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/**
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* Relational pipes
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* Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <memory>
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#include <string>
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#include <vector>
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#include <iostream>
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#include <sstream>
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#include <locale>
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#include <codecvt>
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#include <stdexcept>
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#include <relpipe/reader/typedefs.h>
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#include <relpipe/reader/TypeId.h>
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#include <relpipe/reader/handlers/RelationalReaderStringHandler.h>
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#include <relpipe/reader/handlers/AttributeMetadata.h>
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#include "Configuration.h"
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namespace relpipe {
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namespace out {
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namespace x11 {
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using namespace relpipe;
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using namespace relpipe::reader;
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using namespace relpipe::reader::handlers;
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class X11Handler : public RelationalReaderStringHandler {
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private:
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std::ostream& output;
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Configuration& configuration;
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const char QUOTE = '"';
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std::wstring_convert<std::codecvt_utf8<wchar_t>> convertor; // TODO: probably not needed
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std::vector<AttributeMetadata> firstAttributes;
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integer_t valueCount = 0;
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public:
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X11Handler(std::ostream& output, Configuration& configuration) : output(output), configuration(configuration) {
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}
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void startRelation(string_t name, std::vector<AttributeMetadata> attributes) override {
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if (firstAttributes.empty()) {
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firstAttributes = attributes;
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if (configuration.writeHeader) for (auto attr : attributes) attribute(attr.getAttributeName());
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} else {
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throw std::logic_error("Only a single relation can be converted to the X11 format.");
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}
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}
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void attribute(const string_t& value) override {
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valueCount++;
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if (value.size() > 0) {
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output << QUOTE;
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for (auto ch : convertor.to_bytes(value)) {
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if (ch == QUOTE) output << QUOTE << QUOTE;
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else output << ch;
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}
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output << QUOTE;
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}
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if (valueCount % firstAttributes.size()) {
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output << ",";
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} else {
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output << "\r\n";
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valueCount = 0;
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}
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}
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void endOfPipe() {
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output.flush();
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}
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};
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}
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}
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}
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