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Optimise duplicate checking and sorting in FileLister::browse

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Using a std::set makes both duplicate checking and sorting run in
O(n log n).
This commit is contained in:
Nebuleon Fumika 2014-08-13 01:54:12 +00:00 committed by Maarten ter Huurne
parent bd7eac32ba
commit f1e92425ac
1 changed files with 13 additions and 15 deletions
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28
src/filelister.cpp
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@ -31,6 +31,7 @@
#include <iostream>
#include <algorithm>
#include <cstring>
#include <set>
using namespace std;
@ -61,9 +62,11 @@ void FileLister::setShowFiles(bool showFiles)
void FileLister::browse(const string& path, bool clean)
{
if (clean) {
directories.clear();
files.clear();
set<string, case_less> directorySet;
set<string, case_less> fileSet;
if (!clean) {
directorySet.insert(directories.begin(), directories.end());
fileSet.insert(files.begin(), files.end());
}
if (showDirectories || showFiles) {
@ -100,19 +103,13 @@ void FileLister::browse(const string& path, bool clean)
if (!showDirectories)
continue;
if (std::find(directories.begin(), directories.end(), file) != directories.end())
continue;
directories.push_back(file);
directorySet.insert(file);
} else {
if (!showFiles)
continue;
if (std::find(files.begin(), files.end(), file) != files.end())
continue;
if (filter.empty()) {
files.push_back(file);
fileSet.insert(file);
continue;
}
@ -121,7 +118,7 @@ void FileLister::browse(const string& path, bool clean)
if (!it->empty())
continue;
files.push_back(file);
fileSet.insert(file);
break;
}
@ -138,7 +135,7 @@ void FileLister::browse(const string& path, bool clean)
file_lowercase.begin(), ::tolower);
if (file_lowercase.compare(0, it->length(), *it) == 0) {
files.push_back(file);
fileSet.insert(file);
break;
}
}
@ -147,9 +144,10 @@ void FileLister::browse(const string& path, bool clean)
}
closedir(dirp);
sort(files.begin(), files.end(), case_less());
sort(directories.begin(), directories.end(), case_less());
}
directories = vector<string>(directorySet.begin(), directorySet.end());
files = vector<string>(fileSet.begin(), fileSet.end());
}
unsigned int FileLister::size()