@JsonCreator
public ArithmeticPostAggregator(
@JsonProperty("name") String name,
@JsonProperty("fn") String fnName,
@JsonProperty("fields") List<PostAggregator> fields) {
this.name = name;
this.fnName = fnName;
this.fields = fields;
if (fields.size() <= 1) {
throw new IAE("Illegal number of fields[%s], must be > 1", fields.size());
}
this.op = Ops.lookup(fnName);
if (op == null) {
throw new IAE("Unknown operation[%s], known operations[%s]", fnName, Ops.getFns());
}
}
@Override
public Object compute(Map<String, Object> values) {
Iterator<PostAggregator> fieldsIter = fields.iterator();
double retVal = 0.0;
if (fieldsIter.hasNext()) {
retVal = ((Number) fieldsIter.next().compute(values)).doubleValue();
while (fieldsIter.hasNext()) {
retVal = op.compute(retVal, ((Number) fieldsIter.next().compute(values)).doubleValue());
}
}
return retVal;
}
/** Process results in the UI Thread. */
protected void onPostExecute(Result result) {
mOps.onPostExecute(result, mParam);
}
static {
for (Ops op : Ops.values()) {
lookupMap.put(op.getFn(), op);
}
}
/** Run in a background thread to avoid blocking the UI thread. */
@SuppressWarnings("unchecked")
protected Result doInBackground(Params... params) {
mParam = params[0];
return mOps.doInBackground(mParam);
}
