private Set<StandardOperation> parseOperations(JSONArray operations) throws JSONException {
final int operationsCount = operations.length();
final Set<StandardOperation> res = Sets.newHashSetWithExpectedSize(operationsCount);
for (int i = 0; i < operationsCount; i++) {
String opName = operations.getString(i);
StandardOperation op = StandardOperation.valueOf(opName.toUpperCase());
res.add(op);
}
return res;
}