/**
* Translates a condition that may be an AND of other conditions. Gathers together conditions
* that apply to the same field.
*/
private Map<String, Object> translateAnd(RexNode node0) {
eqMap.clear();
multimap.clear();
for (RexNode node : RelOptUtil.conjunctions(node0)) {
translateMatch2(node);
}
Map<String, Object> map = builder.map();
for (Map.Entry<String, RexLiteral> entry : eqMap.entrySet()) {
multimap.removeAll(entry.getKey());
map.put(entry.getKey(), literalToString(entry.getValue()));
}
for (Map.Entry<String, Collection<Pair<String, RexLiteral>>> entry :
multimap.asMap().entrySet()) {
Map<String, Object> map2 = builder.map();
for (Pair<String, RexLiteral> s : entry.getValue()) {
map2.put(s.left, literalToString(s.right));
}
map.put(entry.getKey(), map2);
}
return map;
}
private Object translateOr(RexNode condition) {
List<Object> list = new ArrayList<Object>();
for (RexNode node : RelOptUtil.disjunctions(condition)) {
list.add(translateAnd(node));
}
switch (list.size()) {
case 1:
return list.get(0);
default:
Map<String, Object> map = builder.map();
map.put("$or", list);
return map;
}
}
private String translateMatch(RexNode condition) {
Map<String, Object> map = builder.map();
map.put("$match", translateOr(condition));
return builder.toJsonString(map);
}