module NotRelational

class AttributeRange
  attr_accessor :less_than
  attr_accessor :greater_than
  attr_accessor :less_than_or_equal_to
  attr_accessor :greater_than_or_equal_to
  attr_accessor :attribute_description #if this exists we act on objects else we act on attributes
  
  def initialize(options)
      
    self.attribute_description=options[:attribute_description]
      
    self.less_than=options[:less_than]
    self.greater_than=options[:greater_than]
    self.less_than_or_equal_to=options[:less_than_or_equal_to]
    self.greater_than_or_equal_to=options[:greater_than_or_equal_to]
    
  end
  def matches?(arg)
    value=arg
    if self.attribute_description
      #its an object so pull out the value
      value=arg[attribute_description.name]
    end
    return false if value==nil
    return false if self.less_than                && (value <=> self.less_than)               >-1
    return false if self.less_than_or_equal_to    && (value <=> self.less_than_or_equal_to)   ==1
    return false if self.greater_than             && (value<=>self.greater_than)              <1
    return false if self.greater_than_or_equal_to &&(value<=>self.greater_than_or_equal_to)   ==-1
    
    return true
  end
  def to_sdb_query
    query=''
    if self.less_than 
      query << "  '#{attribute_description.name}' < '#{ attribute_description.format_for_sdb( self.less_than)}'"
    end
    if self.greater_than  
      query << ' and ' if query.length>0
      query << "  '#{attribute_description.name}' > '#{ attribute_description.format_for_sdb( self.greater_than)}'"
    end
    if  self.less_than_or_equal_to 
      query << ' and ' if query.length>0
      query << "  '#{attribute_description.name}' <= '#{ attribute_description.format_for_sdb( self.less_than_or_equal_to)}'"
    end
    if  self.greater_than_or_equal_to 
      query << ' and ' if query.length>0
      query << "  '#{attribute_description.name}' >= '#{ attribute_description.format_for_sdb( self.greater_than_or_equal_to)}'"
    end
             
    return  query
  end
  
end
  
end