Class: GoogleBase::Adapter

Inherits:
DataMapper::Adapters::AbstractAdapter
  • Object
show all
Defined in:
lib/googlebase/adapter.rb

Constant Summary collapse

XML_ATTRIBUTES = 
{
  :xmlns => 'http://www.w3.org/2005/Atom',
  'xmlns:g' => 'http://base.google.com/ns/1.0',
  'xmlns:gd' => 'http://schemas.google.com/g/2005'
}

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#dry_run ⇒ Object

Returns the value of attribute dry_run.



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# File 'lib/googlebase/adapter.rb', line 21

def dry_run
  @dry_run
end

#gb ⇒ Object (readonly)

Returns the value of attribute gb.



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# File 'lib/googlebase/adapter.rb', line 20

def gb
  @gb
end

Instance Method Details

#build_xml(resource) ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 115

def build_xml(resource)
  builder = Nokogiri::XML::Builder.new(:encoding => 'UTF-8') do |xml|

    xml.entry(XML_ATTRIBUTES) do
      resource.model.properties.each do |property|
        value = property.get(resource)
        next if value.blank?

        if to_xml = property.options[:to_xml]
          to_xml.call(xml, value)
        elsif not property.options.has_key?(:to_xml)
          xml.send "#{property.field}_", value
        end
      end
    end

  end

  builder.to_xml
end

#create(resources) ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 64

def create(resources)
  result = 0

  resources.each do |resource|
    xml = build_xml(resource)
    url = "http://www.google.com/base/feeds/items"
    url << "?dry-run=true" if @dry_run

    response = @gb.post(url, xml)

    result += 1 if response.status_code == 201
  end

  result
end

#delete(resources) ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 96

def delete(resources)
  result = 0

  resources.each do |resource|
    url = resource.key.first
    url << "?dry-run=true" if @dry_run

    response = @gb.delete(url)

    result += 1 if response.status_code == 200
  end

  result
end

#read(query) ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 23

def read(query)
  records = []

  operands = query.conditions.operands

  if read_one?(operands)

    response = @gb.get(operands.first.value)
    xml = Nokogiri::XML.parse(response.body)

    each_record(xml, query.fields) do |record|
      records << record
    end

  elsif read_all?(operands)

    start    = query.offset + 1
    per_page = query.limit || 250

    url = "http://www.google.com/base/feeds/items?start-index=#{start}&max-results=#{per_page}"

    while url
      response = @gb.get(url)
      xml = Nokogiri::XML.parse(response.body).at('./xmlns:feed')

      each_record(xml, query.fields) do |record|
        records << record
      end

      break if query.limit && query.limit >= records.length
      url = xml.at("./xmlns:link[@rel='next']/@href")
    end

  else
    raise NotImplementedError
    # TODO implement query conditions
  end

  records
end

#token ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 111

def token
  @gb.auth_handler.token
end

#update(attributes, resources) ⇒ Object 



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# File 'lib/googlebase/adapter.rb', line 80

def update(attributes, resources)
  result = 0

  resources.each do |resource|
    xml = build_xml(resource)
    url = resource.key.first
    url << "?dry-run=true" if @dry_run

    response = @gb.put(url, xml)

    result += 1 if response.status_code == 200
  end

  result
end