module SdbDal

class IndexDescription < DomainAttributeDescription
    include SdbFormatter
 attr_accessor :columns
  

  def self.crypto
    @@crypto||=Crypto.new
    @@crypto
  end
    
  def initialize(name,columns,is_encrypted=false)
    self.name=name
    self.columns=columns
    self.value_type =:string
    self.is_primary_key=false
    self.is_encrypted=is_encrypted
  end
  
  def format_index_entry(attribute_descriptions,attribute_values)
   result=""
      columns.each do |column|
        if column.respond_to?(:transform)
          result << column.transform(attribute_values[column.source_column] )
        else
          result << attribute_descriptions[column].format_for_sdb(attribute_values[column]).to_s
        end
        result << "&"
      end
      
      result
  end
  def format_for_sdb(value)
    #don't encrypt because the individual elements are encrypted
    return value
  end
  
end
end