[Matamane]

I've recently learned about XMLPullParser, and I am interested in learning how to implement it.

Does anyone know of any source code or examples of the implementation I could look at?

[KYA]

Here might be a good place to start. Looks nearly identical to StaX, which I wrote about yesterday.

[Matamane]

It's the API I have been having trouble understanding, but your article was a huge help. What an odd coincidence, and quite fortunate. Thanks

So if I am understanding this correctly.

I initialize the XmlPullParserFactory as well as a Reader, and then I load an Xml file, and from there I can read from it.

This post has been edited by Matamane: 11 July 2010 - 06:40 PM

[KYA]

Yup, that's about it.

[Matamane]

KYA, on 11 July 2010 - 05:42 PM, said:

Yup, that's about it.

So part 2.

import java.io.IOException;
 import java.io.StringReader;

 import org.xmlpull.v1.XmlPullParser;
 import org.xmlpull.v1.XmlPullParserException.html;
 import org.xmlpull.v1.XmlPullParserFactory;

 public class SimpleXmlPullApp
 {

     public static void main (String args[])
         throws XmlPullParserException, IOException
     {
         XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
         factory.setNamespaceAware(true);
         XmlPullParser xpp = factory.newPullParser();

         xpp.setInput( new StringReader ( "<foo>Hello World!</foo>" ) );
         int eventType = xpp.getEventType();
         while (eventType != XmlPullParser.END_DOCUMENT) {
          if(eventType == XmlPullParser.START_DOCUMENT) {
              System.out.println("Start document");
          } else if(eventType == XmlPullParser.END_DOCUMENT) {
              System.out.println("End document");
          } else if(eventType == XmlPullParser.START_TAG) {
              System.out.println("Start tag "+xpp.getName());
          } else if(eventType == XmlPullParser.END_TAG) {
              System.out.println("End tag "+xpp.getName());
          } else if(eventType == XmlPullParser.TEXT) {
              System.out.println("Text "+xpp.getText());
          }
          eventType = xpp.next();
         }
     }
 }

I'm getting the following error

/META-INF/services/org.xmlpull.v1.XmlPullParserFactory make sure that parser implementing XmlPull API is available

How do I fix this.

c

[KYA]

Do you have the appropriate JARs/libraries added to your project?

[Matamane]

The folders are in the same project.

Do I have to add the JAR to my libraries instead?

[KYA]

I'm almost 100% positive that's what you need to do (I haven't tested it myself otherwise I could tell you for sure).

[Matamane]

I got it working, now I am trying to load from a uri. What reader would you suggest?

[KYA]

XMLStreamReader...should be compatible with this pull API?

[Matamane]

KYA, on 12 July 2010 - 06:21 AM, said:

XMLStreamReader...should be compatible with this pull API?

Not exactly, which is why I was asking. But I thought up an odd bit of necromancy which would allow it too. I am testing it now

[KYA]

Doesn't look like you need a "reader" (like the ones in the standard API). XMLPull's "reader" is called "XMLPullParser". See here.

[Matamane]

setInput takes either a Reader, or both an InputStream and String.

I tried to initialize an XMLReader using a sub factory of XMLInputFactory.

That failed.

using a URL.openStream and a null string worked fine.

[KYA]

I misunderstood the question. There's no reason to use an XMLStreamReader here.

What you pass in depends on your source (like the URL) you mentioned or a file on your local drive, etc...