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#!/usr/bin/env python3

from .hash_table import HashTable

from number_theory.prime_numbers import next_prime, check_prime

class DoubleHash(HashTable):

"""

Hash Table example with open addressing and Double Hash

"""

def __init__(self, *args, **kwargs):

super().__init__(*args, **kwargs)

def __hash_function_2(self, value, data):

next_prime_gt = next_prime(value % self.size_table) \

if not check_prime(value % self.size_table) else value % self.size_table #gt = bigger than

return next_prime_gt - (data % next_prime_gt)

def __hash_double_function(self, key, data, increment):

return (increment * self.__hash_function_2(key, data)) % self.size_table

def _colision_resolution(self, key, data=None):

i = 1

new_key = self.hash_function(data)

while self.values[new_key] is not None and self.values[new_key] != key:

new_key = self.__hash_double_function(key, data, i) if \

self.balanced_factor() >= self.lim_charge else None

if new_key is None: break

else: i += 1

return new_key

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