("format-pretty-print", >> Boolean.TRUE); >> lsSerializer.write(node, lsOutput); >> >> } >> finally >> { >> context.close(); >> } >> } >> } >> >> >> And the exception: >> >> Caused by: java.lang.NullPointerException >> at >> com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.prepareForSerialization(DOMSerializerImpl.java:1064) >> at >> com.sun.org.apache.xml.internal.serialize.DOMSerializerImpl.write(DOMSerializerImpl.java:747) >> ... 1 more >> >> >> I am using the latest snapshot: BaseX76-20130131.202759 >> >> >> Can you help me? >> >> >> >> Mit freundlichen Grüßen/Best regards >> Dr. Michael Hedenus >> Software Developer >> Powertrain Engine Systems CSW ETV RGB T2 >> PIXEL GmbH >> Im Gewerbepark C15, 93059 Regensburg, Germany >> >> Telefon/Phone: +49 941 790-6362 >> Telefax: +49 941 79013-90771 >> E-Mail: michael.hedenus-ext at continental-corporation.com >> www.continental-corporation.com >> ______________________________________________________________________ >> Continental Automotive GmbH, Siemensstr. 12, 93055 Regensburg, Germany >> Geschäftsführer/Managing Directors: Helmut Matschi, Gérard Cordonnier, >> Harald Stuhlmann >> Sitz der Gesellschaft/Registered office: Hannover >> Registergericht/Commercial registry: Hannover, HRB 59424, USt-Id. Nr. >> DE814950663 >> _______________________________________________________________________ >> Proprietary and confidential. Distribution only by express authority of >> Continental AG or its >> subsidiaries. >> >> _______________________________________________ >> BaseX-Talk mailing list >> BaseX-Talk at mailman.uni-konstanz.de >> https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >>

> thank you for quickly attacking the problem! But sorry, but the problem is not fixed.I get the same error.

> [...] > I propose to add a standard SAX serializer to BaseX. This would be a very useful extension. > > Here is my implementation:

