Package com.illumon.iris.db.tables.select

Class SelectColumnFactory

java.lang.Object

com.illumon.iris.db.tables.select.SelectColumnFactory

public class SelectColumnFactory
extends Object

A factory to create SelectColumns from an input expression. There are two types of supported expressions

• By Existing column - Simply the name of an existing column in the table
• ResultColumn = <Expression> - Where the expression may simply identify a column from the source, or be something more sophisticated.

Constructor Summary

Constructors

Constructor	Description
SelectColumnFactory()

Method Summary

Modifier and Type	Method	Description
static SelectColumn	getExpression(String expression)	Create a SelectColumn based on the expression.
static SelectColumn[]	getExpressions(String... expressions)	Convert all the supplied expressions into SelectColumns.
static SelectColumn[]	getExpressions(Collection<String> expressions)	Convert all the supplied expressions into SelectColumns.
static String	getFormatBaseColumn(SelectColumn selectColumn)	Returns the base column-name used to create a formatting column via getFormatExpression(String) method
static SelectColumn	getFormatExpression(String expression)
static DhFormulaColumn[]	getFormatExpressions(String... expressions)
static SelectColumn	ofAlwaysUpdate(String expression)	Create a SelectColumn that will always be updated during an update cycle, regardless of the engine's determined set of modified columns.

Methods inherited from class java.lang.Object

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

Constructor Details

SelectColumnFactory

public SelectColumnFactory()

Method Details

ofAlwaysUpdate

@ScriptApi @NotNull public static SelectColumn ofAlwaysUpdate(@NotNull String expression)

Create a SelectColumn that will always be updated during an update cycle, regardless of the engine's determined set of modified columns.

Parameters:

expression - the expression to convert.

Returns:

a new SelectColumn based upon the expression.

getExpression

@ScriptApi @NotNull public static SelectColumn getExpression(@NotNull String expression)

Create a SelectColumn based on the expression.

Parameters:

expression - the expression to convert.

Returns:

a new SelectColumn based upon the expression.

getExpressions

@NotNull public static SelectColumn[] getExpressions(String... expressions)

Convert all the supplied expressions into SelectColumns.

Parameters:

expressions - an array of expressions to convert.

Returns:

an array of SelectColumns, one for each expression.

getExpressions

public static SelectColumn[] getExpressions(Collection<String> expressions)

Convert all the supplied expressions into SelectColumns.

Parameters:

expressions - a collection of expressions to convert.

Returns:

an array of SelectColumns, one for each expression.

getFormatExpression

public static SelectColumn getFormatExpression(String expression)

getFormatExpressions

public static DhFormulaColumn[] getFormatExpressions(String... expressions)

getFormatBaseColumn

public static String getFormatBaseColumn(SelectColumn selectColumn)

Returns the base column-name used to create a formatting column via getFormatExpression(String) method

Parameters:

selectColumn - a SelectColumn returned from the getFormatExpression(String) method

Returns:

the baseColumn used to define the provided selectColumn