/**
* Requires vn to point to a relation element. From there it iterates over all matches of the ap.
* Puts an empty list for each referenced way.
*/
private List<Tuple2<WayRole, Long>> extractWayRefs(VTDNav vn, Hashtable<Long, List<Long>> ways)
throws NavException, XPathEvalException {
vn.push();
List<Tuple2<WayRole, Long>> refs = new ArrayList<>();
for (int j = MEMBER_WAY_PATH.evalXPath(); j != -1; j = MEMBER_WAY_PATH.evalXPath()) {
long ref = Long.parseLong(vn.toString(vn.getAttrVal("ref")));
String roleAsString = vn.toString(vn.getAttrVal("role")).toLowerCase();
WayRole role;
switch (roleAsString) {
case "inner":
role = WayRole.INNER;
break;
case "outer":
role = WayRole.OUTER;
break;
default:
continue;
}
refs.add(Tuple.tuple(role, ref));
ways.put(ref, Collections.emptyList());
}
MEMBER_WAY_PATH.resetXPath();
vn.pop();
return refs;
}
@Override
public <U, I> Stream<Tuple3<U, I, Double>> read(InputStream in, Parser<U> up, Parser<I> ip)
throws IOException {
return new BufferedReader(new InputStreamReader(in))
.lines()
.map(
line -> {
CharSequence[] tokens = split(line, '\t', 3);
U user = up.parse(tokens[0]);
I item = ip.parse(tokens[1]);
return Tuple.tuple(user, item, 1.0);
});
}
