Is it possible to have a ModelGroup as a child of ModelGroup?? 2003-08-19 - By Geoff Granum
I'm writing a bit of recursive code (which has most assuredly been written
by dozens before I), and I am wondering if there will ever be a case such
that a model group could ever be a direct child of a model group? I don't
believe that this would happen, but would like to be sure.
Essentially I need to be sure that when my function calls itself from the
model group block, it cannot go straight back into the model group block
again -- this would 'flatten' the tree, if it didn't crash outright. Here
is the code, just for kicks:
Alternativly, if there is some utility class that already does this that I
just haven't found, I'd love to hear about it :~)
This code, obviously, does not work yet. It DOES work for much of what I
need it for (normal elements). I don't implement wildcards becuase:
a.) I don't know quite how. Do you just ignore the children when
validating?
b.) I don't ever create XML schema with no-type empty elements; hence no
wildcards in my schema ( I think)
I have it working a different way currently, but am working on making it
easier to read and faster. Two things I'm not too great at :~)
Thanks!
/**
* Create a node from an XSObject. Returns <code>parent</code> after
attempting to append all nodes from
* <code>obj</code>. This will likely require recurrsive calls to this
function. Sets values to their
* defaults, if they are specified in the Schema.
* @(protected) obj The XSObject to append to <code>parent</code> as a Node
object.
* @(protected) parent The Node object to append to
* @(protected) <code>parent</code>, after appending <code>obj</code> and all
of its children.
*/
public Node getNode(XSObject obj, Node parent) {
short objType = obj.getType();
Node node = null;
if (objType == XSConstants.PARTICLE) {
obj = ( (XSParticleDecl) obj).getTerm(); // Either a
XSElementDeclaration, XSModelGroup, or an XSWildcard
objType = obj.getType();
}
if (objType == XSConstants.MODEL_GROUP) {
XSModelGroupImpl grp = (XSModelGroupImpl) obj;
XSObjectList lst = grp.getParticles();
XSParticle part = null;
for (int i = 0; i < lst.getLength(); i++) {
part = (XSParticleDecl) lst.item(i);
parent = getNode(part, parent); // This won't work if Model Groups can
have model groups for children!!!!!!!
}
return parent;
}
if (objType == XSConstants.ELEMENT_DECLARATION) {
if ( (node = getNode(obj)) != null) { // The other function, which I
need to get rid of. This function and that one rely on each other
parent.appendChild(node);
}
return parent;
}
if (objType == XSConstants.WILDCARD) {
System.out.println("wildcard");
/*@(protected) Implement wildcard
}
if (objType == XSConstants.TYPE_DEFINITION) {
System.out.println("type def");
XSTypeDefinition type = (XSTypeDefinition) obj;
if (type.getTypeCategory() == type.COMPLEX_TYPE) {
// handle COMPLEX_TYPE case
XSComplexTypeDecl cType = (XSComplexTypeDecl) type;
return getNode( (XSParticle) cType.getParticle(), parent);
}
else if (type.getTypeCategory() == type.SIMPLE_TYPE) {
XSSimpleTypeDecl sType = (XSSimpleTypeDecl) obj;
Node textNode = document.createTextNode("");
parent.appendChild(textNode);
return parent;
}
else {
System.out.println("Error with TYPE_DECLARATION in
getNode(XSObject)");
}
}
return parent;
}
--
Geoff Granum
granum@(protected)
Aeronautical & Astronautical Engineering,
Purdue University
West Lafayette, Indiana
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