class RPath::Adapter

An RPath adapter makes it possible to evaluate RPath expressions on some type of graph. There are built-in adapters for Nokogiri, REXML, and the filesystem. To build an adapter for another graph type, inherit from {Adapter} and implement the abstract methods. @abstract

Public Instance Methods

adapts?(graph) click to toggle source

Used to infer the adapter when {#RPath} is called without an explicit adapter. The first registered adapter whose {#adapts?} returns true is chosen. The default implementation returns false. @param [Object] graph @return [Boolean] @see RPath @see RPath.use

# File lib/rpath/adapter.rb, line 17
def adapts?(graph)
  false
end
adjacent(vertex) click to toggle source

Returns the vertices adjacent to the given vertex. @abstract @param [Object] vertex @return [Array]

# File lib/rpath/adapter.rb, line 42
def adjacent(vertex)
  raise NotImplementedError
end
attribute(vertex, name) click to toggle source

Returns the value of attribute name of vertex or nil if no such attribute exists. @abstract @param [Object] vertex @param [String, Symbol] name @return [Object, nil]

# File lib/rpath/adapter.rb, line 52
def attribute(vertex, name)
  raise NotImplementedError
end
content(vertex) click to toggle source

Returns the content of vertex or nil if no content exists. @abstract @param [Object] vertex @return [Object, nil]

# File lib/rpath/adapter.rb, line 60
def content(vertex)
  raise NotImplementedError
end
name(vertex) click to toggle source

Returns the name of the given vertex @abstract @param [Object] vertex @return [String]

# File lib/rpath/adapter.rb, line 34
def name(vertex)
  raise NotImplementedError
end
root(graph) click to toggle source

Returns the root of the given graph, the vertex where evaluation begins. The default implementation returns the given graph. the given graph. @param [Object] graph @return [Object]

# File lib/rpath/adapter.rb, line 26
def root(graph)
  graph
end