Dear Group and Xerces-Gods,
maybe a simple question for you but a big problem for me. Haven't found
a hint within doc, faq and group (or maybe i'm to dumb to understand
it).
The situation:
--------------
I have to "cleanup" a DOMTree after processing it. I load a "template"
XML File, parse it, change/add/delete some nodes/values/attributes as
neccesary and save it again under another filename. After manipulating
the XML-Document in memory maybe in a ugly state (not in the meaning of
correctness. It is still wellformed of course). But some nodes are empty
after processing (has had a value before processing). Some attributes
may be obsolete now, i don't want comment-nodes in the resulting xml
file (against i want them for documentation in the template of course)
a.s.o.
So after all processing i do a (let me call it a) "cleanup". I create a
DOMNodeIterator for the whole doctree. FastForward (with nextNode) to
the last node and traverse the iterator backwards (with previousNode)
researching each node and do what have to be done with it.
Now my question:
----------------
As stated above in some cases i need to remove the actual node (and the
whole subtree under it). This works fine, but then i'm in doubt about
the position of the DOMNodeIterator as i think it is LIVE, isn't it?
Which node i'll get if i call nextNode/previousNode after deleting the
actual Node?
Please find my related code below for your information what i do yet.
What must i do to set my nd-variable (see my code) to the correct
previous node of the now deleted actual node? I found no method to get
the actual node from the DOMNodeIterator without moving the
actualpointer of the iterator one forward or backward. Or I'm missing
here sth.? Is the best/only way to be sure that i have the right node to
do a nextNode/previousNode call to get the now actual node without
overjumping a node which then will not being processed/cleanup-ed?
I'm always thankful for suggestions to improve my surely inefficient and
hopefully not to buggy code (who laughs there? *GRUMBLE*) :-)). Please
if you see sth. could done better or safer feel free to let me know. I
like to learn and understand.
Thanks in advance for your help and cooperation.
CU all
Joerg
//--------------------------------------
// START OF CODE SNIPPET
//--------------------------------------
void dom_TreeCleanup(DOMDocument *doc)
{
DOMNodeIterator *dni;
DOMNode *nd, *tmpnd;
DOMNamedNodeMap *attrs;
DOMAttr *atnd;
int type;
// create Iterator
dni = doc->createNodeIterator(doc->getDocumentElement(),
DOMNodeFilter::SHOW_ALL, NULL, TRUE);
// Fast forward to get the last node as the actual node
while((tmpnd = dni->nextNode()) != NULL)
nd = tmpnd;
// Process the IteratorNodes backwards
while(nd != NULL)
{
// Get the nodetype to decide what to do (different nodes are
handled differently)
type = nd->getNodeType();
if(type == DOM_COMMENT_NODE)
{
// Don't need commentnodes anymore
dom_RemoveNode(nd);
}
else if(type == DOM_ELEMENT_NODE)
{
// Aaaah! an Element Node. This needs attribute related
processing
// so get the attributes for further investigation
attrs = nd->getAttributes();
// if there are attributes -> research them
if(attrs != NULL)
{
atnd = (DOMAttr *) attrs->getNamedItem(X(DOM_DEL_TAG));
if(atnd != NULL)
{
if(strcmp(X2C(atnd->getValue()), "1") == 0)
{
// If the delflag attribute value is 1 remove
that node
dom_RemoveNode(nd);
}
else
{
// If the delflag value is zero leave the node
alone but
// remove the delflag attributenode
dom_RemoveAttr(atnd);
}
}
}
// General Cleanup that belongs to every type of node
// If the actual node now (after nodetype-specific
processing) don't have any
// attributes AND no childnodes it is useless -> remove it
if(!(nd->hasAttributes()) && !(nd->hasChildNodes()))
{
dom_RemoveNode(nd);
}
}
// get the previous node as the new actual node
nd = dni->previousNode();
}
}
void dom_RemoveNode(DOMNode *nd)
{
nd->getParentNode()->removeChild(nd);
nd->release();
}
void dom_RemoveAttr(DOMAttr *attr)
{
attr->getOwnerElement()->removeAttributeNode(attr);
}
//--------------------------------------
// END OF CODE SNIPPET
//--------------------------------------
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