RE: [Digester] Parsing XML to a hashtable

[Savitsky, Alex]

I think I wasn't very clear about my problem - the Contact bean itself has a
hashmap, and "RowId" and "LastName" act as fields there. Here's the full
source just to eliminate all confusion:

public class Contact {

        // Actual bean contains 30+ fields,
        // omitted for simplicity sake
        private Map fields = new HashMap();

        // Field name constants to use with get()
        public static final String ROW_ID = "RowId";
        public static final String LAST_NAME = "LastName";

        public String get(String name) {
                return (String) fields.get(name);
        }

        public void set(String name, String value) {
                fields.put(name, value);
        }

        public void populate(String xml) throws Exception {

                Digester d = new Digester();

                // *********************************
                // Now what to put there for rules??
                // *********************************

                digester.push(this);

                digester.parse(new StringReader(xml));

        }

        public static void main(String[] args) throws Exception {

                String xml = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" +
                        "<Contact>" +
                        "<RowId>1</RowId>" +
                        "<LastName>1</LastName>" +
                        "</Contact>";

                Contact c = new Contact();

                c.populate(xml);

                // What I want to get is two entries in "fields" hashmap,
                // ("RowId", "1") and
                // ("LastName", "Smith")
        }

}

Now, the SetProperty rule doesn't work there, because it operates on tag
attributes, not on the tag itself - again, unless I'm missing some obscure
parameter combination that make it work in a different way...

Tried CallMethod rule, too, and CallParam seem to be unable to pick up the
tag name (e.g., "RowId") as a parameter value

Any other ideas?

Thanks,

Alex

-----Original Message-----
From: Martin Kersten [mailto:[EMAIL PROTECTED]
Sent: Tuesday, March 02, 2004 9:19 AM
To: Jakarta Commons Users List
Subject: Re: [Digester] Parsing XML to a hashtable


Hi,

> I have a HashMap-based java bean that I'm trying to populate from an XML
> file. Now, the only accessors java bean exposes are get(String) and
> set(String, String), and XML file contains its data in body text, like
that:
>
> <Contact>
> <RowId>1</RowId>
> <LastName>Smith</LastName>
> </Contact>
>
> Now, while the whole setup looks fairly common, it doesn't look like
there's
> an easy way to parse it... I tried the CallMethod rule, but apparently it
> can accept parameters from pretty much anywhere - from body text, tag
> attribute, even the tag node up the stack - except from the tag name
itself!
> Am I missing something there?
>
> Thanks in advance,
Check the addSetProperty method. Should help you, I guess. If not
compose the contact using a bean and add it to your map represented
by the next xml level tag (like <contacts>) using addSetNext(..).

Example:

   addCreateObject("*/contact", Contact.class);
   ... (initialize the contact rowId and lastName properties using
addSetProperties)
   addSetNext("*/contact","addContact");

   + top level (or next higher level).
   addCreateObject("contacts", ContactMap.class);

//add method
contacts.addContact(Contact contact) {
    if(contact.isValid())
       contactMap.set(contact.getRowId(), contact.getLastName());
}

I think you can guess the meaning of it.

Summary: Try addSetProperty rule first. If it is not working try the
second approach.


Bye,

Martin (Kersten)



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