From b0846152c522c859bee2fbce55721d7b79264848 Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Fri, 27 Nov 2009 18:17:22 +0200
Subject: Add XML compression example

---
 examples/cxx/tree/compression/driver.cxx | 125 +++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 examples/cxx/tree/compression/driver.cxx

(limited to 'examples/cxx/tree/compression/driver.cxx')

diff --git a/examples/cxx/tree/compression/driver.cxx b/examples/cxx/tree/compression/driver.cxx
new file mode 100644
index 0000000..db285cf
--- /dev/null
+++ b/examples/cxx/tree/compression/driver.cxx
@@ -0,0 +1,125 @@
+// file      : examples/cxx/tree/compression/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#include <memory>   // std::auto_ptr
+#include <fstream>
+#include <iostream>
+
+#include <xercesc/util/PlatformUtils.hpp>
+
+#include "library.hxx"
+
+#include "compressed-input-source.hxx"
+#include "compressed-format-target.hxx"
+
+using namespace std;
+
+int
+main (int argc, char* argv[])
+{
+  if (argc != 2)
+  {
+    cerr << "usage: " << argv[0] << " library.xml" << endl;
+    return 1;
+  }
+
+  int r (0);
+
+  // We need to initialize the Xerces-C++ runtime because we are
+  // using the Xerces-C++ input/output interfaces.
+  //
+  xercesc::XMLPlatformUtils::Initialize ();
+
+  try
+  {
+    using namespace library;
+
+    // Read in the XML file and obtain its object model.
+    //
+    ifstream ifs;
+    ifs.exceptions (ifstream::badbit | ifstream::failbit);
+    ifs.open (argv[1], ifstream::in | ifstream::binary);
+
+    compressed_input_source cis (ifs, compressed_input_source::gzip, argv[1]);
+
+    std::auto_ptr<catalog> c (
+      catalog_ (cis, xml_schema::flags::dont_initialize));
+
+
+    // Let's print what we've got.
+    //
+    for (catalog::book_const_iterator bi (c->book ().begin ());
+         bi != c->book ().end ();
+         ++bi)
+    {
+      cerr << endl
+           << "ID           : " << bi->id () << endl
+           << "ISBN         : " << bi->isbn () << endl
+           << "Title        : " << bi->title () << endl
+           << "Genre        : " << bi->genre () << endl;
+
+      for (book::author_const_iterator ai (bi->author ().begin ());
+           ai != bi->author ().end ();
+           ++ai)
+      {
+        cerr << "Author       : " << ai->name () << endl;
+        cerr << "  Born       : " << ai->born () << endl;
+
+        if (ai->died ())
+          cerr << "  Died       : " << *ai->died () << endl;
+
+        if (ai->recommends ())
+          cerr << "  Recommends : " << (*ai->recommends ())->title () << endl;
+      }
+
+      cerr  << "Available    : " << std::boolalpha << bi->available () << endl;
+    }
+
+    // Prepare namespace mapping and schema location information.
+    //
+    xml_schema::namespace_infomap map;
+
+    map["lib"].name = "http://www.codesynthesis.com/library";
+    map["lib"].schema = "library.xsd";
+
+    ofstream ofs;
+    ofs.exceptions (ofstream::badbit | ofstream::failbit | ofstream::eofbit);
+    ofs.open ("out.xml.gz", ofstream::out | ofstream::binary);
+
+    compressed_format_target cft (ofs, compressed_format_target::gzip);
+
+    // Write it out.
+    //
+    catalog_ (cft, *c, map, "UTF-8", xml_schema::flags::dont_initialize);
+
+    // Write out the compression stream trailer. If we don't do this
+    // explicitly, it will be done automatically in the cft's destructor
+    // but then any exceptions that might be throws will be ignored.
+    //
+    cft.close();
+  }
+  catch (const xml_schema::exception& e)
+  {
+    cerr << e << endl;
+    r = 1;
+  }
+  catch (const compression_failure& e)
+  {
+    cerr << "compression failure: " << e.message () << endl;
+    r = 1;
+  }
+  catch (const decompression_failure& e)
+  {
+    cerr << "decompression failure: " << e.message () << endl;
+    r = 1;
+  }
+  catch (const ios_base::failure&)
+  {
+    cerr << "file open or read/write failure" << endl;
+    r = 1;
+  }
+
+  xercesc::XMLPlatformUtils::Terminate ();
+  return r;
+}
-- 
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