Re: [digester] how to parse node trees

Josï¿½ Antonio Pï¿½rez Testa Thu, 29 Apr 2004 10:54:39 -0700

Hi Juergen, apart from corrections donwside, you have to push an object to the Digester stack in order to have something to return when the parsing of the xml ends. That is because the SetNext rule pops the element from the stack, so if you start up with nothing you end up with nothing.

Simon surely could give a better explanation but i think that is the basic idea!

Juergen Weber wrote:

Hi,

I want to parse an xml for this dtd


<!ELEMENT node (node*) >
<!ELEMENT node (#PCDATA) >
<!ATTLIST node type CDATA "name">

like

<?xml version="1.0" encoding="iso-8859-1"?>

<!DOCTYPE node SYSTEM "tree.dtd">
<node name="Impulsdefinitionen">
        <node name="a">
                <node name="b">
                        <node name="c">
                                <node name="d">
                                </node>
                        </node>
                        <node name="e">
                        </node>
                </node>
        </node>
</node>

I tried

Digester digester = new Digester(); digester.setValidating(false);

//digester.addObjectCreate("node",Node.class);
digester.addObjectCreate("*/node",Node.class);
digester.|addSetProperties(|"*/node",|"name"||, "name");|

digester.addSetNext("*/node", "addNode");

InputSource inputSource = new InputSource(xmlfile);

inputSource.setSystemId(dtdfile.toString());

return digester.parse(inputSource);

but this failed with

29.04.2004 19:22:09
org.apache.commons.digester.Digester peek
WARNUNG: Empty stack (returning null)
29.04.2004 19:22:09
org.apache.commons.digester.Digester endElement
SCHWERWIEGEND: End event threw exception
java.lang.NullPointerException
        at
org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:245)
        
        
        
What did I forget?

Node is

public class Node
{
        List l = new ArrayList();
        String name;
        
        public void addNode(Node node)
        {
                l.add(node);
        }
        
        public Iterator getNodes()
        {
                return l.iterator();
        }
        
        public String getName()
        {
                return name;
        }
        
   public void setName(String name)
        {
                this.name = name;
        }
}

Thanks, Juergen

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Re: [digester] how to parse node trees

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