IGroupBySummaryProvider (Nebula NatTable 2.0.0-SNAPSHOT API)

All Known Implementing Classes:

SummationGroupBySummaryProvider
```
public interface IGroupBySummaryProvider<T>
```

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static Object DEFAULT_SUMMARY_VALUE
- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  Object summarize(int columnIndex, List<T> children)

- Field Detail
  - DEFAULT_SUMMARY_VALUE
```
static final Object DEFAULT_SUMMARY_VALUE
```
- Method Detail
  - summarize
```
Object summarize(int columnIndex,
                 List<T> children)
```
    Parameters:
    
    columnIndex - The column index of the column for which the summary should be calculated.
    
    children - The child objects to operate on.
    
    Returns:
    
    The calculated summary value for the column.