DOM_Node NodeIteratorImpl::previousNode (DOM_Node node) {
if (fDetached)
throw DOM_DOMException(DOM_DOMException::INVALID_STATE_ERR, null);
DOM_Node result;
// if we're at the root, return null.
if (node == fRoot)
return result;
// get sibling
result = node.getPreviousSibling();
if (result.isNull()) {
//if 1st sibling, return parent
result = node.getParentNode();
return result;
}
// if sibling has children, keep getting last child of child.
if (result.hasChildNodes()) {
while (result.hasChildNodes()) {
result = result.getLastChild();
}
}
return result;
}
DOM_Node TreeWalkerImpl::getFirstChild (DOM_Node node) {
DOM_Node result;
if (node.isNull()) return result;
DOM_Node newNode = node.getFirstChild();
if (newNode.isNull()) return result;
short accept = acceptNode(newNode);
if (accept == DOM_NodeFilter::FILTER_ACCEPT)
return newNode;
else
if (accept == DOM_NodeFilter::FILTER_SKIP
&& newNode.hasChildNodes())
{
return getFirstChild(newNode);
}
return getNextSibling(newNode);
}
DOM_Node NodeIteratorImpl::nextNode (DOM_Node node, bool visitChildren) {
if (fDetached)
throw DOM_DOMException(DOM_DOMException::INVALID_STATE_ERR, null);
if (node.isNull()) return fRoot;
DOM_Node result;
// only check children if we visit children.
if (visitChildren) {
//if hasChildren, return 1st child.
if (node.hasChildNodes()) {
result = node.getFirstChild();
return result;
}
}
// if hasSibling, return sibling
if (node != fRoot) {
result = node.getNextSibling();
if (! result.isNull()) return result;
// return parent's 1st sibling.
DOM_Node parent = node.getParentNode();
while (!parent.isNull() && parent != fRoot) {
result = parent.getNextSibling();
if (!result.isNull()) {
return result;
} else {
parent = parent.getParentNode();
}
} // while (parent != null && parent != fRoot) {
}
// end of list, return null
DOM_Node aNull;
return aNull;
}