Package dev.frostlake.functions.scalar.conversion

Class ToDouble

java.lang.Object
dev.frostlake.functions.BuiltInFunction
dev.frostlake.functions.scalar.conversion.ToDouble
public class ToDouble extends BuiltInFunction
TO_DOUBLE(expr [, format]). A text with no format is read as the FLOAT cast reads it, and refused with the cast's own sentence (all live-verified): 
   TO_DOUBLE(' 1.5 ')      1.5       the text is trimmed
   TO_DOUBLE('NaN')        NaN       'nan', 'inf', '-inf', 'Infinity' alike, as '…'::DOUBLE reads them
   TO_DOUBLE('1e400')      inf
   TO_DOUBLE('abc')        Numeric value 'abc' is not recognized
   TO_DOUBLE(' ')          Numeric value '' is not recognized       the text echoed trimmed

  • Constructor Details

    • ToDouble

      public ToDouble()

  • 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

    • 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