thin-provisioning-tools/error_set.h

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// Copyright (C) 2011 Red Hat, Inc. All rights reserved.
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//
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// This file is part of the thin-provisioning-tools source.
//
// thin-provisioning-tools is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// thin-provisioning-tools is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with thin-provisioning-tools. If not, see
// <http://www.gnu.org/licenses/>.
#ifndef ERROR_SET_H
#define ERROR_SET_H
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#include <boost/optional.hpp>
#include <boost/shared_ptr.hpp>
#include <list>
#include <iosfwd>
#include <string>
//----------------------------------------------------------------
namespace persistent_data {
// When checking the metadata for a thin device we don't want to
// stop at the first error. Instead should collect as much
// information as possible. The errors are hierarchical, so the
// user can control how much detail is displayed.
class error_set {
public:
typedef boost::shared_ptr<error_set> ptr;
error_set(std::string const &err);
std::string const &get_description() const;
std::list<error_set::ptr> const &get_children() const;
void add_child(error_set::ptr err);
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void add_child(boost::optional<error_set::ptr> maybe_errs);
void add_child(std::string const &err);
private:
std::string err_;
std::list<error_set::ptr> children_;
};
// The error_selector is a little proxy class used when printing
// errors to a stream.
class error_selector {
public:
error_selector(error_set::ptr errs, unsigned depth);
void print(std::ostream &out) const;
private:
error_set::ptr errs_;
unsigned depth_;
};
std::ostream &operator << (std::ostream &out, error_selector const &errs);
}
//----------------------------------------------------------------
#endif