thin-provisioning-tools/base/xml_utils.h

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#ifndef BASE_XML_UTILS_H
#define BASE_XML_UTILS_H
#include <base/progress_monitor.h>
#include <boost/lexical_cast.hpp>
#include <boost/optional.hpp>
#include <expat.h>
#include <iosfwd>
#include <map>
#include <stdexcept>
using namespace std;
//----------------------------------------------------------------
namespace xml_utils {
// Simple wrapper to ensure the parser gets freed if an exception
// is thrown during parsing.
class xml_parser {
public:
xml_parser()
: parser_(XML_ParserCreate(NULL)) {
if (!parser_)
throw runtime_error("couldn't create xml parser");
}
~xml_parser() {
XML_ParserFree(parser_);
}
XML_Parser get_parser() {
return parser_;
}
void parse(std::string const &backup_file, bool quiet);
private:
size_t get_file_length(string const &file) const;
auto_ptr<base::progress_monitor> create_monitor(bool quiet);
XML_Parser parser_;
};
typedef std::map<std::string, std::string> attributes;
void build_attributes(attributes &a, char const **attr);
template <typename T>
T get_attr(attributes const &attr, string const &key) {
attributes::const_iterator it = attr.find(key);
if (it == attr.end()) {
ostringstream out;
out << "could not find attribute: " << key;
throw runtime_error(out.str());
}
return boost::lexical_cast<T>(it->second);
}
template <typename T>
boost::optional<T> get_opt_attr(attributes const &attr, string const &key) {
typedef boost::optional<T> rtype;
attributes::const_iterator it = attr.find(key);
if (it == attr.end())
return rtype();
return rtype(boost::lexical_cast<T>(it->second));
}
}
//----------------------------------------------------------------
#endif