From 5e527213a2430bb3018e5eebd909aef294edf9b5 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Fri, 18 Dec 2020 18:48:46 +0300
Subject: Switch to build2

---
 xsd-examples/cxx/tree/multiroot/driver.cxx | 124 +++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 xsd-examples/cxx/tree/multiroot/driver.cxx

(limited to 'xsd-examples/cxx/tree/multiroot/driver.cxx')

diff --git a/xsd-examples/cxx/tree/multiroot/driver.cxx b/xsd-examples/cxx/tree/multiroot/driver.cxx
new file mode 100644
index 0000000..d22c25e
--- /dev/null
+++ b/xsd-examples/cxx/tree/multiroot/driver.cxx
@@ -0,0 +1,124 @@
+// file      : cxx/tree/multiroot/driver.cxx
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::unique_ptr
+#include <string>
+#include <fstream>
+#include <iostream>
+
+#include <xercesc/dom/DOM.hpp>
+#include <xercesc/util/PlatformUtils.hpp>
+
+#include <xsd/cxx/xml/string.hxx>       // xml::transcode
+
+#include "dom-parse.hxx"
+
+#include "protocol.hxx"
+
+using namespace std;
+using namespace protocol;
+
+// Parse an XML document and return a pointer to request_t which can
+// then be tested with dynamic_cast. If your vocabulary does not have
+// a common base type for all root element types then you can use
+// xml_schema::type which is a base for all generated types.
+//
+unique_ptr<request_t>
+parse (istream& is, const string& id)
+{
+  using namespace xercesc;
+  namespace xml = xsd::cxx::xml;
+
+  // Parse an XML instance to a DOM document using the parse()
+  // function from dom-parse.hxx.
+  //
+  xml_schema::dom::unique_ptr<DOMDocument> doc (parse (is, id, true));
+
+  DOMElement* root (doc->getDocumentElement ());
+
+  string ns (xml::transcode<char> (root->getNamespaceURI ()));
+  string name (xml::transcode<char> (root->getLocalName ()));
+
+  unique_ptr<request_t> r;
+
+  // We could have handled the result directly in this function
+  // instead of returning it as an opaque pointer and using
+  // dynamic_cast later to figure out which request we are dealing
+  // with.
+  //
+  if (ns == "http://www.codesynthesis.com/protocol")
+  {
+    if (name == "balance")
+    {
+      // Use the balance parsing function.
+      //
+      r.reset (balance (*doc).release ());
+    }
+    else if (name == "withdraw")
+    {
+      // Use the withdraw parsing function.
+      //
+      r.reset (withdraw (*doc).release ());
+    }
+  }
+
+  if (r.get () == 0)
+    cerr << "ignoring unknown request: " << ns << "#" << name << endl;
+
+  return r;
+}
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " request.xml" << endl;
+    return 1;
+  }
+
+  int r (0);
+
+  // We need to initialize the Xerces-C++ runtime because we
+  // are doing the XML-to-DOM parsing ourselves.
+  //
+  xercesc::XMLPlatformUtils::Initialize ();
+
+  try
+  {
+    ifstream ifs;
+    ifs.exceptions (ifstream::badbit | ifstream::failbit);
+    ifs.open (argv[1]);
+
+    unique_ptr<request_t> r (parse (ifs, argv[1]));
+
+    // Let's print what we've got.
+    //
+    if (balance_t* b = dynamic_cast<balance_t*> (r.get ()))
+    {
+      cerr << "balance request for acc# " << b->account () << endl;
+    }
+    else if (withdraw_t* w = dynamic_cast<withdraw_t*> (r.get ()))
+    {
+      cerr << "withdrawal request for acc# " << w->account () << ", "
+           << "amount: " << w->amount () << endl;
+    }
+    else
+    {
+      cerr << "unknown request" << endl;
+    }
+  }
+  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;
+  }
+
+  xercesc::XMLPlatformUtils::Terminate ();
+  return r;
+}
-- 
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