/**
* Relational pipes
* Copyright © 2021 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 <memory>
#include <string>
#include <vector>
#include <iostream>
#include <sstream>
#include <locale>
#include <codecvt>
#include <regex>
#include <stdexcept>
#include <relpipe/reader/typedefs.h>
#include <relpipe/reader/TypeId.h>
#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
#include <relpipe/reader/handlers/AttributeMetadata.h>
#include <relpipe/writer/Factory.h>
#include <relpipe/cli/RelpipeCLIException.h>
#include "Configuration.h"
#include "Mode.h"
#include "DataMode.h"
#include "MetadataMode.h"
namespace relpipe {
namespace tr {
namespace infertypes {
using namespace std;
using namespace relpipe;
using namespace relpipe::reader;
using namespace relpipe::reader::handlers;
class InferTypesHandler : public RelationalReaderStringHandler {
private:
shared_ptr<writer::RelationalWriter> relationalWriter;
Configuration configuration;
std::shared_ptr<Mode> currentMode;
vector<writer::AttributeMetadata> toWriterMetadata(vector<AttributeMetadata> attributes) {
// TODO: move to a reusable method (or use same metadata on both reader and writer side?)
vector<writer::AttributeMetadata> writerMetadata;
for (AttributeMetadata readerMetadata : attributes) {
writerMetadata.push_back({readerMetadata.getAttributeName(), relationalWriter->toTypeId(readerMetadata.getTypeName())});
}
return writerMetadata;
}
public:
InferTypesHandler(shared_ptr<writer::RelationalWriter> relationalWriter, Configuration configuration) : relationalWriter(relationalWriter), configuration(configuration) {
}
void startRelation(string_t name, vector<AttributeMetadata> attributes) override {
// TODO: move this logic to relpipe-lib-infertypes and share with certain modules like relpipe-in-csv
for (RelationConfiguration rc : configuration.relationConfigurations) {
if (std::regex_match(name, rc.relationPattern)) {
if (rc.mode == MODE::METADATA || rc.mode == MODE::AUTO && MetadataMode::willInfer(attributes)) currentMode.reset(new MetadataMode(relationalWriter));
else if (rc.mode == MODE::DATA) currentMode.reset(new DataMode(relationalWriter));
else throw std::logic_error("Unsupported mode: " + std::to_string((int) rc.mode));
break;
}
}
if (currentMode) currentMode->startRelation(name, attributes);
else relationalWriter->startRelation(name, toWriterMetadata(attributes), true);
}
void attribute(const string_t& value) override {
if (currentMode) currentMode->attribute(value);
else relationalWriter->writeAttribute(value);
}
void endOfPipe() {
currentMode.reset();
}
};
}
}
}