366 lines
11 KiB
Ruby
366 lines
11 KiB
Ruby
module FeedHelper
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include ApplicationHelper
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# applies rounding to an enumerable object
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def object_round(object, round=nil, match='field')
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object.each_with_index do |o, index|
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object[index] = item_round(o, round, match)
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end
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return object
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end
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# applies rounding to a single item's attributes if necessary
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def item_round(item, round=nil, match='field')
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return nil if item.nil?
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# for each attribute
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item.attribute_names.each do |attr|
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# only add non-null numeric fields
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if attr.index(match) and !item[attr].nil? and is_a_number?(item[attr])
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# keep track of whether the value contains commas
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comma_flag = (item[attr].to_s.index(',')) ? true : false
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# replace commas with decimals if appropriate
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item[attr] = item[attr].to_s.gsub(/,/, '.') if comma_flag
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# do the actual rounding
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item[attr] = sprintf "%.#{round}f", item[attr]
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# replace decimals with commas if appropriate
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item[attr] = item[attr].to_s.gsub(/\./, ',') if comma_flag
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end
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end
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# output new item
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return item
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end
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# gets the median for an object
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def object_median(object, comma_flag=false, round=nil)
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return nil if object.nil?
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length = object.length
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return nil if length == 0
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output = ''
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# do the calculation
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if length % 2 == 0
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output = (object[(length - 1) / 2] + object[length / 2]) / 2
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else
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output = object[(length - 1) / 2]
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end
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output = sprintf "%.#{round}f", output if round and is_a_number?(output)
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# replace decimals with commas if appropriate
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output = output.to_s.gsub(/\./, ',') if comma_flag
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return output.to_s
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end
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# averages a summed object over length
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def object_average(object, length, comma_flag=false, round=nil)
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object.attribute_names.each do |attr|
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# only average non-null integer fields
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if !object[attr].nil? and is_a_number?(object[attr])
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if round
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object[attr] = sprintf "%.#{round}f", (parsefloat(object[attr]) / length)
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else
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object[attr] = (parsefloat(object[attr]) / length).to_s
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end
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# replace decimals with commas if appropriate
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object[attr] = object[attr].gsub(/\./, ',') if comma_flag
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end
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end
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return object
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end
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# formats a summed object correctly
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def object_sum(object, comma_flag=false, round=nil)
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object.attribute_names.each do |attr|
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# only average non-null integer fields
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if !object[attr].nil? and is_a_number?(object[attr])
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if round
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object[attr] = sprintf "%.#{round}f", parsefloat(object[attr])
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else
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object[attr] = parsefloat(object[attr]).to_s
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end
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# replace decimals with commas if appropriate
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object[attr] = object[attr].gsub(/\./, ',') if comma_flag
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end
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end
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return object
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end
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def create_empty_clone(object)
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empty_clone = object.dup
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empty_clone.attribute_names.each { |attr| empty_clone[attr] = nil }
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return empty_clone
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end
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def get_floored_time(input_time, seconds)
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return Time.zone.at((input_time.to_f / seconds).floor * seconds)
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end
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# slice feed into timescales
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def feeds_into_timescales(feeds, params)
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# convert timescale (minutes) into seconds
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seconds = params[:timescale].to_i * 60
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# get floored time ranges
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start_time = get_floored_time(feeds.first.created_at, seconds)
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end_time = get_floored_time(feeds.last.created_at, seconds)
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# create empty array with appropriate size
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timeslices = Array.new((((end_time - start_time) / seconds).abs).floor)
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# create a blank clone of the first feed so that we only get the necessary attributes
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empty_feed = create_empty_clone(feeds.first)
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# add feeds to array
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feeds.each do |f|
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i = ((f.created_at - start_time) / seconds).floor
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f.created_at = start_time + i * seconds
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timeslices[i] = f if timeslices[i].nil?
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end
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# fill in empty array elements
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timeslices.each_index do |i|
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if timeslices[i].nil?
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current_feed = empty_feed.dup
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current_feed.created_at = (start_time + (i * seconds))
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timeslices[i] = current_feed
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end
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end
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return timeslices
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end
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# slice feed into sums
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def feeds_into_sums(feeds, params)
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# convert timescale (minutes) into seconds
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seconds = params[:sum].to_i * 60
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# get floored time ranges
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start_time = get_floored_time(feeds.first.created_at, seconds)
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end_time = get_floored_time(feeds.last.created_at, seconds)
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# create empty array with appropriate size
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timeslices = Array.new((((end_time - start_time) / seconds).abs).floor)
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# create a blank clone of the first feed so that we only get the necessary attributes
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empty_feed = create_empty_clone(feeds.first)
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# add feeds to array
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feeds.each do |f|
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i = ((f.created_at - start_time) / seconds).floor
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f.created_at = start_time + i * seconds
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# create multidimensional array
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timeslices[i] = [] if timeslices[i].nil?
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timeslices[i].push(f)
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end
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# keep track of whether numbers use commas as decimals
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comma_flag = false
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# fill in array
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timeslices.each_index do |i|
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# insert empty values
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if timeslices[i].nil?
