Class: GViz::Data

Inherits:
Object
  • Object
show all
Defined in:
lib/g_viz/data.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(data, map) ⇒ Data

Returns a new instance of Data.



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# File 'lib/g_viz/data.rb', line 4

def initialize(data, map)
  @map = map
  @data = data
  @data_type = {}
  import_data_types
end

Class Method Details

.google_data_type(value) ⇒ Object 



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# File 'lib/g_viz/data.rb', line 60

def google_data_type(value)
  if value.is_a?(Numeric)
    data_type = 'number'
  elsif value.is_a?(Date)
    data_type = 'date'
  elsif value.is_a?(DateTime) || value.is_a?(Time)
    data_type = 'datetime'
  elsif value.respond_to?(:to_s)
    if !value.match(/[^0-9.]/)
      data_type = 'number'
    else
      if (a = Date._parse(value)).size >= 3 
        if a.size >= 5
          data_type = 'datetime'
        else
          data_type = 'date'
        end
      else
          data_type = 'string'
      end
    end
  end
  data_type
end

.ruby_to_js(type, value, prune = false) ⇒ Object 



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# File 'lib/g_viz/data.rb', line 85

def ruby_to_js(type, value, prune = false)
  return nil if value.nil? && prune
  return "" if value == "" || value.nil? 
  if type == 'string'
    value = "#{value}"
  elsif type == 'date'
    value = Date.parse(value.to_s)
  elsif type == 'datetime'
    value = DateTime.parse(value.to_s)
  elsif type == 'number'
    value = value.to_s.match(/\./) ? value.to_f : value.to_i
  end
  return value
end

Instance Method Details

#columns ⇒ Object 



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# File 'lib/g_viz/data.rb', line 27

def columns
  data = @map.map do |k, v|
    [@data_type[k], k]
  end
end

#data_name ⇒ Object 



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# File 'lib/g_viz/data.rb', line 55

def data_name
  "data_#{@data.object_id}"
end

#import_data_types ⇒ Object 



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# File 'lib/g_viz/data.rb', line 11

def import_data_types
  found_data_types = Set.new
  @data.each do |x|
    break if found_data_types.size == @map.size
    @map.each do |k, v|
      next if found_data_types.member?(k)
      if x[k]
        @data_type[k] = self.class.google_data_type(x[k]) 
        found_data_types.add([k,v])
      end
    end
  end
  # if there is no data that responds to a mapped value, remove that mapping
  @map -= (@map - found_data_types.to_a)  
end

#rows_hash(prune = false) ⇒ Object 



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# File 'lib/g_viz/data.rb', line 37

def rows_hash(prune = false)
  @data.map do |value|
    @map.inject({}) do |maps, (k, v)|
      maps[k] = self.class.ruby_to_js(@data_type[k], value[k], prune)
      maps
    end
  end
end

#size ⇒ Object 



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# File 'lib/g_viz/data.rb', line 33

def size
  @data.size
end

#to_json ⇒ Object 



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# File 'lib/g_viz/data.rb', line 46

def to_json
  @json ||= begin
    {
      :columns => columns.inject({}){|hash, (k,v)| hash[v] = k; hash},
      :data => rows_hash
    }.to_json
  end
end