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# Copyright 2009-2015 CRS4.
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# Licensed under the Apache License, Version 2.0 (the "License"); you may not
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import re

import pydoop.mapreduce.api as api
import pydoop.mapreduce.pipes as pp


class Mapper(api.Mapper):

    def map(self, context):
        words = re.sub('[^0-9a-zA-Z]+', ' ', context.getInputValue()).split()
        for w in words:
            context.emit(w, 1)


class Reducer(api.Reducer):

    def reduce(self, context):
        s = sum(context.values)
        context.emit(context.key, s)

factory = pp.Factory(mapper_class=Mapper, reducer_class=Reducer)


def __main__():
    pp.run_task(factory)
