Contents

require 'addressable/template'
require 'active_support/core_ext/hash/indifferent_access'

class Frenetic
  class HypermediaLink
    def initialize(link)
      @link = link.with_indifferent_access
    end

    def href(tmpl_data = {})
      if templated?
        expand(tmpl_data)
      else
        @link['href']
      end
    end
    alias_method :to_url, :href

    def templated?
      return false unless hash?
      @link['templated'] == true
    end

    def expandable?(tmpl_data)
      return false unless templated?
      tmpl_data = normalize_data(tmpl_data)
      tmpl_dataset = template.variables & tmpl_data.keys.map(&:to_s)
      tmpl_dataset.size == template.variables.size
    end

    def template
      @template ||= Addressable::Template.new(@link['href'])
    end

    def as_json
      @link
    end

    def rel
      @link['rel']
    end

  private

    def expand(tmpl_data)
      tmpl_data = normalize_data(tmpl_data)
      return template.expand(tmpl_data).to_s if expandable?(tmpl_data)
      fail UnfulfilledLinkTemplate.new(template, tmpl_data)
    end

    def hash?
      @link.is_a?(Hash)
    end

    def normalize_data(data)
      return data if data.is_a?(Hash)
      infer_template_values data
    end

    def infer_template_values(data)
      key = template.variables.first
      {
        key => data
      }
    end
  end
end

Version data entries

4 entries across 4 versions & 1 rubygems

Version	Path
frenetic-3.0.1	lib/frenetic/hypermedia_link.rb
frenetic-3.0.0	lib/frenetic/hypermedia_link.rb
frenetic-2.0.0	lib/frenetic/hypermedia_link.rb
frenetic-1.0.0	lib/frenetic/hypermedia_link.rb