Re: [Vtd-xml-users] XMLModifier remove all elements of type 'x'

[<al...@sa...>]

This code will find and delete the notes/elements you want.
The comments will provide any details about usage:

byte[] tableData = someMethodThatGetsXMLData();
byte[] returnData = null;
int numRowsDeleted = 0;
try {
            VTDGen vtdGen = new VTDGen();
            vtdGen.setDoc(tableData);
            vtdGen.parse(false);
            VTDNav nav = vtdGen.getNav();
            // this modifier will actually make the deletes, and contain the modified XML data
            XMLModifier modifier = new XMLModifier();
            modifier.bind(nav);
            AutoPilot autoPilot = new AutoPilot();
            // use a query that will select all the nodes/elements you want to delete
            String xpathQuery = "//note-id[text()='1']";
            autoPilot.selectXPath(xpathQuery);
            autoPilot.bind(nav);
            int cnt;
            while((cnt=autoPilot.evalXPath()) != -1) {
                modifier.remove();
                numRowsDeleted++;
            }
            if (numRowsDeleted > 0) {
                // The XMLModifier will delete the nodes, but they will only be deleted in
                // the XML data stored in the XMLModifier.
                // extract the modified xml with the deleted nodes from the XMLModifier
                returnData = modifier.outputAndReparse().getXML().getBytes();
            }
            else {
                returnData = tableData;
        }
        catch (Exception ex) {
            _logger.logError("Error deleting elements: ", ex);
        }
// return the modified xml, if there was any
return returnData;

Fire back if you have any questions or comments.

AlG

---------- Original Message -----------
From: W K <wka...@ho...> 
To: "vtd...@li..." <vtd...@li...>, "jz...@xi..." <jz...@xi...> 
Sent: Wed, 28 May 2014 01:45:59 -0400 
Subject: Re: [Vtd-xml-users] XMLModifier remove all elements of type 'x'

> Corrected inconsistencies in snippets below from previous email...
> 
> I have the following xml snippet:
> 
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> <notes version="1.0">
>     <note-count>5</note-count>
>     <refs>
>         <b id="1">
>             <c id="1">
>                <v id="2">
>                    <note-id>1</note-id>
>                     <note-id>2</note-id>
>                     <note-id>5</note-id>
>                 </v>
>             </c>
>            <c id="4">
>                <v id="2">
>                    <note-id>1</note-id>
>                     <note-id>2</note-id>
>                     <note-id>3</note-id>
>                 </v>
>             </c>
>        </b>
>         <b id="22">
>             <c id="1">
>                <v id="2">
>                    <note-id>1</note-id>
>                     <note-id>4</note-id>
>                     <note-id>5</note-id>
>                 </v>
>             </c>
>        </b>
>     </refs>
> <notes>
> 
> I need to remove all elements: <note-id>1</note-id>
> 
> I have the following code snippet to remove all of the elements:
>             XM.bind(VN);
>             AutoPilot ap = new AutoPilot( VN );
>             
>             // find all note-id elements with a value of '1'
>             String xpath = "//note-id[text()='1']";
>             ap.selectXPath( xpath );
>            
>            int i = -1;
>             while ( ( i = ap.evalXPath() ) != -1 ) {
>                log.debug( "element/value: " + VN.toNormalizedString( VN.getCurrentIndex() ) + "/" + VN.toNormalizedString( VN.getText() ));
>                  XM.remove();  
>            }// while
> 
> If I just print out the xpath results, the element names and values are correct.  However, when trying to remove each value, I get the following error:
> 
> java.lang.ArrayIndexOutOfBoundsException: -1
>     at com.ximpleware.FastLongBuffer.longAt(FastLongBuffer.java:309)
>     at com.ximpleware.VTDNav.getTokenDepth(VTDNav.java:1327)
>     at com.ximpleware.VTDNav.getElementFragment(VTDNav.java:1079)
>     at com.ximpleware.XMLModifier.remove(XMLModifier.java:210)
>     at com.notes.android.util.NotesXmlUtil.deleteNoteIds(NotesXmlUtil.java:633)
>     at com.notes.android.test.NotesXmlUtilTest.deleteNoteById(NotesXmlUtilTest.java:146)
>     at com.notes.android.test.NotesXmlUtilTest.test(NotesXmlUtilTest.java:49)
> 
> What is the best practice for removing these elements in bulk?
> 
> Thanks for any help you can provide.
------- End of Original Message -------