/**
* Relational pipes
* Copyright © 2019 František Kučera (Frantovo.cz, GlobalCode.info)
*
* 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, version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "FilesystemCommandBase.h"
namespace relpipe {
namespace in {
namespace filesystem {
namespace fs = std::filesystem;
using namespace relpipe::writer;
class FilesystemCommand : public FilesystemCommandBase {
private:
std::map<string_t, std::shared_ptr<AttributeFinder>> attributeFinders = createAttributeFinders();
public:
void process(std::istream& input, std::ostream& output, Configuration& configuration) {
std::shared_ptr<RelationalWriter> writer(Factory::create(output));
string_t relationName = configuration.relation.empty() ? L"filesystem" : configuration.relation;
std::vector<AttributeMetadata> attributesMetadata;
for (RequestedField field : configuration.fields) {
std::shared_ptr<AttributeFinder> finder = attributeFinders[field.group];
if (finder) for (AttributeMetadata m : finder->toMetadata(writer.get(), relationName, field)) attributesMetadata.push_back(m);
else throw RelpipeWriterException(L"Unsupported field group: " + field.group);
}
writer->startRelation(relationName, attributesMetadata, true);
for (std::stringstream originalName; readNext(input, originalName); reset(originalName)) {
fs::path file(originalName.str().empty() ? "." : originalName.str()); // interpret empty string as current directory (e.g. result of: find -printf '%P\0')
bool exists = false;
try {
exists = fs::exists(file);
} catch (const fs::filesystem_error& e) {
// we probably do not have permissions to given directory → pretend that the file does not exist
}
for (auto& finder : attributeFinders) finder.second->startFile(file, originalName.str(), exists);
for (RequestedField field : configuration.fields) {
std::shared_ptr<AttributeFinder> finder = attributeFinders[field.group]; // should not be nullptr, because already checked while writing the relation metadata
finder->writeField(writer.get(), relationName, field);
}
for (auto& finder : attributeFinders) finder.second->endFile();
}
}
};
}
}
}