removing element from document

[John Cartwright]

Hello All,

I need to remove all the Elements from a Document who have a particular
attribute w/ a particular value.  My first (unsuccessful) attempt was
Element#removeContent w/in an iterator loop which throws a
ConcurrentModificationException.

Can someone suggest to me the correct way to do this sort of thing?

Thanks!

-- john

         
          List features =
root.getChild("RESPONSE").getChild("FEATURES").getChildren("FEATURE");
          for (Iterator i=features.iterator();i.hasNext();) {
              feature = (Element) i.next();
              fields = feature.getChild("FIELDS").getChildren("FIELD");
              for (Iterator j=fields.iterator(); j.hasNext();) {
                  field = (Element)j.next();
                  if ("#SHAPE#".equals(field.getAttributeValue("name"))) {
                      //throws ConcurrentModificationException
                      feature.getChild("FIELDS").removeContent(field);
                  }
              }            
          }

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[John Cartwright]

Sorry to reply to myself,  but the following XPath approach seems to
work - is the the recommended solution?

-- john

List nodesToDelete = XPath.selectNodes(root, "//FIELD[@name='#SHAPE#']");
int size = nodesToDelete.size();
for (int i=0; i<size; i++){
   ((Element)nodesToDelete.get(i)).detach();
}



John Cartwright wrote:

> Hello All,
>
> I need to remove all the Elements from a Document who have a
> particular attribute w/ a particular value.  My first (unsuccessful)
> attempt was Element#removeContent w/in an iterator loop which throws a
> ConcurrentModificationException.
>
> Can someone suggest to me the correct way to do this sort of thing?
>
> Thanks!
>
> -- john
>
>                  List features =
> root.getChild("RESPONSE").getChild("FEATURES").getChildren("FEATURE");
>          for (Iterator i=features.iterator();i.hasNext();) {
>              feature = (Element) i.next();
>              fields = feature.getChild("FIELDS").getChildren("FIELD");
>              for (Iterator j=fields.iterator(); j.hasNext();) {
>                  field = (Element)j.next();
>                  if ("#SHAPE#".equals(field.getAttributeValue("name"))) {
>                      //throws ConcurrentModificationException
>                      feature.getChild("FIELDS").removeContent(field);
>                  }
>              }                     }
>
> _______________________________________________
> To control your jdom-interest membership:
> http://www.jdom.org/mailman/options/jdom-interest/youraddr@...

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[rolf.lear]

Just change the inside of the loop from:

                      //throws ConcurrentModificationException
                      feature.getChild("FIELDS").removeContent(field);

to:

                      //throws ConcurrentModificationException
                      j.remove();

It is 'well-documented' that if you have an integrator, you can't change
the collection apon which the iterator is based, unless you use the
iterator to make the change. See the ConcurrentModificationException
javadoc.

Rolf

-----Original Message-----
From: jdom-interest-bounces@...
[mailto:jdom-interest-bounces@...] On Behalf Of John Cartwright
Sent: Thursday, December 06, 2007 2:10 PM
To: jdom-interest@...
Subject: [jdom-interest] removing element from document

Hello All,

I need to remove all the Elements from a Document who have a particular
attribute w/ a particular value.  My first (unsuccessful) attempt was
Element#removeContent w/in an iterator loop which throws a
ConcurrentModificationException.

Can someone suggest to me the correct way to do this sort of thing?

Thanks!

-- john

         
          List features =
root.getChild("RESPONSE").getChild("FEATURES").getChildren("FEATURE");
          for (Iterator i=features.iterator();i.hasNext();) {
              feature = (Element) i.next();
              fields = feature.getChild("FIELDS").getChildren("FIELD");
              for (Iterator j=fields.iterator(); j.hasNext();) {
                  field = (Element)j.next();
                  if ("#SHAPE#".equals(field.getAttributeValue("name")))
{
                      //throws ConcurrentModificationException
                      feature.getChild("FIELDS").removeContent(field);
                  }
              }            
          }

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[Rob Davis-5]

Whatever works for you my friend. I use the XPath approach myself.

Another way would be to use XSLT - if you can understand it.

Manipulating XML is like a London tube map; there are many valid ways to get to the same destination.

Some useful links:
http://www.edankert.com/defaultnamespaces.html
http://www.zvon.org/xxl/XPathTutorial/General/examples.html

John Cartwright wrote:

Sorry to reply to myself,  but the following XPath approach seems to
work - is the the recommended solution?

-- john

List nodesToDelete = XPath.selectNodes(root, "//FIELD[@name='#SHAPE#']");
int size = nodesToDelete.size();
for (int i=0; i<size; i++){
   ((Element)nodesToDelete.get(i)).detach();
}



John Cartwright wrote:
> Hello All,
>
> I need to remove all the Elements from a Document who have a
> particular attribute w/ a particular value.  My first (unsuccessful)
> attempt was Element#removeContent w/in an iterator loop which throws a
> ConcurrentModificationException.
>
> Can someone suggest to me the correct way to do this sort of thing?
>
> Thanks!
>
> -- john
>
>                  List features =
> root.getChild("RESPONSE").getChild("FEATURES").getChildren("FEATURE");
>          for (Iterator i=features.iterator();i.hasNext();) {
>              feature = (Element) i.next();
>              fields = feature.getChild("FIELDS").getChildren("FIELD");
>              for (Iterator j=fields.iterator(); j.hasNext();) {
>                  field = (Element)j.next();
>                  if ("#SHAPE#".equals(field.getAttributeValue("name"))) {
>                      //throws ConcurrentModificationException
>                      feature.getChild("FIELDS").removeContent(field);
>                  }
>              }                     }
>
> _______________________________________________
> To control your jdom-interest membership:
> http://www.jdom.org/mailman/options/jdom-interest/[e-mail]
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