Package com.illumon.iris.db.v2.select

Class NullSelectColumn<T>

java.lang.Object

com.illumon.iris.db.v2.select.NullSelectColumn<T>

All Implemented Interfaces:

SelectColumn

public class NullSelectColumn<T>
extends Object
implements SelectColumn

A SelectColumn implementation that can be used to replace columns with NullValueColumnSources

Field Summary

Fields inherited from interface com.illumon.iris.db.v2.select.SelectColumn

ZERO_LENGTH_SELECT_COLUMN_ARRAY

Constructor Summary

Constructors

Constructor	Description
NullSelectColumn(Class<T> type, String name)

Method Summary

Modifier and Type	Method	Description
SelectColumn	copy()	Create a copy of this SelectColumn.
boolean	disallowRefresh()	Should we disallow use of this column for refreshing tables? Some formulas can not be reliably computed with a refreshing table, therefore we will refuse to compute those values.
List<String>	getColumnArrays()	Get a list of the names of column arrays used in this SelectColumn.
List<String>	getColumns()	Get a list of the names of columns used in this SelectColumn.
ColumnSource	getDataView()	Get a ColumnSource that can be used to access the data on demand.
ColumnSource	getLazyView()	Returns a lazily computed view of this column.
MatchPair	getMatchPair()	Get a MatchPair for this column, if applicable.
String	getName()	Get the name of the resultant column.
Class	getReturnedType()	Get the data type stored in the resultant column.
List<String>	initDef(Map<String,com.illumon.dataobjects.ColumnDefinition> columnDefinitionMap)	Initialize any internal column definitions from the provided initial.
List<String>	initInputs(Table table)	Initialize the SelectColumn using the input table and return a list of underlying columns that this SelectColumn is dependent upon.
List<String>	initInputs(Index index, Map<String,? extends ColumnSource> columnsOfInterest)	Initialize the column from the provided set of underlying columns and index.
boolean	isRetain()
WritableSource	newDestInstance(long size)	Create a new WritableSource with sufficient capacity for the rows in the index.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.illumon.iris.db.v2.select.SelectColumn

alwaysEvaluate, alwaysEvaluateCopy, getConstantValueView

Constructor Details

NullSelectColumn

public NullSelectColumn(Class<T> type, String name)

Method Details

initInputs

public List<String> initInputs(Table table)

Description copied from interface: SelectColumn

Initialize the SelectColumn using the input table and return a list of underlying columns that this SelectColumn is dependent upon.

Specified by:

initInputs in interface SelectColumn

Parameters:

table - the table to initialize internals from

Returns:

a list containing all columns from 'table' that the result depends on

initInputs

public List<String> initInputs(Index index, Map<String,? extends ColumnSource> columnsOfInterest)

Description copied from interface: SelectColumn

Initialize the column from the provided set of underlying columns and index.

Specified by:

initInputs in interface SelectColumn

Parameters:

index - the base index

columnsOfInterest - the input columns

Returns:

a list of columns on which the result of this is dependent

initDef

public List<String> initDef(Map<String,com.illumon.dataobjects.ColumnDefinition> columnDefinitionMap)

Description copied from interface: SelectColumn

Initialize any internal column definitions from the provided initial.

Specified by:

initDef in interface SelectColumn

Parameters:

columnDefinitionMap - the starting set of column definitions

Returns:

a list of columns on which the result of this is dependent

getReturnedType

public Class getReturnedType()

Description copied from interface: SelectColumn

Get the data type stored in the resultant column.

Specified by:

getReturnedType in interface SelectColumn

Returns:

the type

getColumns

public List<String> getColumns()

Description copied from interface: SelectColumn

Get a list of the names of columns used in this SelectColumn. Behavior is undefined if none of the init* methods have been called yet.

Specified by:

getColumns in interface SelectColumn

Returns:

the columns used in this SelectColumn

getColumnArrays

public List<String> getColumnArrays()

Description copied from interface: SelectColumn

Get a list of the names of column arrays used in this SelectColumn. Behavior is undefined if none of the init* methods have been called yet.

Specified by:

getColumnArrays in interface SelectColumn

Returns:

the list of column arrays used

getDataView

@NotNull public ColumnSource getDataView()

Description copied from interface: SelectColumn

Get a ColumnSource that can be used to access the data on demand.

Specified by:

getDataView in interface SelectColumn

Returns:

a ColumnSource

getLazyView

@NotNull public ColumnSource getLazyView()

Description copied from interface: SelectColumn

Returns a lazily computed view of this column.

Specified by:

getLazyView in interface SelectColumn

Returns:

a lazily computed column source

getName

public String getName()

Description copied from interface: SelectColumn

Get the name of the resultant column.

Specified by:

getName in interface SelectColumn

Returns:

the name of the column

getMatchPair

public MatchPair getMatchPair()

Description copied from interface: SelectColumn

Get a MatchPair for this column, if applicable.

Specified by:

getMatchPair in interface SelectColumn

Returns:

newDestInstance

public WritableSource newDestInstance(long size)

Description copied from interface: SelectColumn

Create a new WritableSource with sufficient capacity for the rows in the index.

Specified by:

newDestInstance in interface SelectColumn

Parameters:

size - The number of rows to allocate

Returns:

a new WritableSource with sufficient capacity for 'dataSubset'

isRetain

public boolean isRetain()

Specified by:

isRetain in interface SelectColumn

Returns:

disallowRefresh

public boolean disallowRefresh()

Description copied from interface: SelectColumn

Should we disallow use of this column for refreshing tables? Some formulas can not be reliably computed with a refreshing table, therefore we will refuse to compute those values.

Specified by:

disallowRefresh in interface SelectColumn

copy

public SelectColumn copy()

Description copied from interface: SelectColumn

Create a copy of this SelectColumn.

Specified by:

copy in interface SelectColumn

Returns:

an independent copy of this SelectColumn.