io.druid.segment

Interface DimensionSelector

All Known Implementing Classes:

NullDimensionSelector, SingleScanTimeDimSelector

public interface DimensionSelector

Method Summary

Methods

Modifier and Type	Method and Description
IndexedInts	getRow() Gets all values for the row inside of an IntBuffer.
int	getValueCardinality() Value cardinality is the cardinality of the different occurring values.
int	lookupId(String name) The ID is the int id value of the field.
String	lookupName(int id) The Name is the String name of the actual field.

Method Detail

getRow

IndexedInts getRow()

Gets all values for the row inside of an IntBuffer. I.e. one possible implementation could be return IntBuffer.wrap(lookupExpansion(get());

Returns:

all values for the row as an IntBuffer

getValueCardinality

int getValueCardinality()

Value cardinality is the cardinality of the different occurring values. If there were 4 rows: A,B A B A Value cardinality would be 2.

Returns:

the value cardinality

lookupName

String lookupName(int id)

The Name is the String name of the actual field. It is assumed that storage layers convert names into id values which can then be used to get the string value. For example A,B A A,B B getRow() would return getRow(0) => [0 1] getRow(1) => [0] getRow(2) => [0 1] getRow(3) => [1] and then lookupName would return: lookupName(0) => A lookupName(1) => B

Parameters:

id - id to lookup the field name for

Returns:

the field name for the given id

lookupId

int lookupId(String name)

The ID is the int id value of the field.

Parameters:

name - field name to look up the id for

Returns:

the id for the given field name