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Searcher.cpp
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Searcher.cpp
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#include "Searcher.h"
#include "util.h"
#include <windows.h>
#include <queue>
#include <sstream>
#include <QDebug>
Searcher::Searcher() {
int id = 0;
char lpBuffer[100];
DWORD test = GetLogicalDriveStrings(100, (LPWSTR)lpBuffer);
for (int i = 0; lpBuffer[i] != '\0'; i += 4)
_drivers.push_back(lpBuffer[i]);
for (auto ch : _drivers) {
drivers.push_back(new USNParser(ch));
monitors.push_back(new Monitor(id++, drivers.back()->root_handle, drivers.back()->journal));
indexs.push_back(new FileIndex(drivers.back()));
}
}
void Searcher::parseQuery(std::wstring& query) {
content_result.clear();
path_result.clear();
splited.clear();
size_t loc = query.find(L"\\content:");
if (loc != std::wstring::npos) {
_content = query.substr(loc + 9);
searchContent(_content);
}
_path = loc == std::wstring::npos ? query : query.substr(0, loc);
if (_path.size() > 0)
searchPath(_path);
}
void Searcher::searchPath(std::wstring& path) {
path_result.clear();
splited = strsplit(path);
if (splited.empty()) return;
for (auto driver : drivers) {
std::set<FileEntry*> tmp = driver->query(splited[0]);
for (size_t i = 1; i < splited.size(); ++i) {
auto _tmp = driver->query(splited[i]);
auto it1 = tmp.begin();
auto it2 = _tmp.begin();
while ((it1 != tmp.end()) && (it2 != _tmp.end())) {
if (*it1 < *it2) {
tmp.erase(it1++);
} else if (*it2 < *it1) {
++it2;
} else {
++it1;
++it2;
}
}
tmp.erase(it1);
}
std::copy(tmp.begin(), tmp.end(), std::inserter(path_result, path_result.end()));
}
}
std::vector<std::wstring> Searcher::recommend() const {
std::vector<std::wstring> res;
if (splited.size() != 1) return res;
auto all = path_result.size();
if (all < 2) return res;
std::map<std::wstring, int> cnt;
for (auto result : path_result) {
if (result->full_path.length() == 0) continue;
auto loc = result->full_path.find(splited[0]) + splited[0].size();
for (size_t i = 1; i < 5; ++i) {
if (i + loc > result->full_path.size()) break;
auto word = result->full_path.substr(loc, i);
if (cnt.find(word) == cnt.end())
cnt[word] = 1;
else
cnt[word]++;
}
}
typedef std::function<bool(std::pair<std::wstring, int>, std::pair<std::wstring, int>)> Comparator;
Comparator compFunctor =
[](std::pair<std::wstring, int> elem1, std::pair<std::wstring, int> elem2) { return elem1.second > elem2.second; };
std::set<std::pair<std::wstring, int>, Comparator> sorted_cnt( cnt.begin(), cnt.end(), compFunctor);
for(auto& kvp : sorted_cnt) {
if (kvp.second > all / 3) {
res.push_back(splited[0] + kvp.first);
}
}
return res;
}
void Searcher::searchContent(std::wstring& content) {
content_result.clear();
for (auto index : indexs) {
auto tmp_res = index->SearchFile(content);
std::copy(tmp_res.begin(), tmp_res.end(), std::inserter(content_result, content_result.end()));
}
}
void Searcher::filter(std::wstring& newpath) {
auto iter = path_result.begin();
while (iter != path_result.end()) {
if ((*iter)->full_path.find(newpath) == std::wstring::npos) {
iter = path_result.erase(iter);
} else {
++iter;
}
}
}
std::wstring Searcher::addHighLight(std::wstring& path) {
std::wstringstream ss;
std::wstring res;
std::priority_queue<std::pair<size_t, size_t>, std::vector<std::pair<size_t, size_t>>, std::greater<std::pair<size_t, size_t>>> PQ;
for (size_t i = 0; i <splited.size(); ++i) {
size_t loc = path.find(splited[i]);
while (loc != std::wstring::npos) {
PQ.push( std::pair<size_t, size_t>(loc, splited[i].length()));
loc = path.find(splited[i], loc + 1);
}
}
int cur = 0;
while (!PQ.empty()) {
auto top = PQ.top();
PQ.pop();
if (top.first < cur) continue;
ss << path.substr(cur, top.first - cur);
ss << L"<b>";
ss << path.substr(top.first, top.second);
ss << L"</b>";
cur = static_cast<int>(top.first + top.second);
}
ss << path.substr(cur);
return ss.str();
}
bool Searcher::singleSearch(std::wstring& path, std::wstring& query_path) {
if (query_path.size() == 0) return false;
splited = strsplit(query_path);
for (auto& word : splited) {
if (path.find(word) == std::wstring::npos) return false;
