Package dev.frostlake.functions.scalar.conditional

Class Decode

java.lang.Object
dev.frostlake.functions.BuiltInFunction
dev.frostlake.functions.scalar.conditional.Decode
public class Decode extends BuiltInFunction
DECODE(expr, search1, result1 [, search2, result2 ...] [, default]) Like a searched CASE: compares expr to each search value and returns the matching result. NULL-safe: NULL == NULL is true.

  • Constructor Details

    • Decode

      public Decode()

  • Method Details

    • 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

    • evaluate

      public Object evaluate(List<Object> args, CollationSpec collation)
      Under a collation a search value matches what the collation calls equal to the subject.
      Overrides:
      evaluate in class BuiltInFunction
      Parameters:
      args - the argument values, in call order
      collation - the collation the call settled on, or null when it carries none
      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