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current_feed = empty_feed.dup
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current_feed.created_at = (start_time + (i * seconds))
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timeslices[i] = current_feed
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# else sum the inner array
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else
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sum_feed = empty_feed.dup
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sum_feed.created_at = timeslices[i].first.created_at
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# for each feed
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timeslices[i].each do |f|
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# for each attribute, add to sum_feed so that we have the total
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sum_feed.attribute_names.each do |attr|
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# only add non-null integer fields
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if attr.index('field') and !f[attr].nil? and is_a_number?(f[attr])
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# set comma_flag once if we find a number with a comma
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comma_flag = true if !comma_flag and f[attr].to_s.index(',')
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# set initial data
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if sum_feed[attr].nil?
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sum_feed[attr] = parsefloat(f[attr])
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# add data
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elsif f[attr]
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sum_feed[attr] = parsefloat(sum_feed[attr]) + parsefloat(f[attr])
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end
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end
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end
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end
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# set to the summed feed
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timeslices[i] = object_sum(sum_feed, comma_flag, params[:round])
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end
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end
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return timeslices
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end
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def feeds_into_averages(feeds, params)
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# convert timescale (minutes) into seconds
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seconds = params[:average].to_i * 60
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# get floored time ranges
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start_time = get_floored_time(feeds.first.created_at, seconds)
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end_time = get_floored_time(feeds.last.created_at, seconds)
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# create empty array with appropriate size
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timeslices = Array.new((((end_time - start_time) / seconds).abs).floor)
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# create a blank clone of the first feed so that we only get the necessary attributes
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empty_feed = create_empty_clone(feeds.first)
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# add feeds to array normalizing created time for timeslices
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feeds.each do |f|
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i = ((f.created_at - start_time) / seconds).floor
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f.created_at = start_time + i * seconds
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# create multidimensional array that will hold all feeds for each timeslice
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timeslices[i] = [] if timeslices[i].nil?
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timeslices[i].push(f)
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end
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# keep track of whether numbers use commas as decimals
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comma_flag = false
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# fill in array
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timeslices.each_index do |i|
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# insert empty values if there wasn't a feed value for a slice, just enter an empty feed
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if timeslices[i].nil?
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current_feed = empty_feed.dup
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current_feed.created_at = (start_time + (i * seconds))
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timeslices[i] = current_feed
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# else average the inner array
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else
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sum_feed = empty_feed.dup
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sum_feed.created_at = timeslices[i].first.created_at
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# for each feed
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timeslices[i].each do |f|
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# for each attribute, add to sum_feed so that we have the total
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sum_feed.attribute_names.each do |attr|
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# only add non-null integer fields
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if attr.index('field') and !f[attr].nil? and is_a_number?(f[attr])
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# set comma_flag once if we find a number with a comma
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comma_flag = true if !comma_flag and f[attr].to_s.index(',')
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# set initial data
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if sum_feed[attr].nil?
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sum_feed[attr] = parsefloat(f[attr])
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elsif f[attr] # add data
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sum_feed[attr] = parsefloat(sum_feed[attr]) + parsefloat(f[attr])
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end
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end
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end
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end
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# set to the averaged feed
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timeslices[i] = object_average(sum_feed, timeslices[i].length, comma_flag, params[:round])
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end
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end
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return timeslices
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end
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# slice feed into medians
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def feeds_into_medians(feeds, params)
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# convert timescale (minutes) into seconds
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seconds = params[:median].to_i * 60
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# get floored time ranges
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start_time = get_floored_time(feeds.first.created_at, seconds)
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end_time = get_floored_time(feeds.last.created_at, seconds)
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# create empty array with appropriate size
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timeslices = Array.new((((end_time - start_time) / seconds).abs).floor)
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# create a blank clone of the first feed so that we only get the necessary attributes
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empty_feed = create_empty_clone(feeds.first)
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# add feeds to array
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feeds.each do |f|
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i = ((f.created_at - start_time) / seconds).floor
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f.created_at = start_time + i * seconds
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# create multidimensional array
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timeslices[i] = [] if timeslices[i].nil?
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timeslices[i].push(f)
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end
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# keep track of whether numbers use commas as decimals
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comma_flag = false
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# fill in array
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timeslices.each_index do |i|
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# insert empty values
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if timeslices[i].nil?
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current_feed = empty_feed.dup
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current_feed.created_at = (start_time + (i * seconds))
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timeslices[i] = current_feed
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# else get median values for the inner array
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else
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# create blank hash called 'fields' to hold data
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fields = {}
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# for each feed
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timeslices[i].each do |f|
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# for each attribute
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f.attribute_names.each do |attr|
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if attr.index('field')
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# create blank array for each field
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fields["#{attr}"] = [] if fields["#{attr}"].nil?
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# push numeric field data onto its array
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if is_a_number?(f[attr])
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# set comma_flag once if we find a number with a comma
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comma_flag = true if !comma_flag and f[attr].to_s.index(',')
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fields["#{attr}"].push(parsefloat(f[attr]))
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end
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end
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end
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end
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# sort fields arrays
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fields.each_key do |key|
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fields[key] = fields[key].compact.sort
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end
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# get the median
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median_feed = empty_feed.dup
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median_feed.created_at = timeslices[i].first.created_at
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median_feed.attribute_names.each do |attr|
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median_feed[attr] = object_median(fields[attr], comma_flag, params[:round]) if attr.index('field')
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end
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timeslices[i] = median_feed
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end
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end
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return timeslices
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end
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# checks for valid timescale
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def timeparam_valid?(timeparam)
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valid_minutes = [10, 15, 20, 30, 60, 240, 720, 1440]
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if timeparam and valid_minutes.include?(timeparam.to_i)
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return true
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else
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return false
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end
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end
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end
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