public PdfObjectTreeNode getAncestor() {
if (isRecursive()) {
PdfObjectTreeNode node = this;
while (true) {
node = (PdfObjectTreeNode) node.getParent();
if (node.isIndirectReference() && node.getNumber() == getNumber()) {
return node;
}
}
}
return null;
}
@SuppressWarnings("unchecked")
public PdfObjectTreeNode getChildNode(PdfObjectTreeNode node, PdfName key) {
Enumeration<PdfObjectTreeNode> children = node.breadthFirstEnumeration();
PdfObjectTreeNode child;
while (children.hasMoreElements()) {
child = children.nextElement();
if (child.isDictionaryNode(key)) {
if (child.isIndirectReference()) {
expandNode(child);
child = (PdfObjectTreeNode) child.getFirstChild();
}
expandNode(child);
return child;
}
}
return null;
}