Groovy method with optional parameters

Question

I would like to write a wrapper method for a webservice  the service accepts 2 mandatory and 3 optional parameters    To have a shorter example  I would like to get the following code working   def myMethod pParm1  1   pParm2  2         println    pParm1   pParm2      myMethod    myMethod  a   myMethod pParm2  a      doesn t work as expected myMethod  b   c     The output is   12 a2  pParm2 a 2 a2 bc   What I would like to achieve is to give one parameter and get 1a as the result  Is this possible  in the laziest way

User · Answer

Can t be done as it stands     The code  def myMethod pParm1  1   pParm2  2        println    pParm1   pParm2       Basically makes groovy create the following methods   Object myMethod  pParm1  pParm2         println   pParm1 pParm2     Object myMethod  pParm1         this myMethod  pParm1   2       Object myMethod         this myMethod   1    2        One alternative would be to have an optional Map as the first param   def myMethod  Map map        String mandatory1  String mandatory2        println    mandatory1    mandatory2    map parm1     1     map parm2     2       myMethod   a    b                      prints  a b 1 2  myMethod   a    b   parm1  value       prints  a b value 2  myMethod   a    b   parm2  2nd         prints  a b 1 2nd    Obviously  documenting this so other people know what goes in the magical map and what the defaults are is left to the reader  -

User · Answer

You can use arguments with default values   def someMethod def mandatory def optional null      if argument  optional  not exist  it turns to  null

User · Answer

Just a simplification of the Tim s answer  The groovy way to do it is using a map  as already suggested  but then let s put the mandatory parameters also in the map  This will look like this  def someMethod def args        println  quot MANDATORY1   args mandatory1  quot      println  quot MANDATORY2   args mandatory2  quot      println  quot OPTIONAL1   args  optional1  quot      println  quot OPTIONAL2   args  optional2  quot     someMethod mandatory1 1  mandatory2 2  optional1 3  with the output  MANDATORY1 1 MANDATORY2 2 OPTIONAL1 3 OPTIONAL2 null  This looks nicer and the advantage of this is that you can change the order of the parameters as you like

[groovy] Groovy method with optional parameters

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