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Groovy Map as Interface method in JRuby

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Groovy has the as keyword which enables the implementation of a Java interface by using the as keyword, its quite easy to mimic this in JRuby.

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  1. module InvokableHash
  2.    def as(java_ifc)
  3.      # Each method will create a key in the hash which points to a block
  4.      # which is called 
  5.      java_ifc.impl {|name, *args| self[name].call(*args)}
  6.    end
  7. end
  8.  
  9. class Hash
  10.    include InvokableHash
  11. end
  12.  
  13. impl = {
  14.  :i => 10,
  15.  :hasNext => proc { impl[:i] > 0 },
  16.  :next => proc { impl[:i] -= 1 }
  17. }
  18.  
  19. iter = impl.as java.util.Iterator
  20. while (iter.hasNext)
  21.    puts iter.next
  22. end

URL: http://blog.headius.com/2007/12/groovy-in-ruby-implement-interface-with.html

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