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Path.h
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1 //
2 // Copyright (c) 2009, Markus Rickert
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29 
30 #ifndef _RL_XML_PATH_H_
31 #define _RL_XML_PATH_H_
32 
33 #include <string>
34 #include <boost/shared_array.hpp>
35 #include <boost/shared_ptr.hpp>
36 #include <libxml/xpath.h>
37 
38 #include "Document.h"
39 #include "Node.h"
40 #include "Object.h"
41 
42 namespace rl
43 {
44  namespace xml
45  {
46  class Path
47  {
48  public:
49  Path(const Document& doc) :
50  context(xmlXPathNewContext(doc()), xmlXPathFreeContext),
51  doc(doc())
52  {
53  }
54 
55  virtual ~Path()
56  {
57  }
58 
59  Object eval(const ::std::string& expression)
60  {
61  this->context->node = NULL;
62 
63  return Object(
64  xmlXPathEvalExpression(
65  reinterpret_cast< const xmlChar* >(expression.c_str()),
66  this->context.get()
67  )
68  );
69  }
70 
71  Object eval(const ::std::string& expression, const Node& node)
72  {
73  this->context->node = node();
74 
75  return Object(
76  xmlXPathEvalExpression(
77  reinterpret_cast< const xmlChar* >(expression.c_str()),
78  this->context.get()
79  )
80  );
81  }
82 
83  xmlXPathContextPtr operator()() const
84  {
85  return this->context.get();
86  }
87 
88  protected:
89 
90  private:
91  ::boost::shared_ptr< xmlXPathContext > context;
92 
93  xmlDocPtr doc;
94  };
95  }
96 }
97 
98 #endif // _RL_XML_PATH_H_