}
return true;
}
bool Searcher::update(FileEntry* entry, UpdateType type) {
if (content_result.empty() && path_result.empty()) return false;
if (type == UpdateType::ADD) {
if (singleSearch(entry->full_path, _path)) {
path_result.insert(entry);
}
return true;
}
if (type == UpdateType::REMOVE) {
auto iter = path_result.find(entry);
if (iter != path_result.end()) {
path_result.erase(iter);
}
return true;
}
if (type == UpdateType::CONTENT_CHANGE) {
return true;
}
return false;
}
bool Searcher::recvPUSN(int id, PUSN_RECORD pusn) {
auto& sub_entries = drivers[id]->sub_entries;
auto& all_entries = drivers[id]->all_entries;
auto& index = indexs[id];
auto& recycle = drivers[id]->recycle;
if (pusn->Reason == USN_REASON_RENAME_OLD_NAME) { // remove link
auto iter = all_entries.find(pusn->FileReferenceNumber);
if (iter == all_entries.end()) return false;
auto file_entry = iter->second;
auto& childs = sub_entries[pusn->ParentFileReferenceNumber];
auto iter2 = childs.begin();
while (iter2 != childs.end()) {
if ((*iter2)->file_ref == pusn->FileReferenceNumber) break;
++iter2;
}
file_entry->genPath(all_entries);
recycle[pusn->FileReferenceNumber] = file_entry;
if (index->exist(pusn->FileReferenceNumber)) index->DeleteFileIndex(file_entry->full_path);
childs.erase(iter2);
all_entries.erase(iter);
return update(file_entry, UpdateType::REMOVE);
}
if (pusn->Reason == USN_REASON_RENAME_NEW_NAME || pusn->Reason == (USN_REASON_RENAME_NEW_NAME | USN_REASON_BASIC_INFO_CHANGE)) { // add link
auto iter = recycle.find(pusn->FileReferenceNumber);
if (iter == recycle.end()) return false;
auto file_entry = iter->second;
if (sub_entries.count(pusn->ParentFileReferenceNumber) == 0) return false;
file_entry->parent_ref = pusn->ParentFileReferenceNumber;
file_entry->file_name = std::wstring(pusn->FileName).substr(0, pusn->FileNameLength / 2);
file_entry->full_path.clear();
all_entries.insert({ pusn->FileReferenceNumber, file_entry });
if (sub_entries.count(pusn->ParentFileReferenceNumber) == 0)
sub_entries.insert({ pusn->ParentFileReferenceNumber , std::vector<FileEntry*>() });
sub_entries[pusn->ParentFileReferenceNumber].push_back(file_entry);
file_entry->genPath(all_entries);
recycle.erase(iter);
if (Reader::isValid(file_entry->full_path)) index->InsertFileIndex(file_entry->file_ref, file_entry->full_path);
return update(file_entry, UpdateType::ADD);
}
if (pusn->Reason == USN_REASON_FILE_CREATE || pusn->Reason == USN_REASON_SECURITY_CHANGE) {
if (sub_entries.count(pusn->ParentFileReferenceNumber) == 0) return false;
auto ptr = new FileEntry(pusn, drivers[id]->driver_letter);
all_entries.insert({ pusn->FileReferenceNumber, ptr });
if (sub_entries.count(pusn->ParentFileReferenceNumber) == 0)
sub_entries.insert({ pusn->ParentFileReferenceNumber , std::vector<FileEntry*>() });
sub_entries[pusn->ParentFileReferenceNumber].push_back(ptr);
ptr->genPath(all_entries);
if (Reader::isValid(ptr->full_path)) index->InsertFileIndex(ptr->file_ref, ptr->full_path);
return update(ptr, UpdateType::ADD);
}
if (pusn->Reason == USN_REASON_FILE_DELETE) { // remove link
auto iter = all_entries.find(pusn->FileReferenceNumber);
if (iter == all_entries.end()) return false;
auto file_entry = iter->second;
auto& childs = sub_entries[pusn->ParentFileReferenceNumber];
auto iter2 = childs.begin();
while (iter2 != childs.end()) {
if ((*iter2)->file_ref == pusn->FileReferenceNumber) break;
++iter2;
}
file_entry->genPath(all_entries);
recycle[pusn->FileReferenceNumber] = file_entry;
if (index->exist(pusn->FileReferenceNumber)) index->DeleteFileIndex(file_entry->full_path);
childs.erase(iter2);
all_entries.erase(iter);
return update(file_entry, UpdateType::REMOVE);
}
if (pusn->Reason & (0xff | USN_REASON_OBJECT_ID_CHANGE)) {
auto iter = all_entries.find(pusn->FileReferenceNumber);
if (iter == all_entries.end()) return false;
auto file_entry = iter->second;
file_entry->genPath(drivers[id]->all_entries);
if (index->exist(file_entry->file_ref)) {
index->DeleteFileIndex(file_entry->full_path);
index->InsertFileIndex(file_entry->file_ref, file_entry->full_path);
}
return update(file_entry, UpdateType::CONTENT_CHANGE);
}
return false;
}