Class: VCDOM::XPath::XPathNSResolver

Inherits:
Object
  • Object
show all
Defined in:
lib/vcdom/xpath/xpath_ns_resolver.rb

Overview

A XPathNSResolver object permit prefix strings in the expression to be properly bound to namespaceURI strings. XPathEvaluator can construct an implementation of XPathNSResolver from a node, or the interface may be implemented by any application.

Way to create a XPathNSResolver object

If you want a XPathNSResolver object, please use XPathEvaluatorMod#create_expression. The class Document includes the module XPathEvaluatorMod when you required “vcdom/xpath”, so you can use this method as the following:

require "vcdom"
require "vcdom/xpath"
# doc is a Document object
resolver = doc.create_ns_resolver( node )

Instance Method Summary collapse

Constructor Details

#initialize(ns_resolver) ⇒ XPathNSResolver

:nodoc:



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# File 'lib/vcdom/xpath/xpath_ns_resolver.rb', line 22

def initialize( ns_resolver ) # :nodoc:
  @ns_resolver = ns_resolver
end

Instance Method Details

#lookup_namespace_uri(prefix) ⇒ Object

Look up the namespace URI associated to the given namespace prefix. The XPath evaluator must never call this with a null or empty argument, because the result of doing this is undefined.



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# File 'lib/vcdom/xpath/xpath_ns_resolver.rb', line 29

def lookup_namespace_uri( prefix )
  # TODO
  nil
end