Class: Droonga::Reducer
- Inherits:
-
Object
- Object
- Droonga::Reducer
- Defined in:
- lib/droonga/reducer.rb
Constant Summary collapse
- UNLIMITED =
XXX: We has ULIMITED defined lib/droonga/plugins/search/distributed_search_planner.rb. We should unify it.
-1
Class Method Summary collapse
-
.apply_range(items, range) ⇒ Object
TODO: This is right location?.
Instance Method Summary collapse
-
#initialize(deal) ⇒ Reducer
constructor
A new instance of Reducer.
- #reduce(left_value, right_value) ⇒ Object
Constructor Details
#initialize(deal) ⇒ Reducer
Returns a new instance of Reducer.
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# File 'lib/droonga/reducer.rb', line 41 def initialize(deal) @deal = deal # TODO: deal is good name? end |
Class Method Details
.apply_range(items, range) ⇒ Object
TODO: This is right location?
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# File 'lib/droonga/reducer.rb', line 20 def apply_range(items, range) if items and items.is_a?(Array) offset = range["offset"] || 0 unless offset.zero? items = items[offset..-1] || [] end limit = range["limit"] || 0 unless limit == UNLIMITED items = items[0...limit] end end items end |
Instance Method Details
#reduce(left_value, right_value) ⇒ Object
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# File 'lib/droonga/reducer.rb', line 45 def reduce(left_value, right_value) if left_value.nil? or right_value.nil? return right_value || left_value end reduced_value = nil case @deal["type"] when "and" reduced_value = (left_value and right_value) when "or" reduced_value = (left_value or right_value) when "sum" reduced_value = sum(left_value, right_value) reduced_value = self.class.apply_range(reduced_value, "limit" => @deal["limit"]) when "average" reduced_value = (left_value.to_f + right_value.to_f) / 2 when "sort" reduced_value = merge(left_value, right_value, :operators => @deal["operators"], :key_column => @deal["key_column"]) reduced_value = self.class.apply_range(reduced_value, "limit" => @deal["limit"]) end reduced_value end |