Kumar, we told you that it does not work if you write to another file and use RDF/XML format. The file will be overwritten. Do you understand?
You have to read the target file as model and add the data to this model and write this model to the same file. > I dont know if attaching screen shot is allowed or not, but kindly if > you can check it. > > After running the code , it has added the garbage classes to the file. > User class is also there as I have created it, but again it has > disappeared my classes in ontology. > > *Note:* I have added new class in the same file I have read it and > used the same namespace of the ontology for new class (User class). > My ontology uri is : *String > ns="http://www.semanticweb.org/ontologies/2016/7/untitled-54/";* > * > * > And I used this for *User* class also. > > On Fri, Jul 22, 2016 at 2:47 AM, Dave Reynolds > <[email protected] <mailto:[email protected]>> wrote: > > On 22/07/16 10:44, kumar rohit wrote: > > Yes because the model.write() works but the FileWriter does > not. I also > tried something like this to append data but failed: > > FileOutputStream f1=new FileOutputStream(file, *true*); > > Any solution please you suggest to write it to the same file I > have read > from? > > > You can't, at least not in RDF/XML format. > > As Lorenz says, you would have to read in the current file, add > your new assertions, then write out the whole file again. > > > Dave > > On Fri, Jul 22, 2016 at 2:22 AM, Lorenz B. < > [email protected] > <mailto:[email protected]>> wrote: > > Hello Dave, > > I think the problem is that he writes to another file - > and I guess this > one already contains some data. Of course the write method > cannot append > data, but just overwrites the file. Am I right? Anything > else would > sound like some magic. > > Otherwise, to append data, one would have to load it into > a separate > model and add data directly to this model. > > > > Kind regards, > Lorenz > > On 22/07/16 09:58, kumar rohit wrote: > > The main() pass the required file and then just > the GUI loads because we > have to deal with a text field where user enter > his name and we will > create > individual of that name. > > The main purpose of this code is to create > individual (after user > enter the > name) and store it locally in a file *(either a > separate file or to the > file we have read **InputStream in > =FileManager.get().open(file);*) > > It writes the required result to the > console(model.write method) but > when I > try to write it in a file, it just remove all the > data from the > destination > file and even the ontology URI. > > For writing to a file, I used these both methods > but both does not work. > > (1) FileWriter out = new FileWriter( fileName ); > > try { > model.write( out, "RDF/XML-ABBREV" );} > > 2) FileOutputStream out=new > FileOutputStream(filename); > RDFWriter d = > model.getWriter("RDF/XML-ABBREV"); > d.write(model,out,null); > }catch(Exception e) {} > > > > Make sure you close the stream, that's probably the > source of your > random loss of output. > > The reason you see Seq and other such junk is because > you are writing > the whole model, with inference, and a default > OntModel includes RDFS > inference. Use model.write which for an OntModel > defaults to writing > just the base model. Also, unless you need inference > use an explicit > OntModelSpec which doesn't have any (e.g. OWL_MEM). > > Dave > > On Fri, Jul 22, 2016 at 12:30 AM, Lorenz B. < > [email protected] > <mailto:[email protected]>> wrote: > > 1.) This is not a minimal running example! > that means, nobody can test > it without some (in your case too much) effort > to get it running. > 2.) w.r.t. 1), look at your main() method, it > reads a file and then? > 2.) Please tell us exactly WHAT does not work > and WHAT you expect. > 3.) The OntModel object has a method write, > not sure what you did there > with calling getWriter and the like > > *When I run this program without writing > it to the file, it runs > > smoothly. > > But when I copy it to a file (both newly > created and existing file), > sometime it adds the garbage claases to > the file like Seq, Bag, > Resource > and most of the time it does nothing > except it empties the destination > file.* > > *I have copied the whole code except the > code auto generated by > netbeans* > > > > > > *public class NewJFrame extends > javax.swing.JFrame {* > > > > > > > * public static void > readOntology(String file,OntModel model)* > > * {* > > > * InputStream in > =FileManager.get().open(file);* > > > > *if (in==null) {* > > *throw new IllegalArgumentException( > "File: " + file + " not > found");* > > *}* > > * model.read(in,null);* > > * //in.close();}}* > > > > private void read1(String str, > OntModel model) > > { > > > > > > > > String ns=" > > http://www.semanticweb.org/ontologies/untitled-ontology-54/";; > > > OntClass user = > model.createClass(ns + "User"); > > > > > > OntClass user1 = > model.getOntClass(ns + "User"); > > Individual janeSmith = > user1.createIndividual(ns + str) > > > > try { > > String > file="F://newontology.owl"; > > > > > > FileOutputStream f1=new > FileOutputStream(file); > > RDFWriter d = > model.getWriter("RDF/XML-ABBREV"); > > d.write(model,f1,null); > > }catch(Exception e) {} > > > *private void > jButton1ActionPerformed(java.awt.event.ActionEvent > evt) { > * > > > > *OntModel > model=ModelFactory.createOntologyModel();* > > > * String str=jTextField2.getText()* > > > > * read1(str, model); }}* > > > > * public static void main(String args[]) {* > > > > > > > > * OntModel model = > ModelFactory.createOntologyModel();* > > * String > file="F://updated.owl";* > > * readOntology(file , model );* > > *}* > > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research > center > > > > > -- > Lorenz Bühmann > AKSW group, University of Leipzig > Group: http://aksw.org - semantic web research center > > > > -- Lorenz Bühmann AKSW group, University of Leipzig Group: http://aksw.org - semantic web research center
