ISummaryProvider (Nebula NatTable 2.0.0-SNAPSHOT API)

All Known Implementing Classes:

SummationSummaryProvider
```
public interface ISummaryProvider
```
Summarizes the values in a column. Used by the SummaryRowLayer to calculate summary values.

Field Summary

Fields
Modifier and Type	Field	Description
`static ISummaryProvider`	`DEFAULT`	This instance will always return `DEFAULT_SUMMARY_VALUE` and does not perform a calculation.
`static Object`	`DEFAULT_SUMMARY_VALUE`
`static ISummaryProvider`	`NONE`	Register this instance to indicate that a summary is not required.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type Method Description

Object summarize(int columnIndex)

- Field Detail
  - DEFAULT_SUMMARY_VALUE
```
static final Object DEFAULT_SUMMARY_VALUE
```
  - NONE
```
static final ISummaryProvider NONE
```
    Register this instance to indicate that a summary is not required. Doing so avoids calls to the ISummaryProvider and is a performance tweak.
  - DEFAULT
```
static final ISummaryProvider DEFAULT
```
    This instance will always return DEFAULT_SUMMARY_VALUE and does not perform a calculation.
- Method Detail
  - summarize
```
Object summarize(int columnIndex)
```
    Parameters:
    
    columnIndex - The column index of the column for which the summary should be calculated.
    
    Returns:
    
    The calculated summary value for the column.