Add BitstreamsFormats' listing task

lib/tasks/dbInfo.rake

+namespace :dbinfo do
+  desc "Database Information Tasks"
+
+  task bitstreams_formats: :environment do
+    desc "List bitstreams formats"
+
+    include RepositoriesProxy
+    include Thumbnail::Formats
+
+    # Quantity of LearningObjects fetched on each iteration
+    limit = 1000
+    # Starting point from where LearningObjects will be fetched
+    offset = 0
+
+    bitstreams_formats_hash = Hash.new
+
+    loop do
+      print "\r -> Analysing LearningObjects from #{offset} to #{offset+limit}"
+
+      begin
+        # Get LearningObjects from OrientDB (from offset to offset+limit)
+        learning_objects = learning_object_repository.all_from_offset_to_limit(offset,limit)
+      rescue
+        # Sleeps for a while to wait database's recovery
+        sleep(30.seconds)
+        # Goes to next iteration to retry
+        next
+      else
+        # Terminate loop if there are no more LearningObjects
+        break if learning_objects.empty?
+
+        learning_objects.each do |lo|
+          bitstream_format = File.extname(lo.get_bitstream_filename_of "ORIGINAL")
+          unless bitstreams_formats_hash[bitstream_format].nil?
+            bitstreams_formats_hash[bitstream_format] += 1
+          else
+            bitstreams_formats_hash[bitstream_format] = 1
+          end
+        end
+
+        offset += limit
+      end
+    end
+
+    bitstreams_formats = bitstreams_formats_hash.sort_by {|key, value| value}
+    
+    puts "\n\n"
+    puts "---------------------------------"
+    puts "---- BITSTREAMS FORMATS LIST ----"
+    puts "---------------------------------"
+    puts "Ext\tTotal\tAccepts Thumbnail"
+    puts "---------------------------------"
+    bitstreams_formats.each do |key,value|
+      accepts_thumbnail = accepted_formats.include? key
+      puts "#{key}\t#{value}\t#{accepts_thumbnail}"
+    end
+    puts "---------------------------------"
+    puts "Ext\tTotal\tAccepts Thumbnail"
+    puts "---------------------------------"
+
+  end
+
+end