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// libTorrent - BitTorrent library
// Copyright (C) 2005-2007, Jari Sundell
//
// This program 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 2 of the License, or
// (at your option) any later version.
//
// This program 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 this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// In addition, as a special exception, the copyright holders give
// permission to link the code of portions of this program with the
// OpenSSL library under certain conditions as described in each
// individual source file, and distribute linked combinations
// including the two.
//
// You must obey the GNU General Public License in all respects for
// all of the code used other than OpenSSL. If you modify file(s)
// with this exception, you may extend this exception to your version
// of the file(s), but you are not obligated to do so. If you do not
// wish to do so, delete this exception statement from your version.
// If you delete this exception statement from all source files in the
// program, then also delete it here.
//
// Contact: Jari Sundell <jaris@ifi.uio.no>
//
// Skomakerveien 33
// 3185 Skoppum, NORWAY
#ifndef LIBTORRENT_OBJECT_H
#define LIBTORRENT_OBJECT_H
#include <cstring>
#include <string>
#include <map>
#include <list>
#include <torrent/common.h>
#include <torrent/exceptions.h>
namespace torrent {
// Add support for the GCC move semantics.
//
// Not today?
class ObjectRefRef;
class LIBTORRENT_EXPORT Object {
public:
typedef int64_t value_type;
typedef std::string string_type;
typedef std::list<Object> list_type;
typedef std::map<std::string, Object> map_type;
typedef map_type::key_type key_type;
// Figure a better name for this?
typedef uint32_t state_type;
enum type_type {
TYPE_NONE,
TYPE_VALUE,
TYPE_STRING,
TYPE_LIST,
TYPE_MAP
};
// The users of the library should only ever set/get the bits in the
// public mask, else risk waking dragons.
//
// Consider if part of the mask should be made to clear upon copy,
// and do so for both private and public?
static const state_type mask_private = 0x0000ffff;
static const state_type mask_public = 0xffff0000;
static const state_type mask_type = 0x000000ff;
// static const state_type flag_const = 0x000000;
static const state_type flag_reference = 0x100;
static const state_type type_none = TYPE_NONE;
static const state_type type_value = TYPE_VALUE;
static const state_type type_string = TYPE_STRING;
static const state_type type_list = TYPE_LIST;
static const state_type type_map = TYPE_MAP;
// Add ctors that take a use_copy, use_move and use_internal_move
// parameters.
Object() : m_state(type_none) {}
Object(const value_type v) : m_state(type_value), m_value(v) {}
// Don't inline these.
Object(const char* s) : m_state(type_string), m_string(new string_type(s)) {}
Object(const string_type& s) : m_state(type_string), m_string(new string_type(s)) {}
Object(const Object& b);
// Hmm... reconsider this.
explicit Object(type_type t);
~Object() { clear(); }
void clear();
type_type type() const { return (type_type)(m_state & mask_type); }
bool is_value() const { return type() == type_value; }
bool is_string() const { return type() == type_string; }
bool is_list() const { return type() == type_list; }
bool is_map() const { return type() == type_map; }
bool is_reference() const { return m_state & flag_reference; }
// Add _mutable_ to non-const access.
value_type& as_value() { check_throw(type_value); return m_value; }
const value_type& as_value() const { check_throw(type_value); return m_value; }
string_type& as_string() { check_throw(type_string); return *m_string; }
const string_type& as_string() const { check_throw(type_string); return *m_string; }
list_type& as_list() { check_throw(type_list); return *m_list; }
const list_type& as_list() const { check_throw(type_list); return *m_list; }
map_type& as_map() { check_throw(type_map); return *m_map; }
const map_type& as_map() const { check_throw(type_map); return *m_map; }
// Map operations:
bool has_key(const key_type& k) const { check_throw(type_map); return m_map->find(k) != m_map->end(); }
bool has_key_value(const key_type& k) const { check_throw(type_map); return check(m_map->find(k), type_value); }
bool has_key_string(const key_type& k) const { check_throw(type_map); return check(m_map->find(k), type_string); }
bool has_key_list(const key_type& k) const { check_throw(type_map); return check(m_map->find(k), type_list); }
bool has_key_map(const key_type& k) const { check_throw(type_map); return check(m_map->find(k), type_map); }
Object& get_key(const key_type& k);
const Object& get_key(const key_type& k) const;
value_type& get_key_value(const key_type& k) { return get_key(k).as_value(); }
const value_type& get_key_value(const key_type& k) const { return get_key(k).as_value(); }
string_type& get_key_string(const key_type& k) { return get_key(k).as_string(); }
const string_type& get_key_string(const key_type& k) const { return get_key(k).as_string(); }
list_type& get_key_list(const key_type& k) { return get_key(k).as_list(); }
const list_type& get_key_list(const key_type& k) const { return get_key(k).as_list(); }
map_type& get_key_map(const key_type& k) { return get_key(k).as_map(); }
const map_type& get_key_map(const key_type& k) const { return get_key(k).as_map(); }
Object& insert_key(const key_type& k, const Object& b) { check_throw(type_map); return (*m_map)[k] = b; }
void erase_key(const key_type& k) { check_throw(type_map); m_map->erase(k); }
// List operations:
Object& insert_front(const Object& b) { check_throw(type_list); return *m_list->insert(m_list->begin(), b); }
Object& insert_back(const Object& b) { check_throw(type_list); return *m_list->insert(m_list->end(), b); }
// Copy and merge operations:
Object& move(Object& b);
Object& swap(Object& b);
// Only map entries are merged.
Object& merge_move(Object object, uint32_t maxDepth = ~uint32_t());
Object& merge_copy(const Object& object, uint32_t maxDepth = ~uint32_t());
Object& operator = (const Object& b);
private:
inline bool check(map_type::const_iterator itr, state_type t) const;
inline void check_throw(state_type t) const;
state_type m_state;
union {
int64_t m_value;
string_type* m_string;
list_type* m_list;
map_type* m_map;
};
};
// Inline?
//
// Or just replace with specific ctors?
inline
Object::Object(type_type t) :
m_state(t) {
switch (t) {
case TYPE_NONE: break;
case TYPE_VALUE: m_value = value_type(); break;
case TYPE_STRING: m_string = new string_type(); break;
case TYPE_LIST: m_list = new list_type(); break;
case TYPE_MAP: m_map = new map_type(); break;
}
}
inline bool
Object::check(map_type::const_iterator itr, state_type t) const {
return itr != m_map->end() && itr->second.type() == t;
}
inline void
Object::check_throw(state_type t) const {
if (t != type())
throw bencode_error("Wrong object type.");
}
}
#endif
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