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class Problem < ActiveRecord::Base
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belongs_to :description
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has_and_belongs_to_many :contests, :uniq => true
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has_many :test_pairs, :dependent => :delete_all
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validates_presence_of :name
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validates_format_of :name, :with => /^\w+$/
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validates_presence_of :full_name
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scope :available, :conditions => {:available => true}
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DEFAULT_TIME_LIMIT = 1
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DEFAULT_MEMORY_LIMIT = 32
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def self.find_available_problems
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Problem.available.all(:order => "date_added DESC")
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end
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def self.create_from_import_form_params(params, old_problem=nil)
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org_problem = old_problem || Problem.new
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import_params, problem = Problem.extract_params_and_check(params,
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org_problem)
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if problem.errors.length!=0
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return problem, 'Error importing'
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end
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problem.full_score = 100
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problem.date_added = Time.new
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problem.test_allowed = true
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problem.output_only = false
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problem.available = false
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if not problem.save
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return problem, 'Error importing'
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end
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import_to_db = params.has_key? :import_to_db
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importer = TestdataImporter.new(problem)
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if not importer.import_from_file(import_params[:file],
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import_params[:time_limit],
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import_params[:memory_limit],
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import_to_db)
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problem.errors.add_to_base('Import error.')
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end
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return problem, importer.log_msg
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end
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def self.download_file_basedir
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return "#{Rails.root}/data/tasks"
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end
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protected
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def self.to_i_or_default(st, default)
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if st!=''
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result = st.to_i
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end
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result ||= default
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end
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def self.to_f_or_default(st, default)
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if st!=''
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result = st.to_f
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end
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result ||= default
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end
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def self.extract_params_and_check(params, problem)
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time_limit = Problem.to_f_or_default(params[:time_limit],
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DEFAULT_TIME_LIMIT)
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memory_limit = Problem.to_i_or_default(params[:memory_limit],
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DEFAULT_MEMORY_LIMIT)
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if time_limit<=0 or time_limit >60
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problem.errors.add_to_base('Time limit out of range.')
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end
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if memory_limit==0 and params[:memory_limit]!='0'
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problem.errors.add_to_base('Memory limit format errors.')
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elsif memory_limit<=0 or memory_limit >512
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problem.errors.add_to_base('Memory limit out of range.')
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end
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if params[:file]==nil or params[:file]==''
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problem.errors.add_to_base('No testdata file.')
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end
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file = params[:file]
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if problem.errors.length!=0
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return nil, problem
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end
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problem.name = params[:name]
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if params[:full_name]!=''
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problem.full_name = params[:full_name]
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else
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problem.full_name = params[:name]
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end
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return [{
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:time_limit => time_limit,
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:memory_limit => memory_limit,
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:file => file
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},
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problem]
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end
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end
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Jittat Fakcharoenphol-