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+// file : examples/cxx/tree/xpath/driver.cxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory> // std::auto_ptr
+#include <string>
+#include <fstream>
+#include <iostream>
+
+#include <xercesc/dom/DOM.hpp>
+
+#include <xqilla/xqilla-dom3.hpp>
+
+#include <xsd/cxx/xml/string.hxx> // xml::string, xml::transcode
+
+#include "dom-parse.hxx"
+
+#include "people.hxx"
+
+using namespace std;
+using namespace xercesc;
+namespace xml = xsd::cxx::xml;
+
+int
+main (int argc, char* argv[])
+{
+ if (argc != 2)
+ {
+ cerr << "usage: " << argv[0] << " people.xml" << endl;
+ return 1;
+ }
+
+ int r (0);
+
+ // Initialise Xerces-C++ and XQilla.
+ //
+ XQillaPlatformUtils::initialize();
+
+ // Get the XQilla DOMImplementation object with support for XPath.
+ //
+ DOMImplementation* impl (
+ DOMImplementationRegistry::getDOMImplementation(
+ xml::string ("XPath2 3.0").c_str ()));
+
+ try
+ {
+ using namespace people;
+
+ ifstream ifs;
+ ifs.exceptions (ifstream::badbit | ifstream::failbit);
+ ifs.open (argv[1]);
+
+ // Parse the XML file to DOM using the XQilla DOMImplementation.
+ //
+ xml_schema::dom::auto_ptr<xercesc::DOMDocument> dom (
+ parse (ifs, argv[1], true, impl));
+
+ // Parse the DOM document to the object model. We also request that
+ // the DOM document to be associated with the object model.
+ //
+ std::auto_ptr<directory> d (
+ directory_ (dom,
+ xml_schema::flags::keep_dom | xml_schema::flags::own_dom));
+
+ // Obtain the root element and document corresponding to the
+ // directory object.
+ //
+ DOMElement* root (static_cast<DOMElement*> (d->_node ()));
+ DOMDocument* doc (root->getOwnerDocument ());
+
+ // Obtain namespace resolver.
+ //
+ xml_schema::dom::auto_ptr<XQillaNSResolver> resolver (
+ (XQillaNSResolver*)doc->createNSResolver (root));
+
+ // Set the namespace prefix for the people namespace that we can
+ // use reliably in XPath expressions regardless of what is used
+ // in XML documents.
+ //
+ resolver->addNamespaceBinding (
+ xml::string ("p").c_str (),
+ xml::string ("http://www.codesynthesis.com/people").c_str ());
+
+ // Create XPath expression.
+ //
+ xml_schema::dom::auto_ptr<const XQillaExpression> expr (
+ static_cast<const XQillaExpression*> (
+ doc->createExpression (
+ xml::string ("p:directory/person[age > 30]").c_str (),
+ resolver.get ())));
+
+ // Execute the query.
+ //
+ xml_schema::dom::auto_ptr<XPath2Result> r (
+ static_cast<XPath2Result*> (
+ expr->evaluate (doc, XPath2Result::ITERATOR_RESULT, 0)));
+
+ // Iterate over the result.
+ //
+ cout << "Records matching the query:" << endl;
+
+ while (r->iterateNext ())
+ {
+ const DOMNode* n (r->asNode ());
+
+ // Obtain the object model node corresponding to this DOM node.
+ //
+ person* p (
+ static_cast<person*> (
+ n->getUserData (xml_schema::dom::tree_node_key)));
+
+ // Print the data using the object model.
+ //
+ cout << endl
+ << "First : " << p->first_name () << endl
+ << "Last : " << p->last_name () << endl
+ << "Gender : " << p->gender () << endl
+ << "Age : " << p->age () << endl;
+ }
+ }
+ catch(const DOMException& e)
+ {
+ cerr << xml::transcode<char> (e.getMessage ()) << std::endl;
+ r = 1;
+ }
+ catch (const xml_schema::exception& e)
+ {
+ cerr << e << endl;
+ r = 1;
+ }
+ catch (const std::ios_base::failure&)
+ {
+ cerr << argv[1] << ": unable to open or read failure" << endl;
+ r = 1;
+ }
+
+ XQillaPlatformUtils::terminate();
+ return r;
+}