class StateStore::BinaryStore
This class provides convertation between Array to binary number and vice versa. Each instance of class have its own set of statuses.
Attributes
states[R]
statuses[R]
total_positions[R]
Public Class Methods
new(statuses)
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# File lib/state_store/binary_store.rb, line 9 def initialize(statuses) raise ArgumentError.new("Only array is accepted.") unless statuses.is_a?(Array) @statuses = statuses @states = statuses.size @total_positions = 2**@states-1 end
Public Instance Methods
has_status?(symbol,value)
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It receives status and value and check if given value match given status.
Example¶ ↑
store = StateStore.new([:read,:write,:execute]) store.has_status?(:read,4) # will be false because 4 is for :write only store.has_status?(:read,5) # will be true because 5 is for :read and :execute
# File lib/state_store/binary_store.rb, line 39 def has_status?(symbol,value) human_array = humanize(value) human_array.include?(symbol) end
humanize(value)
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Method receives value and return Array of statuses that matches current number.
# File lib/state_store/binary_store.rb, line 17 def humanize(value) raise ArgumentError.new("Out of range") if self.total_positions < value humanized_array = value_to_statuses(value) humanized_array.extend(HumanizedArrayOperations) humanized_array end
index(index,state)
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This method receives index and state and will retrun status with given index if state is “1”
# File lib/state_store/binary_store.rb, line 45 def index(index,state) statuses[index] if state.to_s == "1" end
value(humanized_array)
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Method receives Array of statuses and create binary number that respresents this status for store statuses set.
Example¶ ↑
store = StateStore.new([:read,:write,:execute]) store.value([:read,:execute]) # will be interpreted as 101 or 5 store.value([:write,:execute]) # will be interpreted as 011 or 3
# File lib/state_store/binary_store.rb, line 29 def value(humanized_array) raise ArgumentError.new("Out of range") if self.states < humanized_array.size statuses_to_values(humanized_array) end
Private Instance Methods
normalized_array(array)
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# File lib/state_store/binary_store.rb, line 67 def normalized_array(array) (Array.new(self.states - array.size, "0")+ array) end
statuses_to_values(statuses_array)
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# File lib/state_store/binary_store.rb, line 61 def statuses_to_values(statuses_array) self.statuses.map do |status| statuses_array.include?(status) ? "1" : "0" end.join("").to_i(2) end
value_to_binary_array(value)
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# File lib/state_store/binary_store.rb, line 71 def value_to_binary_array(value) value.to_s(2).split("") end
value_to_statuses(value)
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# File lib/state_store/binary_store.rb, line 51 def value_to_statuses(value) result = [] normalized_array(value_to_binary_array(value)).each_with_index do |state,index| if current_status = index(index,state) result << current_status end end result end