Package dev.frostlake.functions.scalar.string

Class Concat

java.lang.Object

dev.frostlake.functions.BuiltInFunction

dev.frostlake.functions.TextArgumentFunction

dev.frostlake.functions.scalar.string.Concat

public class Concat
extends TextArgumentFunction

Constructor Summary

Constructors

Constructor	Description
Concat()

Method Summary

Modifier and Type	Method	Description
Object	evaluate(List<Object> args)	Computes the function's result over its already-evaluated argument values.
int	getMaxArgCount()	The most arguments a call to this function may pass; Integer.MAX_VALUE marks a variadic function (see BuiltInFunction.isVariadic()).
int	getMinArgCount()	The fewest arguments a call to this function may pass; fewer is an argument-count error.
SemiStructuredRejection	vectorRejection(int position)	CONCAT refuses a VECTOR in ANY position, listing the argument types and carrying a position — the other of the two shapes a vector-to-text refusal takes.

Methods inherited from class dev.frostlake.functions.TextArgumentFunction

semiStructuredRejection

Methods inherited from class dev.frostlake.functions.BuiltInFunction

approximateRejection, binaryRejection, booleanRejection, evaluate, fileRejection, geoRejection, getName, getReturnType, isVariadic, refusesMissingArgumentsByType, structuredRejection, temporalRejection, temporalRejection, temporalRejection, textRejection, uuidRejection

Methods inherited from class java.lang.Object

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

Constructor Details

Concat

public Concat()

Method Details

vectorRejection

public SemiStructuredRejection vectorRejection(int position)

CONCAT refuses a VECTOR in ANY position, listing the argument types and carrying a position — the other of the two shapes a vector-to-text refusal takes. The || spelling of the same operation is refused by the operator's own rule, which reports the function as '||'.

Overrides:

vectorRejection in class TextArgumentFunction

Parameters:

position - the zero-based argument position being asked about

Returns:

the refusal this position gives a VECTOR value; by default none

evaluate

public Object evaluate(List<Object> args)

Description copied from class: BuiltInFunction

Computes the function's result over its already-evaluated argument values. A SQL NULL argument arrives as Java null, and returning null makes the SQL result NULL.

Specified by:

evaluate in class BuiltInFunction

Parameters:

args - the argument values, in call order

Returns:

the function's value for these arguments, or null for SQL NULL

getMinArgCount

public int getMinArgCount()

Description copied from class: BuiltInFunction

The fewest arguments a call to this function may pass; fewer is an argument-count error.

Specified by:

getMinArgCount in class BuiltInFunction

Returns:

the minimum accepted argument count

getMaxArgCount

public int getMaxArgCount()

Description copied from class: BuiltInFunction

The most arguments a call to this function may pass; Integer.MAX_VALUE marks a variadic function (see BuiltInFunction.isVariadic()).

Specified by:

getMaxArgCount in class BuiltInFunction

Returns:

the maximum accepted argument count