#-- copyright
# ReportingEngine
#
# Copyright (C) 2010 - 2014 the OpenProject Foundation (OPF)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# version 3.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
#++

require 'set'

class Report::GroupBy
  include Report::QueryUtils

  def self.all
    Set[engine::GroupBy::SingletonValue]
  end

  def self.reset!
    @all = nil
  end

  def self.all_grouped
    all.group_by(&:applies_for).to_a.sort { |a, b| a.first.to_s <=> b.first.to_s }
  end

  def self.from_hash
    raise NotImplementedError
  end
end