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42 lines
1.2 KiB
Python
42 lines
1.2 KiB
Python
#!/usr/bin/env python3
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from hash_table import HashTable
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from number_theory.prime_numbers import check_prime, next_prime
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class DoubleHash(HashTable):
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"""
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Hash Table example with open addressing and Double Hash
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"""
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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def __hash_function_2(self, value, data):
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next_prime_gt = (
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next_prime(value % self.size_table)
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if not check_prime(value % self.size_table)
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else value % self.size_table
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) # gt = bigger than
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return next_prime_gt - (data % next_prime_gt)
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def __hash_double_function(self, key, data, increment):
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return (increment * self.__hash_function_2(key, data)) % self.size_table
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def _collision_resolution(self, key, data=None):
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i = 1
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new_key = self.hash_function(data)
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while self.values[new_key] is not None and self.values[new_key] != key:
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new_key = (
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self.__hash_double_function(key, data, i)
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if self.balanced_factor() >= self.lim_charge
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else None
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)
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if new_key is None:
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break
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else:
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i += 1
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return new_key
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