module Jsus
  module Util
    # Base for any validator class.
    module Validator
      class Base
        # Constructor accepts pool or array or container and adds every file
        # to its source files set.
        def initialize(pool_or_array_or_container)
          self.source_files = pool_or_array_or_container
        end

        # Returns source files for validation
        def source_files
          @source_files ||= []
        end
        alias_method :sources, :source_files

        # Sets source files for validation
        def source_files=(pool_or_array_or_container)
          case pool_or_array_or_container
          when Pool
            @source_files = pool_or_array_or_container.sources.to_a
          when Array
            @source_files = pool_or_array_or_container
          when Container
            @source_files = pool_or_array_or_container.to_a
          end
        end
        alias_method :sources=, :source_files=

        # Returns whether or not given sources conform to given set of rules
        def validate
          validation_errors.empty?
        end

        # List of validation errors, override this method on descendant classes.
        def validation_errors
          []
        end

        # Shortcut for creating and validating a list of items
        def self.validate(*args)
          new(*args).validate
        end
      end
    end
  end # Util
end