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vfs_vector: avoid n^2 lookup in layeredfs building

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This commit is contained in:
Liam 2023-05-07 01:19:13 -04:00
parent 0c5bdc7241
commit 5792a72c29
2 changed files with 23 additions and 0 deletions
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19
src/core/file_sys/vfs_vector.cpp
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@ -67,6 +67,23 @@ VectorVfsDirectory::VectorVfsDirectory(std::vector<VirtualFile> files_,
VectorVfsDirectory::~VectorVfsDirectory() = default;
VirtualFile VectorVfsDirectory::GetFile(std::string_view file_name) const {
if (!optimized_file_index_built) {
optimized_file_index.clear();
for (size_t i = 0; i < files.size(); i++) {
optimized_file_index.emplace(files[i]->GetName(), i);
}
optimized_file_index_built = true;
}
const auto it = optimized_file_index.find(file_name);
if (it != optimized_file_index.end()) {
return files[it->second];
}
return nullptr;
}
std::vector<VirtualFile> VectorVfsDirectory::GetFiles() const {
return files;
}
@ -107,6 +124,7 @@ bool VectorVfsDirectory::DeleteSubdirectory(std::string_view subdir_name) {
}
bool VectorVfsDirectory::DeleteFile(std::string_view file_name) {
optimized_file_index_built = false;
return FindAndRemoveVectorElement(files, file_name);
}
@ -124,6 +142,7 @@ VirtualFile VectorVfsDirectory::CreateFile(std::string_view file_name) {
}
void VectorVfsDirectory::AddFile(VirtualFile file) {
optimized_file_index_built = false;
files.push_back(std::move(file));
}

4
src/core/file_sys/vfs_vector.h
View file

@ -105,6 +105,7 @@ public:
VirtualDir parent = nullptr);
~VectorVfsDirectory() override;
VirtualFile GetFile(std::string_view file_name) const override;
std::vector<VirtualFile> GetFiles() const override;
std::vector<VirtualDir> GetSubdirectories() const override;
bool IsWritable() const override;
@ -126,6 +127,9 @@ private:
VirtualDir parent;
std::string name;
mutable std::map<std::string, size_t, std::less<>> optimized_file_index;
mutable bool optimized_file_index_built{};
};
} // namespace FileSys