[jdom-interest] getChild with Attribute

[Kenworthy, Edward]

Actually that wouldn't work. It wouldn't find any nested elements with the
attribute. You would need to use recursion to do that.

Here's a method I use (it uses the "name" attribute AND element type
(getName()) to work out whether it's a matching element.)


  private Collection internalGetAllInstances(Element searchRoot, Element
element, Collection listOfMatches)
  {
    listOfMatches.add(element);

// check if there are multiple instances of the element
    Attribute elementNameAtt = element.getAttribute(NAME_ATT);
    if (elementNameAtt != null)
    {
      String elementName = elementNameAtt.getValue();
      if (elementName.length() != 0)
      {
	List children = searchRoot.getChildren();
	if (children.size() > 0)
	{
	  Iterator iter = children.iterator();
	  while(iter.hasNext())
	  {
	    Element current = (Element)iter.next();
	    if (current.getName().equalsIgnoreCase(element.getName()))
	    {
	      Attribute nameAtt = current.getAttribute(NAME_ATT);
	      if (nameAtt != null)
	      {
		String name = nameAtt.getValue();
		if (name.length() != 0)
		{
		  if (name.equalsIgnoreCase(elementName))
		  {
		    logger.debug("Everything matches, add it to the list.");
		    listOfMatches.add(current);
		  }
		  else
		  {
		    logger.debug("Types match, but name doesn't, so check
its children.");
		    internalGetAllInstances(current, element,
listOfMatches);
		  }
		}
	      }
	    }
	    else
	    {
	      logger.debug("Types don't match, can't be the same, so check
its children.");
	      internalGetAllInstances(current, element, listOfMatches);
	    }
	  } // while
	}
      }
      else
      {
	logger.debug("No name attribute set, can't have other instances");
      }
    }
    else
    {
      logger.debug("No name attribute at all, can't have other instances");
    }
    return listOfMatches;
  }

-----Original Message-----
From: Dave Writz [mailto:dave.writz at cornerstone.net]
Sent: 03 April 2001 04:23
To: jdom-interest at jdom.org
Subject: [jdom-interest] getChild with Attribute


Is it possible to get a child of an element based on a attribute value
without using XPath?  I have been able to get it working with XPath, but am
hoping for a cleaner implementation.

What I am looking for is something like the following:

String  value   = document.getRootElement().root.getChild("ElementName", new
Attribute("name", "value")).getText();

This of course would return the first child element that matched the name
and contained the attribute.

Ideally this could be extended to support a multiple attribute list.


Thanks

-Dave


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