# File lib/rake.rb, line 671
671:     def investigation
672:       result = "------------------------------\n"
673:       result << "Investigating #{name}\n"
674:       result << "class: #{self.class}\n"
675:       result <<  "task needed: #{needed?}\n"
676:       result <<  "timestamp: #{timestamp}\n"
677:       result << "pre-requisites: \n"
678:       prereqs = @prerequisites.collect {|name| application[name]}
679:       prereqs.sort! {|a,b| a.timestamp <=> b.timestamp}
680:       prereqs.each do |p|
681:         result << "--#{p.name} (#{p.timestamp})\n"
682:       end
683:       latest_prereq = @prerequisites.collect{|n| application[n].timestamp}.max
684:       result <<  "latest-prerequisite time: #{latest_prereq}\n"
685:       result << "................................\n\n"
686:       return result
687:     end