Module: JavaHashCode

Defined in:
lib/java_hash_code.rb,
lib/java_hash_code/version.rb

Constant Summary collapse

VERSION = 
'0.0.1'

Class Method Summary collapse

Class Method Details

.compute(string_value) ⇒ Object

Computes hash for given string with Java hashCode algorithm

Example

JavaHashCode.compute('1234')    # 1509442
JavaHashCode.compute('ABC abc') # -489353340
JavaHashCode.compute('АБВ')     # 1032753



12
13
14
15
16
17
18
19
20
21
22
23
 
# File 'lib/java_hash_code.rb', line 12

def self.compute(string_value)
  return 0 if string_value.nil? || string_value.empty?
  hash = 0

  power = string_value.size - 1
  string_value.each_char do |char|
    hash += char.ord * (31 ** power)
    power -= 1
  end

  [hash].pack('L').unpack('l')[0]
end