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// file : examples/cxx/tree/messaging/driver.cxx
// copyright : not copyrighted - public domain
#include <memory> // std::auto_ptr
#include <string>
#include <fstream>
#include <typeinfo>
#include <iostream>
#include <xercesc/dom/DOM.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xsd/cxx/xml/string.hxx>
#include "dom-parse.hxx"
#include "dom-serialize.hxx"
#include "protocol.hxx"
using namespace std;
using namespace protocol;
using namespace xercesc;
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.
//
XMLPlatformUtils::Initialize ();
try
{
ifstream ifs;
ifs.exceptions (ifstream::badbit | ifstream::failbit);
ifs.open (argv[1]);
auto_ptr<xml_schema::element_type> req, res;
// Parse the XML request to a DOM document using the parse()
// function from dom-parse.hxx.
//
{
xml_schema::dom::auto_ptr<DOMDocument> doc (parse (ifs, argv[1], true));
DOMElement& root (*doc->getDocumentElement ());
req = xml_schema::element_map::parse (root);
}
// We can test which request we've got either using RTTI or by
// comparing the element names, as shown below.
//
if (balance* b = dynamic_cast<balance*> (req.get ()))
{
account_t& a (b->value ());
cerr << "balance request for acc# " << a.account () << endl;
res.reset (new success (balance_t (a.account (), 1000)));
}
else if (req->_name () == withdraw::name ())
{
withdraw& w (static_cast<withdraw&> (*req));
change_t& c (w.value ());
wcerr << "withdrawal request for acc# " << c.account () << ", "
<< "amount: " << c.amount () << endl;
if (c.amount () > 1000)
res.reset (new insufficient_funds (balance_t (c.account (), 1000)));
else
res.reset (new success (balance_t (c.account (), 1000 - c.amount ())));
}
else if (req->_name () == deposit::name ())
{
deposit& d (static_cast<deposit&> (*req));
change_t& c (d.value ());
wcerr << "deposit request for acc# " << c.account () << ", "
<< "amount: " << c.amount () << endl;
res.reset (new success (balance_t (c.account (), 1000 + c.amount ())));
}
// Serialize the response to a DOM document.
//
namespace xml = xsd::cxx::xml;
const XMLCh ls_id [] = {chLatin_L, chLatin_S, chNull};
DOMImplementation* impl (
DOMImplementationRegistry::getDOMImplementation (ls_id));
const string& name (res->_name ());
const string& ns (res->_namespace ());
xml_schema::dom::auto_ptr<DOMDocument> doc (
impl->createDocument (
xml::string (ns).c_str (),
xml::string ("p:" + name).c_str (),
0));
xml_schema::element_map::serialize (*doc->getDocumentElement (), *res);
// Serialize the DOM document to XML using the serialize() function
// from dom-serialize.hxx.
//
cout << "response:" << endl
<< endl;
serialize (cout, *doc);
}
catch (const xml_schema::no_element_info& e)
{
// This exception indicates that we tried to parse or serialize
// an unknown element.
//
cerr << "unknown request: " << e.element_namespace () << "#" <<
e.element_name () << 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;
}
XMLPlatformUtils::Terminate ();
return r;
}
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