io.druid.segment

Class NullDimensionSelector

java.lang.Object

io.druid.segment.NullDimensionSelector

All Implemented Interfaces:

DimensionSelector

public class NullDimensionSelector
extends Object
implements DimensionSelector

Constructor Summary

Constructors

Constructor and Description
NullDimensionSelector()

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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullDimensionSelector

public NullDimensionSelector()

Method Detail

getRow

public IndexedInts getRow()

Description copied from interface: DimensionSelector

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

Specified by:

getRow in interface DimensionSelector

Returns:

all values for the row as an IntBuffer

getValueCardinality

public int getValueCardinality()

Description copied from interface: DimensionSelector

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.

Specified by:

getValueCardinality in interface DimensionSelector

Returns:

the value cardinality

lookupName

public String lookupName(int id)

Description copied from interface: DimensionSelector

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

Specified by:

lookupName in interface DimensionSelector

Parameters:

id - id to lookup the field name for

Returns:

the field name for the given id

lookupId

public int lookupId(String name)

Description copied from interface: DimensionSelector

The ID is the int id value of the field.

Specified by:

lookupId in interface DimensionSelector

Parameters:

name - field name to look up the id for

Returns:

the id for the given field name