RowAggregator (OpenRefine 4.0-SNAPSHOT API)

All Superinterfaces:

Combiner<T>, Serializable

All Known Implementing Classes:

AllFacetsAggregator, ExpressionValueFacetAggregator, FacetAggregator, NumericFacetAggregator, RowInRecordAggregator, ScatterplotFacetAggregator, StringFacetAggregator, StringValuesFacetAggregator, TextSearchFacet.TextSearchAggregator, TimeRangeFacetAggregator
```
public interface RowAggregator<T>
extends Combiner<T>
```
Computes a value of type T by aggregation over rows in a grid. Most importantly this is used to compute facet statistics.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`T`	`withRow(T state, long rowId, Row row)`	Adds statistics obtained from a single row to the aggregation state.

Methods inherited from interface org.openrefine.browsing.facets.Combiner
sum

- Method Detail
  - withRow
```
T withRow(T state,
          long rowId,
          Row row)
```
    Adds statistics obtained from a single row to the aggregation state. Given that states are expected to be immutable, this returns a aggregation state object. This function is required to be associative with the combining function: combine(a, withRow(b, rowId, row)) == withRow(combine(a, b), rowId, row)
    
    Parameters:
    
    rowId - the row id of the row to ingest
    
    row - the row to ingest
    
    Returns:
    
    the aggregation state updated with this row