Implements ability to consolidate widgets (slices and values)

scripts/lua/modules/datamodel/datamodel.lua

@@ -0,0 +1,73 @@
+--
+-- (C) 2021 - ntop.org
+--
+
+-- Import the classes library.
+local classes = require "classes"
+
+-- ##############################################
+
+local datamodel = classes.class()
+
+-- ##############################################
+
+function datamodel:init(labels)
+   self.column_labels = labels
+   self._data         = {} -- Data container
+end
+
+-- ######################################
+
+-- @brief append data to the model.
+-- @param data_key The key identifying the data, i.e., a timestamp (for timeseries) or a string (for histograms)
+-- @param data_values The value or values associated to the data key. Can be a salar or an array.
+-- @param data_url A URL associated to this data identified with `data_key` (optional)
+-- @param data_color A color associated to this data identified with `data_color` (optional)
+function datamodel:append(data_key, data_values, data_url, data_color)
+   -- Always append ordered data
+   self._data[data_key] = {
+      k = data_key,       -- The Key
+      v = data_values,    -- The Values
+      url = data_url,
+      color = data_color,
+   }
+end
+
+-- ######################################
+
+-- @brief Data consolidation to be called after `append`ing data
+function datamodel:consolidate()
+   -- Possibly implemented in subclasses
+end
+
+-- ######################################
+
+-- @brief Returns datamodel data as-is, without any transformation
+function datamodel:get_data()
+   local res = {}
+
+   for k, v in pairsByKeys(self._data) do
+      res[#res + 1] = v
+   end
+
+   return res
+end
+
+-- ######################################
+
+-- Transform and return datamodel data
+function datamodel:transform(transformation)
+   -- TODO: implement transformations
+   if(transformation == "table") then
+   elseif(transformation == "donut") then
+   elseif(transformation == "multibar") then
+   else
+   end
+
+   -- TODO: return transformed data
+   return self:get_data()
+end
+
+-- ######################################
+
+return(datamodel)