new (Log4r::PatternFormatter)

    # File log4r/formatter/patternformatter.rb, line 57
        def initialize(hash={})
          super(hash)
          @pattern = (hash['pattern'] or hash[pattern:pattern] or nil)
          @date_pattern = (hash['date_pattern'] or hash[date_pattern:date_pattern] or nil)
          @date_method = (hash['date_method'] or hash[date_method:date_method] or nil)
          @date_pattern = ISO8601 if @date_pattern.nil? and @date_method.nil?
          PatternFormatter.create_format_methods(self)
        end