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Subject: XOM API for Processing XML with Java

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RE: [XOM-interest] Needs hasX(String)

From: Elliotte Rusty Harold <elharo AT metalab.unc.edu>
To: "Regier Avery J" <RegierAveryJ AT JohnDeere.com>, "'xom-interest AT lists.ibiblio.org'" <xom-interest AT lists.ibiblio.org>
Subject: RE: [XOM-interest] Needs hasX(String)
Date: Thu, 10 Apr 2003 11:24:11 -0400

At 9:52 AM -0500 4/10/03, Regier Avery J wrote:

I hope I've explained this need at the beginning of this message. It is a
matter of integration ease.

No, I'm afraid you haven't. If you want this you're going to need to show me concrete use cases in actual code, not theoretical arguments. e.g. "to write an Ant task that uses XOM I need to use Iterators" and then you need to show me either a lot more cases like this, or conclusively demonstrate that your own adapter can't really work. Remember, XOM is an 80/20 API so it's not enough that something be useful. It's got to be useful for 80%. I don't think having to drag xom.jar around to compile is a real problem for 80% of the uses.

public class NodeIterator implements Iterator {
private Node node;
private int pos = 0;

public NodeIterator(Node node) {
this.node = node;
}
public boolean hasNext() {
return pos < size();
}

public Object next() {
return mutate(nextNode());
}

protected Object mutate(Node node) {
return node;
}

/**
* Type specific next() method
*/
public Node nextNode() {
return node.get(pos++);
}

public int size() {
return node.getChildCount();
}

public void remove() {
removeChild(pos);
}
}

This is just more variations. All the old problems are still there. You've just added methods that don't have those problems. I want those problems gone completely. If only Java had covariant return types...

It really does sound to me like what you want is JDOM rather than XOM. There are other choices in this space. I much prefer to have multiple APIs with clean visions rather than single APIs that try to satisfy everyone. JDOM's vision includes the collections API. XOM's doesn't. FYI, it was in large part my experience with the Collections API in JDOM that convinced me it was in appropriate for XOM. Iterators, Lists, and so forth just caused way too much pain in writing code on top of JDOM with no benefits I could perceive.
--

+-----------------------+------------------------+-------------------+
| Elliotte Rusty Harold | elharo AT metalab.unc.edu | Writer/Programmer |
+-----------------------+------------------------+-------------------+
| Processing XML with Java (Addison-Wesley, 2002) |
| http://www.cafeconleche.org/books/xmljava |
| http://www.amazon.com/exec/obidos/ISBN%3D0201771861/cafeaulaitA |
+----------------------------------+---------------------------------+
| Read Cafe au Lait for Java News: http://www.cafeaulait.org/ |
| Read Cafe con Leche for XML News: http://www.cafeconleche.org/ |
+----------------------------------+---------------------------------+

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From todd.trimmer AT trizetto.com Thu Apr 10 13:34:08 2003

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Subject: [XOM-interest] Sugar syntax
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If most of the methods of the Node and its ancestors are final, then why
does sugar syntax hurt so much? It doesn't make a subclasser's job easier or
harder.

Todd Trimmer

RE: [XOM-interest] Needs hasX(String), Elliotte Rusty Harold, 04/10/2003