adapter-pattern

1.coffee

# a fragment of 3-rd party grid component
class AwesomeGrid
  constructor: (@datasource)->
    @sort_order = 'ASC'
    @sorter = new NullSorter # in this place we use NullObject pattern (another useful pattern)
  setCustomSorter: (@customSorter) ->
    @sorter = customSorter
  sort: () ->
    @datasource = @sorter.sort @datasource, @sort_order
    # don't forget to change sort order


class NullSorter
  sort: (data, order) -> # do nothing; it is just a stub

class RandomSorter
  sort: (data)->
    for i in [data.length - 1..1] #let's shuffle the data a bit
      j = Math.floor Math.random() * (i + 1)
      [data[i], data[j]] = [data[j], data[i]]
    return data

class RandomSorterAdapter
  constructor: (@sorter) ->
  sort: (data, order) ->
    @sorter.sort data

agrid = new AwesomeGrid ['a', 'b', 'c', 'd', 'e', 'f']
agrid.setCustomSorter new RandomSorterAdapter(new RandomSorter)
agrid.sort() # sort data with custom sorter through adapter