Class: JunglePath::Query::NestedHashSorter

Inherits:
Object
  • Object
show all
Defined in:
lib/jungle_path/query/nested_hash_sorter.rb

Instance Method Summary collapse

Constructor Details

#initialize(paths, sort_orders) ⇒ NestedHashSorter

Returns a new instance of NestedHashSorter.



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 4

def initialize(paths, sort_orders)
	@paths = paths
	@sort_orders = sort_orders
end

Instance Method Details

#get_array_left(a, b) ⇒ Object 



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 48

def get_array_left(a, b)
	values = []
	@paths.each_index do |i|
		keys = @paths[i]
		sort_order = @sort_orders[i]
		if sort_order == :asc
			values << get_value(a, keys)
		else
			values << get_value(b, keys)
		end
	end
	#puts "left values: #{values}."
	values
end

#get_array_right(a, b) ⇒ Object 



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 63

def get_array_right(a, b)
	values = []
	@paths.each_index do |i|
		keys = @paths[i]
		sort_order = @sort_orders[i]
		if sort_order == :asc
			values << get_value(b, keys)
		else
			values << get_value(a, keys)
		end
	end
	#puts "right values: #{values}."
	values
end

#get_value(hash, keys) ⇒ Object 



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 78

def get_value(hash, keys)
	#extract a value from a nested hash
	#puts "get_value:\n  hash: #{hash}\n  keys: #{keys}."
	#puts ""
	h = hash
	keys.each do |key|
		if h.class == Array
			h = h[0][key]
		else
			h = h[key]
		end
	end
	h
end

#sort(a, b) ⇒ Object 



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 9

def sort(a, b)
	#value = get_array_left(a, b) <=> get_array_right(a, b)
	#can't do the above if some of the array values can be nil. Instead look at each array item individually and handle any nils:
	#puts 'in sort'
	value = sort_handle_nils(get_array_left(a, b), get_array_right(a, b))
	value
end

#sort_handle_nils(array_a, array_b) ⇒ Object 



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# File 'lib/jungle_path/query/nested_hash_sorter.rb', line 17

def sort_handle_nils(array_a, array_b)
	#puts 'in sort_handle_nils'
	#puts "array_a: #{array_a}."
	#puts "array_b: #{array_b}."
	i = 0
	value = 0
	while i < array_a.length and value == 0
		v = 0
		a = array_a[i]
		b = array_b[i]
		#puts "a: #{a}."
		#puts "b: #{b}."
		a = 1 if a.class == TrueClass
		a = 0 if a.class == FalseClass
		b = 1 if b.class == TrueClass
		b = 0 if b.class == FalseClass
		if a == nil and b == nil
			v = 0
		elsif a == nil
			v = -1
		elsif b == nil
			v = 1
		else
			v = a <=> b
		end
		value = v
		i = i + 1
	end
	value
end