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authorBoris Kolpackov <boris@codesynthesis.com>2009-09-17 07:15:29 +0200
committerBoris Kolpackov <boris@codesynthesis.com>2009-09-17 07:15:29 +0200
commitf0510d2f90467de8e8f260b47d79a9baaf9bef17 (patch)
tree0b9929946f06a9cbe9b9e8f2a7600dae4e048f79 /examples/cxx/parser/polyroot/driver.cxx
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+// file : examples/cxx/parser/polyroot/driver.cxx
+// author : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <map>
+#include <string>
+#include <iostream>
+
+#include "supermen-pimpl.hxx"
+
+using std::cerr;
+using std::endl;
+using xml_schema::ro_string;
+
+// Customize the xml_schema::document object to handle polymorphic
+// root element. For more information see the multiroot example.
+//
+class document: public xml_schema::document
+{
+public:
+ document (const xml_schema::parser_map& parser_map)
+ : xml_schema::document (true), // Indicate polymorphic parsing.
+ parser_map_ (parser_map)
+ {
+ }
+
+protected:
+ // This function is called to obtain the root element type parser.
+ // If the returned pointer is 0 then the whole document content
+ // is ignored. The type argument contains the XML Schema type
+ // if xsi:type attribute was specified for this element and 0
+ // otherwise.
+ //
+ virtual xml_schema::parser_base*
+ start_root_element (const ro_string& ns,
+ const ro_string& name,
+ const ro_string* type)
+ {
+ if (name != "person" || !ns.empty ())
+ return 0;
+
+ xml_schema::parser_base* base;
+
+ // Search the parser map.
+ //
+ if (type == 0)
+ {
+ // No xsi:type. Static type should be used.
+ //
+ ro_string st (person_pskel::_static_type ());
+ base = parser_map_.find (st);
+ }
+ else
+ {
+ base = parser_map_.find (*type);
+ }
+
+ if (base != 0)
+ {
+ parser_used_ = dynamic_cast<person_pskel*> (base);
+ parser_used_->pre ();
+ }
+ else
+ parser_used_ = 0; // No parser for this type.
+
+ return parser_used_;
+ }
+
+ // This function is called to indicate the completion of document
+ // parsing. The parser argument contains the pointer returned by
+ // start_root_element.
+ //
+ virtual void
+ end_root_element (const ro_string& /* ns */,
+ const ro_string& /* name */,
+ xml_schema::parser_base* /* parser */)
+ {
+ // Instead of caching the current parser in parser_used_, we
+ // could also dynamic_cast the parser argument to the person_pskel
+ // type.
+ //
+ if (parser_used_)
+ parser_used_->post_person ();
+ }
+
+
+private:
+ const xml_schema::parser_map& parser_map_;
+ person_pskel* parser_used_;
+};
+
+int
+main (int argc, char* argv[])
+{
+ if (argc != 2)
+ {
+ cerr << "usage: " << argv[0] << " instance.xml" << endl;
+ return 1;
+ }
+
+ try
+ {
+ // Construct the parser.
+ //
+ xml_schema::string_pimpl string_p;
+ xml_schema::boolean_pimpl boolean_p;
+ xml_schema::unsigned_int_pimpl unsigned_int_p;
+
+ person_pimpl person_p;
+ superman_pimpl superman_p;
+ batman_pimpl batman_p;
+
+ person_p.parsers (string_p);
+ superman_p.parsers (string_p, boolean_p);
+ batman_p.parsers (string_p, boolean_p, unsigned_int_p);
+
+ // Parse the XML document.
+ //
+ xml_schema::parser_map_impl person_map;
+
+ person_map.insert (person_p);
+ person_map.insert (superman_p);
+ person_map.insert (batman_p);
+
+ document doc_p (person_map);
+
+ doc_p.parse (argv[1]);
+ }
+ catch (const xml_schema::exception& e)
+ {
+ cerr << e << endl;
+ return 1;
+ }
+ catch (const std::ios_base::failure&)
+ {
+ cerr << argv[1] << ": unable to open or read failure" << endl;
+ return 1;
+ }
+}