> import static org.basex.util.Token.XMLNS; > import static org.basex.util.Token.startsWith; > import static org.basex.util.Token.string; > import static org.basex.util.Token.substring; > > import java.io.IOException; > import java.util.HashMap; > import java.util.Map; > > import org.basex.io.serial.Serializer; > import org.basex.query.value.item.Item; > import org.xml.sax.ContentHandler; > import org.xml.sax.DTDHandler; > import org.xml.sax.EntityResolver; > import org.xml.sax.ErrorHandler; > import org.xml.sax.InputSource; > import org.xml.sax.SAXException; > import org.xml.sax.SAXNotRecognizedException; > import org.xml.sax.SAXNotSupportedException; > import org.xml.sax.XMLReader; > import org.xml.sax.ext.LexicalHandler; > import org.xml.sax.helpers.AttributesImpl; > > /** > * Bridge to translate BaseX items to SAX events. > * The parse() methods does the following: > * <ol> > * <li>notify startDocument()</li> > * <li>serialize the item</li> > * <li>notify endDocument()</li> > */ > public class FragmentSerializer extends Serializer implements XMLReader > { > /** > * The item to be serialized > */ > private Item item; > > private ContentHandler contentHandler; > private EntityResolver entityResolver; > private DTDHandler dtdHandler; > private ErrorHandler errorHandler; > private LexicalHandler lexicalHandler; > > public FragmentSerializer() > { > } > > public Item getItem() > { > return item; > } > > /** > * Sets the item to be serialized. > */ > public void setItem(Item item) > { > this.item = item; > } > > ////////////////////////////////////////////////// > // XMLReader > ////////////////////////////////////////////////// > > @Override > public ContentHandler getContentHandler() > { > return contentHandler; > } > > @Override > public boolean getFeature(final String name) > { > return false; > } > > @Override > public Object getProperty(final String name) > { > return null; > } > > public void parse() throws SAXException > { > parse(""); > } > > @Override > public void parse(final InputSource input) throws SAXException > { > parse(""); > } > > @Override > public void parse(final String id) throws SAXException > { > try > { > contentHandler.startDocument(); > item.serialize(this); > contentHandler.endDocument(); > } > catch (final Exception ex) > { > throw new SAXException(ex); > } > } > > @Override > public void setContentHandler(final ContentHandler c) > { > contentHandler = c; > } > > public void setLexicalHandler(final LexicalHandler l) > { > lexicalHandler = l; > } > > @Override > public void setEntityResolver(EntityResolver entityResolver) > { > this.entityResolver = entityResolver; > } > > @Override > public EntityResolver getEntityResolver() > { > return entityResolver; > } > > @Override > public void setDTDHandler(DTDHandler dtdHandler) > { > this.dtdHandler = dtdHandler; > } > > @Override > public DTDHandler getDTDHandler() > { > return dtdHandler; > } > > @Override > public void setErrorHandler(ErrorHandler errorHandler) > { > this.errorHandler = errorHandler; > } > > @Override > public ErrorHandler getErrorHandler() > { > return errorHandler; > } > > @Override > public void setFeature(final String name, final boolean value) throws SAXNotRecognizedException, SAXNotSupportedException > { > throw new SAXNotRecognizedException(); > } > > @Override > public void setProperty(final String name, final Object value) throws SAXNotRecognizedException, SAXNotSupportedException > { > throw new SAXNotRecognizedException(); > } > > ////////////////////////////////////////////////// > // Serializer > ////////////////////////////////////////////////// > > private final HashMap<String, String> attributes = new HashMap<String, String>(); > private NSDecl namespaces; > > @Override > protected void startOpen(byte[] n) throws IOException > { > attributes.clear(); > this.namespaces = new NSDecl(this.namespaces); > } > > @Override > protected void attribute(byte[] n, byte[] v) throws IOException > { > String value = string(v); > > String prefix = null; > if (startsWith(n, XMLNS)) > { > if (n.length == 5) > { > prefix = ""; > } > else if (n[5] == ':') > { > prefix = string(substring(n, 6)); > } > } > > if (prefix != null) > { > namespaces.put(prefix, value); > } > else > { > String name = string(n); > attributes.put(name, value); > } > } > > @Override > protected void finishOpen() throws IOException > { > try > { > AttributesImpl attrs = new AttributesImpl(); > for (Map.Entry<String, String> e : attributes.entrySet()) > { > String rname = e.getKey(); > String[] qname = qname(rname); > String ns = namespaces.get(qname[0]); > String lname = qname[1]; > attrs.addAttribute(ns, lname, rname, null, e.getValue()); > } > > String rname = string(elem); > String[] qname = qname(rname); > String ns = namespaces.get(qname[0]); > String lname = qname[1]; > contentHandler.startElement(ns, lname, rname, attrs); > > // System.out.println("{" + ns + "}" + lname); > // for (int i = 0; i < attrs.getLength(); i++) > // { > // System.out.println(" {" + attrs.getURI(i) + "}" + attrs.getLocalName(i) + "=" + attrs.getValue(i)); > // } > } > catch (final SAXException e) > { > throw new IOException(e.getMessage()); > } > } > > public String[] qname(String rname) > { > String prefix = ""; > String lname = rname; > > int i = rname.indexOf(':'); > if (i > 0) > { > prefix = rname.substring(0, i); > lname = rname.substring(i + 1); > } > return new String[] { prefix, lname }; > } > > @Override > protected void finishEmpty() throws IOException > { > finishOpen(); > finishClose(); > } > > @Override > protected void finishClose() throws IOException > { > try > { > String name = string(elem); > contentHandler.endElement("", name, name); > this.namespaces = namespaces.getParent(); > } > catch (final SAXException e) > { > throw new IOException(e.getMessage()); > } > } > > @Override > protected void finishText(byte[] text) throws IOException > { > try > { > String s = string(text); > final char[] c = s.toCharArray(); > contentHandler.characters(c, 0, c.length); > } > catch (final SAXException e) > { > throw new IOException(e.getMessage()); > } > } > > @Override > protected void finishComment(byte[] comment) throws IOException > { > if (lexicalHandler != null) > { > try > { > String s = string(comment); > final char[] c = s.toCharArray(); > lexicalHandler.comment(c, 0, c.length); > } > catch (final SAXException e) > { > throw new IOException(e.getMessage()); > } > } > } > > @Override > protected void finishPi(byte[] n, byte[] v) throws IOException > { > //ignored > } > > @Override > protected void atomic(Item i) throws IOException > { > //ignored > } > } > > class NSDecl > { > private final NSDecl parent; > private Map<String, String> decls; > > public NSDecl(NSDecl parent) > { > this.parent = parent; > } > > public NSDecl getParent() > { > return parent; > } > > public void put(String prefix, String uri) > { > if (decls == null) > { > decls = new HashMap<String, String>(); > } > decls.put(prefix, uri); > } > > public String get(String prefix) > { > String ns = null; > for (NSDecl c = this; c != null; c = c.parent) > { > if (c.decls != null) > { > ns = c.decls.get(prefix); > if (ns != null) > { > break; > } > } > } > return ns != null ? ns : ""; > } > } > _______________________________________________ > BaseX-Talk mailing list > BaseX-Talk at mailman.uni-konstanz.de > https://mailman.uni-konstanz.de/mailman/listinfo/basex-talk >