class Webgen::PathHandler::MetaInfo

Handles meta information paths which provide meta information for other paths.

Public Class Methods

new(website) click to toggle source

Upon creation the path handler registers itself as listener for the :apply_meta_info_to_path and :after_node_created hooks so that it can apply the meta information.

Calls superclass method Webgen::PathHandler::Base.new

# File lib/webgen/path_handler/meta_info.rb, line 19
def initialize(website)
  super
  @website.blackboard.add_listener(:apply_meta_info_to_path, 'path_handler.meta_info',
                                   &method(:apply_meta_info_to_path))
  @website.blackboard.add_listener(:after_node_created, 'path_handler.meta_info',
                                   :before => 'item_tracker.node_meta_info', &method(:after_node_created))
  @paths = []
  @alcns = []
end

Public Instance Methods

create_nodes(path, blocks) click to toggle source

Create a meta info node from path.

# File lib/webgen/path_handler/meta_info.rb, line 30
def create_nodes(path, blocks)
  @paths += add_data(path, blocks['paths'], 'paths')
  entries = add_data(path, blocks['alcn'], 'alcn')
  @alcns += entries
  update_existing_nodes(entries)

  nil
end

Private Instance Methods

add_data(path, content, block_name) click to toggle source

Add the data from the given page block to the hash.

# File lib/webgen/path_handler/meta_info.rb, line 44
def add_data(path, content, block_name)
  entries = []
  if content && (data = YAML::load(content))
    data.each do |(*keys), value|
      value = Marshal.dump(value)
      keys.each {|key| entries << [Webgen::Path.append(path.parent_path, key), value]}
    end
  end
  entries
rescue Exception => e
  raise Webgen::NodeCreationError.new("Could not parse block '#{block_name}': #{e.message}", "path_handler.meta_info")
end

after_node_created(node) click to toggle source

Update the meta information of a matched alcn after the node has been created.

# File lib/webgen/path_handler/meta_info.rb, line 76
def after_node_created(node)
  @alcns.each do |pattern, mi|
    node.meta_info.update(Marshal.load(mi)) if Webgen::Path.matches_pattern?(node.alcn, pattern)
  end
end

apply_meta_info_to_path(path) click to toggle source

Update the meta info of matched path before a node is created.

# File lib/webgen/path_handler/meta_info.rb, line 67
def apply_meta_info_to_path(path)
  hash = {}
  @paths.each do |pattern, mi|
    hash.merge!(Marshal.load(mi)) if Webgen::Path.matches_pattern?(path, pattern)
  end
  path.meta_info.replace(hash.merge!(path.meta_info)) if hash.length > 0
end

update_existing_nodes(entries) click to toggle source

Update already existing nodes with meta information from the given meta info node.

# File lib/webgen/path_handler/meta_info.rb, line 58
def update_existing_nodes(entries)
  @website.tree.node_access[:alcn].each do |alcn, node|
    entries.each do |pattern, mi|
      node.meta_info.update(Marshal.load(mi)) if Webgen::Path.matches_pattern?(alcn, pattern)
    end
  end
end