src/XMLCommand.h
author František Kučera <franta-hg@frantovo.cz>
Fri, 11 Jan 2019 01:13:40 +0100
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generate random relation on SAX events
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/**
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 * Relational pipes
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 * Copyright © 2018 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, either version 3 of the License, or
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 * (at your option) any later version.
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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 <cstdlib>
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#include <iostream>
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#include <string>
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#include <vector>
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#include <algorithm>
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#include <xercesc/sax2/SAX2XMLReader.hpp>
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#include <xercesc/sax2/XMLReaderFactory.hpp>
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#include <xercesc/sax2/DefaultHandler.hpp>
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#include <xercesc/util/XMLString.hpp>
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#include <relpipe/writer/typedefs.h>
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#include "StreamInputSource.h"
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namespace relpipe {
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namespace in {
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namespace xml {
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using namespace relpipe::writer;
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using namespace xercesc;
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class XMLCommand {
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private:
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	class RelpipeSaxHandler : public xercesc::DefaultHandler {
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	private:
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		unique_ptr<RelationalWriter> writer;
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	public:
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		RelpipeSaxHandler(std::ostream& output) : DefaultHandler(), writer(Factory::create(output)) {
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		}
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		void startElement(const XMLCh * const uri, const XMLCh * const localname, const XMLCh * const qname, const Attributes& attrs) override {
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			//XMLString::
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			// TODO: remove demo
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			writer->startRelation(L"xml_startElement",{
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				{L"s", TypeId::STRING},
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			}, true);
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			writer->writeAttribute(L"a");
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		}
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		void endElement(const XMLCh * const uri, const XMLCh * const localname, const XMLCh * const qname) override {
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			// TODO: remove demo
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			writer->startRelation(L"xml_endElement",{
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				{L"s", TypeId::STRING},
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			}, true);
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			writer->writeAttribute(L"a");
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		}
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		void endDocument() override {
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			// TODO: remove demo
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			writer->startRelation(L"xml_endDocument",{
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				{L"s", TypeId::STRING},
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			}, true);
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			writer->writeAttribute(L"a");
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		}
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	};
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public:
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	void process(std::istream& input, std::ostream& output) {
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		XMLPlatformUtils::Initialize();
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		unique_ptr<SAX2XMLReader> parser(XMLReaderFactory::createXMLReader());
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		parser->setFeature(XMLUni::fgSAX2CoreValidation, true);
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		parser->setFeature(XMLUni::fgSAX2CoreNameSpaces, true);
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		RelpipeSaxHandler saxHandler(output);
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		parser->setContentHandler(&saxHandler);
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		parser->setErrorHandler(&saxHandler);
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		StreamInputSource inputSource(input);
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		parser->parse(inputSource);
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	}
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};
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}
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}
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}