[From nobody Mon Sep 20 17:38:33 2004
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Message-ID: <414F7727.9D415FAC@mitre.org>
Date: Mon, 20 Sep 2004 20:34:47 -0400
From: Mike Brenner <mikeb@mitre.org>
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To: Per Norrman <per.norrman@austers.se>
Subject: Re: Fwd: Re: [jdom-interest] XML Signature
References: <414B11D3.4080104@xquery.com> <414B6FE2.408@austers.se>
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This does not work like, say, getElementById in an
xml svg file, which searches all levels. This code
only searches one level.


 
> > I would much rather write
> >
> > doc.getRootElement().getChild("partslist").getElementById("12345")
> >
> > than
> >
> > list = getRootElement().getChild("partsist").getChildren();
> > for (int i = 0; i < list.size(); i++) {
> >        Element e = list.get(i);
> >        if e.getAttributeValue("id").equals(id)  etc.
> >

Per Norrman wrote:
> No, no, no. Document.getElementById(String id) would return the Element
> that has an attribute whith type ID_ATTRIBUTE and which value is equal to
> the id parameter. The name of the attribute is irrelevant.
> 
> It should behave exactly as org.w3c.dom.Document#getElementById(String id)
> 
> It is very easy to implement:
> 
> Element getElementById(String value) {
>     for(Iterator i = getDescendants(); i.hasNext(); ) {
>        Object node = i.next();
>        if (node instanceof Element) {
>           Element e = (Element) node;
>           for(Iterator j = e.getAttributes().iterator(); j.hasNext();) {
>              Attribute a = (Attribute) j.next();
>              if (a.getAttributeType() == Attribute.ID_TYPE &&
>                  value.equals(a.getValue())
>              {
>                 return e;
>              }
>           }
>        }
>     }
>     return null;
> }
> 
> Probably performs like dog for large documents, but then you could enhance it
> with Laurent's mapping solution.
]