Acquiring Stanford Dependencies representation from annotated document (Java) - stanford-nlp

Question

I am trying to retrieve the Stanford Dependencies representation of a sentence. Something like this:
nsubj(makes-8, Bell-1)
nsubj(distributes-10, Bell-1)
vmod(Bell-1, based-3)
I am using a coreNLP pipeline with the ddeparse annotator. The following code produces output in a similar, but not as friendly format.
private void printDepParse(Annotation document) {
List<CoreMap> sentences = document.get(SentencesAnnotation.class);
IoUtils.prln("---Dependencies---");
for(CoreMap sentence: sentences) {
// this is the Stanford dependency graph of the current sentence
SemanticGraph dependencies = sentence.get(BasicDependenciesAnnotation.class);
IoUtils.prln(dependencies.toString());
}
IoUtils.prln("---End Dependencies---");
}
Produces something like:
-> fed/VBD (root)
-> Jimmy/NNP (nsubj)
-> dog/NN (xcomp)
-> Billy/NNP (nsubj)
-> the/DT (det)
-> ./. (punct)
Is there a simple way of producing the former, more generally accepted format?

Answer 1

To get the Stanford Dependencies representation you need to use the GrammaticalStructures class. This should work:
for (CoreMap sentence: sentences) {
Tree tree = sentence.get(TreeAnnotation.class);
TreebankLanguagePack tlp = new PennTreebankLanguagePack();
GrammaticalStructureFactory gsf = tlp.grammaticalStructureFactory();
GrammaticalStructure gs = gsf.newGrammaticalStructure(tree);
Collection<TypedDependency> tdl = gs.typedDependenciesCCprocessed();
System.out.println(tdl);
}