I need help using a SAX parser

Question

Hello,
I have a class that goes out to the web and retrieves an xml document w/o ever writing it to disk. I like to parse that object using SAX and a class that extends HandlerBase. Can any one show me how to parse an xml document that lives in memory rather than in a file? I've found many examples, but all of them assume you are reading from a file system. Any help is greatly appreciated.
Here is the jist of my code :
// Class 1 makes a request to another server based on some variable data. I've created a messenger object that handles all of the communications and returns the data in a DataInputStream
XMLMessage xml = new XMLMessage();
xml.createRequest(args[0],args[1],args[2]);
XMLMessenger messenger = new XMLMessenger(xml.getDoc());
DataInputStream dis = messenger.transferDocument();
ResponseObj resp = new ResponseObj();
resp.read(dis);
System.out.println(resp.getvalue1() + "*" + resp.getvalue2()+ "*");
// Class 2 is the ResponseObj and I want to use something similar to this read method, but
// I can't get it to work with a data stream, instead of a string that represents a file.
public void read(String filename) throws java.lang.Exception {
Class c = Class.forName("com.ibm.xml.parser.SAXDriver");
     org.xml.sax.Parser parser = (org.xml.sax.Parser)c.newInstance();
     parser.setDocumentHandler(this);
     parser.parse(filename);

Answer 1

Thanks for you help. I've modified my read() method to work like this :
org.xml.sax.Parser parser = new com.ibm.xml.parser.SAXDriver();
parser.setDocumentHandler(this);
InputSource is = new InputSource(dis);
parser.parse(is);
This makes sense, but I'm still not getting any thing returned from the startElement(),characters(), or endElement() methods. It reports no errors, it just doesn't happen. Do you have any suggestions on how to debug this? I'm stumped, but really need to get this working.