RowMapper (OpenRefine 4.0-SNAPSHOT API)

All Superinterfaces:

Serializable

All Known Implementing Classes:

ExpressionBasedOperation.NegativeRowMapper, ExpressionBasedOperation.PositiveRowMapper, RowInRecordMapper
```
public interface RowMapper
extends Serializable
```
A function applied to a row, returning a new row to replace it. Implementations should be stateless. If a state is required, use RowScanMapper. If multiple rows or no rows can be returned, use RowFlatMapper.

Field Summary

Fields
Modifier and Type Field Description

static RowMapper IDENTITY
A row mapper which returns unchanged rows.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`Row`	`call(long rowId, Row row)`
`static RowMapper`	`conditionalMapper(RowFilter filter, RowMapper positive, RowMapper negative)`	Returns a mapper which applies one of the two mappers provided depending on the outcome of the filter.
`default boolean`	`preservesRecordStructure()`	If this mapper is guaranteed to preserve record boundaries (for instance because it does not touch the key column).

- Field Detail
  - IDENTITY
```
static final RowMapper IDENTITY
```
    A row mapper which returns unchanged rows.
- Method Detail
  - call
```
Row call(long rowId,
         Row row)
```
  - preservesRecordStructure
```
default boolean preservesRecordStructure()
```
    If this mapper is guaranteed to preserve record boundaries (for instance because it does not touch the key column).
  - conditionalMapper
```
static RowMapper conditionalMapper(RowFilter filter,
                                   RowMapper positive,
                                   RowMapper negative)
```
    Returns a mapper which applies one of the two mappers provided depending on the outcome of the filter. If the filter evaluates to true, the positive mapper is evaluated, otherwise the negative one is used.
    
    Parameters:
    
    filter - the filter to use for the disjunction
    
    positive - what to do if the filter evaluates to true
    
    negative - what to do otherwise
    
    Returns:
    
    the conditional mapper