How do you traverse and store XML in Blackberry Java app?
- by Greg
I'm having a problem accessing the contents of an XML document.
My goal is this:
Take an XML source and parse it into a fair equivalent of an associative array, then store it as a persistable object.
the xml is pretty simple:
<root>
<element>
<category_id>1</category_id>
<name>Cars</name>
</element>
<element>
<category_id>2</category_id>
<name>Boats</name>
</element>
</root>
Basic java class below. I'm pretty much just calling save(xml) after http response above. Yes, the xml is properly formatted.
import java.io.IOException;
import java.util.Hashtable;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import java.util.Vector;
import net.rim.device.api.system.PersistentObject;
import net.rim.device.api.system.PersistentStore;
import net.rim.device.api.xml.parsers.DocumentBuilder;
import net.rim.device.api.xml.parsers.DocumentBuilderFactory;
public class database{
private static PersistentObject storeVenue;
static final long key = 0x2ba5f8081f7ef332L;
public Hashtable hashtable;
public Vector venue_list;
String _node,_element;
public database()
{
storeVenue = PersistentStore.getPersistentObject(key);
}
public void save(Document xml)
{
venue_list = new Vector();
storeVenue.setContents(venue_list);
Hashtable categories = new Hashtable();
try{
DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory. newInstance();
DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
docBuilder.isValidating();
xml.getDocumentElement ().normalize ();
NodeList list=xml.getElementsByTagName("*");
_node=new String();
_element = new String();
for (int i=0;i<list.getLength();i++){
Node value=list.item(i).getChildNodes().item(0);
_node=list.item(i).getNodeName();
_element=value.getNodeValue();
categories.put(_element, _node);
}
}
catch (Exception e){
System.out.println(e.toString());
}
venue_list.addElement(categories);
storeVenue.commit();
}
The code above is the work in progress, and is most likely heavily flawed. However, I have been at this for days now. I can never seem to get all child nodes, or the name / value pair.
When I print out the vector as a string, I usually end up with results like this:
[{ = root, = element}]
and that's it. No "category_id", no "name"
Ideally, I would end up with something like
[{1 = cars, 2 = boats}]
Any help is appreciated.
Thanks
