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- From: "Stockett, Jeff" <stockett@quadralay.com>
- To: "'xml-dev@ic.ac.uk'" <xml-dev@ic.ac.uk>
- Date: Sun, 2 May 1999 15:24:30 -0500
Hello. I'm relatively new to Java, so please forgive if this is a simple
question. I'm using SAX to render a treeview table of contens from
XML where the source content looks something like:
<?xml version='1.0' encoding='ISO-8859-1' ?>
<toc version="1.0">
<tocitem target="booktoca_htm_641017" text="Introduction">
<tocitem target="booktoca_htm_641019" text="What is Transmitter
Reporter?"/>
<tocitem target="booktoca_htm_641021" text="Finding the Report You
Need"/>
<tocitem target="booktoca_htm_641023" text="Using Help"/>
</tocitem>
</toc>
To handle tracking what level in the tree I'm at, I thought I'd use a stack
so my
handler is as follows:
public class TOCHandler extends HandlerBase
{
private java.util.Stack stack;
public void startElement(String name, AttributeList atts)
{
System.out.println("Start element: " + name);
if (name.equals("tocitem"))
{
String text = atts.getValue("text");
if (stack.empty())
{
symantec.itools.awt.TreeNode child = new
symantec.itools.awt.TreeNode(text, Contents);
Contents.append(child);
stack.push(child);
}
else
{
symantec.itools.awt.TreeNode child = new
symantec.itools.awt.TreeNode(text, Contents);
symantec.itools.awt.TreeNode parent =
(symantec.itools.awt.TreeNode) stack.peek();
stack.push(child);
Contents.addChild(child, parent);
}
}
}
public void endElement(String name)
{
System.out.println("End element: " + name);
if (name.equals("toc"))
Contents.redraw();
if (name.equals("tocitem"))
stack.pop();
}
}
Now I get a SAXException of type null when the first check to stack.empty()
happens?
What gives? This was all working fine before I added the stack, but I fail
to see what
I'm doing wrong. Does it have something to do with the fact that the stack
methods
are declared synchronized?
Best Regards,
Jeff Stockett
Quadralay Corporation
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