From f0510d2f90467de8e8f260b47d79a9baaf9bef17 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Thu, 17 Sep 2009 07:15:29 +0200
Subject: Start tracking XSD with git

---
 examples/cxx/parser/polyroot/driver.cxx | 139 ++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)
 create mode 100644 examples/cxx/parser/polyroot/driver.cxx

(limited to 'examples/cxx/parser/polyroot/driver.cxx')

diff --git a/examples/cxx/parser/polyroot/driver.cxx b/examples/cxx/parser/polyroot/driver.cxx
new file mode 100644
index 0000000..b04bba5
--- /dev/null
+++ b/examples/cxx/parser/polyroot/driver.cxx
@@ -0,0 +1,139 @@
+// 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;
+  }
+}
-- 
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