Class: LibraryThing::NodeWrapper

Inherits:
Object
  • Object
show all
Defined in:
lib/librarything/resource.rb

Overview

Helper class to wrap a Nokogiri node. It includes a simplified method for accessing DOM content.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node) ⇒ NodeWrapper

Creates a new wrapped XML node



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# File 'lib/librarything/resource.rb', line 9

def initialize(node)
  @node = node
end

Instance Attribute Details

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/librarything/resource.rb', line 6

def node
  @node
end

Instance Method Details

#[](name) ⇒ Object

Extracts values from the node.

  • If the name matches the name of an attribute, the value of that attribute will be returned

  • If the name matches the name of a single child element, that element is returned.

  • If the matching child element only contains text data, the text data is returned.

  • If the matching child element is named xxxList, an array of the children of the element is returned

  • If there is more that one matching child element, they are returned as an array.



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# File 'lib/librarything/resource.rb', line 26

def [](name)
  # Check for attributes first. Why? It works for the LT xml (for now).
  if @node.attributes.has_key?(name)
    return @node.attributes[name].value
  end

  # Find child elements with that name
  children = @node.xpath("./lt:#{name}")
  if children.size == 1
    child = children.first
    if self.text_element?(child)
      return child.children.first.content
    elsif child.name =~ /^[\w]*List$/
      # LT-specific hack to simplify access to lists. Ill-advised?
      return wrap_children(child.children)
    else
      return NodeWrapper.new(child)
    end
  elsif children.size > 1
    return wrap_children(children)
  else
    return nil
  end
end

#content ⇒ Object

Returns the content of the node



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# File 'lib/librarything/resource.rb', line 14

def content
  @node.content
end