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Re: Comments from implementing java dom classes

From: Laurent ROUVET <rouvet@cnam.fr>
Date: Mon, 29 Dec 1997 10:17:08 +0100
Message-ID: <34A76A94.70F5D3CF@cnam.fr>
To: www-dom@w3.org, Alexandre Rafalovitch <arafalov@socs.uts.EDU.AU>
> Date: Fri, 17 Oct 1997 21:44:03 +1000 (EST)
> From: Alexandre Rafalovitch <arafalov@socs.uts.EDU.AU>
> To: www-dom@w3.org
> Message-ID: <Pine.SOL.3.95.971017211733.6388C-100000@charlie>
> Subject: Comments from implementing java dom classes.
> NoSuchNodeException extends Exception. The alternative is for it to
> extends RuntimeException. In the current case it has to be cought by
> everybody calling methods even if they know there would be no problem. (as
> Also, currently in java binding there is only default constructor and 
> no constructor that takes a string. It would be nice to have one, to
> provide some feedback on why exception was thrown and not only where.
> in item(0) when items is not null. In the second case, it can propogate
> without declaration in the same way IndexOutOfBoundaries exception
> propogates for array access. (you don't want to put try and catch on every
> a[i]=j... :-}

I completely agree. I propose :

package w3c.dom;
public class NoSuchNodeException extends IndexOutOfBoundsException {
	public NoSuchNodeException() {
	public NoSuchNodeException(int index) {
		super("NodeList index out of range: " + index);
	public NoSuchNodeException(String s) {

It may be better to rename NodeListIndexOutOfBoundsException.

> In NodeList: 
>    prepend description refers to insertChild - should be insert.
>    replace() method is declared as returning void, should be Node.
>    Description for replace has following text:
>      (null is returned if the index is equal to the previous number
>          of nodes in the list).
>    What is this _previous_ number of nodes refer to? 

Could a person give an answer... Thanks.

> Questions on logic:
> In Node:
>   getPreviousSibling, getNextSibling are traversing in breadth first 
>   order. Does it mean the getNextSibling on the last element _in a 
>   level_ would go to the first child of the first element of that 
>   level? That is the way I understood breadth-first traversal. 
>   I would have imagined that it would stop once it reaches last element
>   of the level it is currently on. (level defined by a common parent).
>   For example:
>   x1
>   |-x2.1
>   | |-x3.1
>   |
>   |-x2.2
>   |
>   |-x2.3
>   Would getNextSibling on x2.3 go to x3.1? It would for proper 

Yes. I assume.

>   getElementsByTagName is depth first. Is it prefix, postfix, infix or
>   leaves only order? 

It is prefix. I assume.

> In general, it seems that having setters for some of the attributes
> does not make sense (they are derived) and they should be read only.
> For example: setSpecified on Attribute does not make sense as it is
>  an indication of whether value was supplied with setValue() or not.
>  Same with setCharacter for NumericCharacterReference and several
>  others.

For example: 

FRAMESET cols or rows = multi-length-list [CN]
			and the default value is 100%...
So, if cols attribute of FRAMESET isn't indicate you'll set specified =


Laurent ROUVET.
Received on Monday, 29 December 1997 17:28:35 UTC

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