@Nonnull
@Override
public OptionalTsData build() {
if (dc.getCount() == 0) {
return onFailure("No data available");
}
if (freq == TsFrequency.Undefined && aggregation != TsAggregationType.None) {
return onFailure("Invalid aggregation mode");
}
TsData result;
if (aggregation == TsAggregationType.None) {
result = dc.make(freq, aggregation);
} else {
result = dc.make(TsFrequency.Undefined, TsAggregationType.None);
if (result != null && (result.getFrequency().intValue() % freq.intValue() == 0)) {
// should succeed
result = result.changeFrequency(freq, aggregation, true);
} else {
result = dc.make(freq, aggregation);
}
}
if (result == null) {
switch (freq) {
case Undefined:
return dc.getCount() == 1
? onFailure("Cannot guess frequency with a single observation")
: onFailure("Cannot guess frequency with duplicated periods");
default:
// TODO: if TsAggregationType.None
}
return onFailure("Unexpected error");
}
return onSuccess(result);
}
@Nonnull
public Builder add(@Nullable Date period, @Nullable Number value) {
if (period != null) {
if (value != null) {
dc.addObservation(period, value.doubleValue());
} else if (!skipMissingValues) {
dc.addMissingValue(period);
}
} else {
nbrUselessRows++;
}
return this;
}
private OptionalTsData onFailure(String cause) {
return new Absent(dc.getCount(), nbrUselessRows, cause);
}
private OptionalTsData onSuccess(TsData tsData) {
return new Present(dc.getCount(), nbrUselessRows, tsData);
}
@Nonnull
public Builder clear() {
dc.clear();
nbrUselessRows = 0;
return this;
}
