private FSArray addTreebankNodeChildrenToIndexes(
TreebankNode parent, JCas jCas, List<CoreLabel> tokenAnns, Tree tree) {
Tree[] childTrees = tree.children();
// collect all children (except leaves, which are just the words - POS tags are pre-terminals in
// a Stanford tree)
List<TreebankNode> childNodes = new ArrayList<TreebankNode>();
for (Tree child : childTrees) {
if (!child.isLeaf()) {
// set node attributes and add children (mutual recursion)
TreebankNode node = new TreebankNode(jCas);
node.setParent(parent);
this.addTreebankNodeToIndexes(node, jCas, child, tokenAnns);
childNodes.add(node);
}
}
// convert the child list into an FSArray
FSArray childNodeArray = new FSArray(jCas, childNodes.size());
for (int i = 0; i < childNodes.size(); ++i) {
childNodeArray.set(i, childNodes.get(i));
}
return childNodeArray;
}
private void addTreebankNodeToIndexes(
TreebankNode node, JCas jCas, Tree tree, List<CoreLabel> tokenAnns) {
// figure out begin and end character offsets
CoreMap label = (CoreMap) tree.label();
CoreMap beginToken = tokenAnns.get(label.get(BeginIndexAnnotation.class));
CoreMap endToken = tokenAnns.get(label.get(EndIndexAnnotation.class) - 1);
int nodeBegin = beginToken.get(CharacterOffsetBeginAnnotation.class);
int nodeEnd = endToken.get(CharacterOffsetEndAnnotation.class);
// set span, node type, children (mutual recursion), and add it to the JCas
node.setBegin(nodeBegin);
node.setEnd(nodeEnd);
node.setNodeType(tree.value());
node.setChildren(this.addTreebankNodeChildrenToIndexes(node, jCas, tokenAnns, tree));
node.setLeaf(node.getChildren().size() == 0);
node.addToIndexes();
}