Aegisub/aegisub/libaegisub/common/mru.cpp

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// Copyright (c) 2010, Amar Takhar <verm@aegisub.org>
//
// Permission to use, copy, modify, and distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// $Id$
/// @file mru.cpp
/// @brief Most Recently Used (MRU) Lists
/// @ingroup libaegisub
#ifndef LAGI_PRE
#include <fstream>
#include <time.h>
#include "libaegisub/cajun/reader.h"
#include "libaegisub/cajun/writer.h"
#include "libaegisub/cajun/elements.h"
#endif
#include "libaegisub/access.h"
#include "libaegisub/log.h"
#include "libaegisub/mru.h"
#include "libaegisub/io.h"
namespace agi {
MRUManager::MRUManager(const std::string &config, const std::string &default_config): config_name(config) {
LOG_D("agi/mru") << "Loading MRU List";
json::UnknownElement root;
std::istream *stream;
try {
stream = io::Open(config);
} catch (const acs::AcsNotFound&) {
stream = new std::istringstream(default_config);
}
try {
json::Reader::Read(root, *stream);
} catch (const json::Exception&) {
/// @todo Do something better here, maybe print the exact error
// std::cout << "json::Exception: " << e.what() << std::endl;
delete stream;
stream = new std::istringstream(default_config);
json::Reader::Read(root, *stream);
}
const json::Object& root_new = (json::Object)root;
json::Object::const_iterator index_object(root_new.Begin()), index_objectEnd(root_new.End());
for (; index_object != index_objectEnd; ++index_object) {
const json::Object::Member& member = *index_object;
const std::string &member_name = member.name;
const json::UnknownElement& element = member.element;
Load(member_name, (json::Array)element);
}
delete stream;
}
MRUManager::~MRUManager() {
Flush();
for (MRUMap::iterator i = mru.begin(); i != mru.end(); ++i) {
delete i->second;
}
}
void MRUManager::Add(const std::string &key, const std::string &entry) {
MRUMap::iterator index;
if ((index = mru.find(key)) != mru.end()) {
MRUListMap &map = *index->second;
// Remove the file before adding it.
Remove(key, entry);
map.insert(std::pair<time_t, std::string>(time(NULL), entry));
Prune(map);
} else {
throw MRUErrorInvalidKey("Invalid key value");
}
}
void MRUManager::Remove(const std::string &key, const std::string &entry) {
MRUMap::iterator index;
if ((index = mru.find(key)) != mru.end()) {
MRUListMap &map = *index->second;
for (MRUListMap::iterator map_idx = map.begin(); map_idx != map.end();) {
if (map_idx->second == entry)
map.erase(map_idx++);
else
++map_idx;
}
} else {
throw MRUErrorInvalidKey("Invalid key value");
}
}
const MRUManager::MRUListMap* MRUManager::Get(const std::string &key) {
MRUMap::iterator index;
if ((index = mru.find(key)) != mru.end()) {
return index->second;
} else {
throw MRUErrorInvalidKey("Invalid key value");
}
}
const std::string MRUManager::GetEntry(const std::string &key, const int entry) {
const MRUManager::MRUListMap *map = Get(key);
MRUListMap::const_iterator index = map->begin();;
if ((unsigned int)entry > map->size())
throw MRUErrorIndexOutOfRange("Requested element index is out of range.");
std::advance(index, entry);
return index->second;
}
void MRUManager::Flush() {
json::Object out;
for (MRUMap::const_iterator i = mru.begin(); i != mru.end(); ++i) {
json::Array array;
MRUListMap *map_list = i->second;
for (MRUListMap::const_iterator i_lst = map_list->begin(); i_lst != map_list->end(); ++i_lst) {
json::Object obj;
obj["time"] = json::Number((double)i_lst->first);
obj["entry"] = json::String(i_lst->second);
array.Insert(obj);
}
out[i->first] = array;
}
io::Save file(config_name);
std::ofstream& ofp = file.Get();
json::Writer::Write(out, ofp);
}
/// @brief Prune MRUListMap to the desired length.
/// This uses the user-set values for MRU list length.
inline void MRUManager::Prune(MRUListMap& map) {
unsigned int size = 16;
MRUListMap::iterator index = map.begin();;
if (map.size() >= size) {
std::advance(index, size);
// Use a range incase the storage number shrinks.
map.erase(index, map.end());
}
}
/// @brief Load MRU Lists.
/// @param key List name.
/// @param array json::Array of values.
void MRUManager::Load(const std::string &key, const json::Array& array) {
json::Array::const_iterator index(array.Begin()), indexEnd(array.End());
MRUListMap *map = new MRUListMap();
for (; index != indexEnd; ++index) {
const json::Object& obj = *index;
time_t time = (time_t)(json::Number)obj["time"];
std::string entry = (json::String)obj["entry"];
map->insert(std::pair<time_t, std::string>(time, entry));
}
mru.insert(std::pair<std::string, MRUListMap*>(key, map));
Prune(*map);
}
}