Class: PolyrexObjects

Inherits:
Object
  • Object
show all
Defined in:
lib/polyrex-objects.rb

Defined Under Namespace

Classes: PolyrexObject

Instance Method Summary collapse

Constructor Details

#initialize(schema, id = '0', node = nil) ⇒ PolyrexObjects

Returns a new instance of PolyrexObjects.



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# File 'lib/polyrex-objects.rb', line 45

def initialize(schema, id='0', node=nil)

  @node = node
  @@id = id

  if schema then
    a = schema.split('/')
    a.shift
    @class_names = []

    a.each do |x|
      name, raw_fields = x.split('[')
      if raw_fields then
        fields = raw_fields.chop.split(',').map &:strip
        @class_names << name.capitalize

        classx = []  
        classx << "class #{name.capitalize} < PolyrexObject"
        classx << "def initialize(node=nil, id='0')"
        classx << "super(node,id)"

        classx << "a = node.xpath('summary/*',&:name)"
        classx << "yaml_fields = a - (#{fields}  + %w(format_mask))"
        classx << "yaml_fields.each do |field|"
        classx << %q(instance_eval "def #{field}; YAML.load(@node.element('summary/#{field}/text()')); end")
        classx << "end"
        
        classx << "@create = PolyrexCreateObject.new('#{schema}', @@id)"
        classx << "end"
        fields.each do |field|
          classx << "def #{field}"
          classx << "  if @node.element('summary/#{field}').nil? then"
          classx << "    @node.element('summary').add Rexle::Element.new('#{field}')"
          classx << "  end"
          classx << "  @node.element('summary/#{field}/text()')"
          classx << "end"
          classx << "def #{field}=(text)"
          classx << "  if @node.element('summary/#{field}').nil? then"
          classx << "    @node.element('summary').add Rexle::Element.new('#{field}', text)"
          classx << "  else"
          classx << "    @node.element('summary/#{field}').text = text"
          classx << "  end"
          classx << "end"
        end
        classx << "end"          

        eval classx.join("\n")
      end
    end

    if @class_names.length < 2 then
      make_def_records(@class_names.first)
    else
      # implement the child_object within each class object
      @class_names[0..-2].reverse.each_with_index do |class_name, k|    

        i = @class_names.length - (k + 1)
        make_def_records(class_name,i)
      end
    end      
    @class_names[1..-1].each_with_index do |class_name, k|    
      eval "#{class_name}.class_eval {        
        def parent()
          #{@class_names[k]}.new(@node.parent.parent, @@id)
        end                
      }"
    end
    
    methodx = @class_names.map do |name|
      %Q(def #{name.downcase}(); #{name}.new(@node, @@id); end)
    end
    
    self.instance_eval(methodx.join("\n"))
  end
end

Instance Method Details

#make_def_records(class_name, i = 0) ⇒ Object 



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# File 'lib/polyrex-objects.rb', line 121

def make_def_records(class_name, i=0)

  eval "#{class_name}.class_eval { 
    def records()
      objects = @node.xpath('records/*').map {|record| #{@class_names[i]}.new(record, @@id)}

      def objects.records=(node); @node = node; end
      def objects.records(); @node; end

      def objects.sort_by!(&element_blk)
        a = @node.xpath('records/*').sort_by &element_blk
        records = @node.xpath('records')
        records.delete
        records = Rexle::Element.new 'records'
        a.each {|record| records.add record}
        @node.add records
        @node.xpath('records/*').map {|record| #{@class_names[i]}.new(record)}
      end

      objects.records = @node
      objects
    end        
            
    alias #{@class_names[i].downcase} records
    
  }"

end

#to_a ⇒ Object 



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# File 'lib/polyrex-objects.rb', line 150

def to_a
  @class_names.map {|x| eval(x)}
end

#to_h ⇒ Object 



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# File 'lib/polyrex-objects.rb', line 154

def to_h
  Hash[self.to_a.map {|x| [x.name[/\w+$/], x]}]
end