src/RelpipeASN1ContentHandler.h
author František Kučera <franta-hg@frantovo.cz>
Mon, 26 Jul 2021 21:25:48 +0200
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RelpipeASN1ContentHandler: first version that parses a single relation
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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 <relpipe/writer/RelationalWriter.h>
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#include <relpipe/writer/RelpipeWriterException.h>
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#include "lib/ASN1ContentHandler.h"
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#include "Configuration.h"
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namespace relpipe {
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namespace in {
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namespace asn1 {
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class RelpipeASN1ContentHandler : public lib::ASN1ContentHandler {
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private:
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	wstring_convert < codecvt_utf8<wchar_t>> convertor; // ASN.1 parser works with UTF-8
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	std::shared_ptr<relpipe::writer::RelationalWriter> writer;
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	Configuration configuration;
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	relpipe::common::type::StringX currentRelationName;
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	std::vector<relpipe::writer::AttributeMetadata> currentAttributes;
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	enum class State {
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		Start,
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		Relation,
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		RelationName,
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		Header,
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		HeaderItem,
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		AttributeName,
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		AttributeType,
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		Records,
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		Record,
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		Attribute,
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	};
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	State state = State::Start;
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	void assertTag(const Header& header, uint64_t expectedTag, TagClass expectedClass = TagClass::Universal) {
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		if (header.tagClass != expectedClass || header.tag != expectedTag) throw relpipe::writer::RelpipeWriterException(L"Unexpected tag."); // TODO: add actual vs. expected values
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	}
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public:
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	RelpipeASN1ContentHandler(std::shared_ptr<relpipe::writer::RelationalWriter> writer, Configuration configuration) : writer(writer), configuration(configuration) {
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	}
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	bool setOption(const std::string& uri, const std::string& value) override {
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		return false;
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	}
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	void writeStreamStart() override {
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	}
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	void writeStreamEnd() override {
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	}
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	void writeCollectionStart(const Header& header) override {
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		assertTag(header, lib::UniversalType::Sequence);
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		if (state == State::Start) state = State::Relation;
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		else if (state == State::Relation) state = State::RelationName;
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		else if (state == State::Header) state = State::HeaderItem;
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		else if (state == State::HeaderItem) state = State::AttributeName;
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		else if (state == State::Records) state = State::Record;
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		else std::wcerr << L"writeCollectionStart(): state=" << (int) state << std::endl; // TODO: remove
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	}
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	void writeCollectionEnd() override {
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		if (state == State::Header) state = State::Records;
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		else if (state == State::AttributeType) state = State::HeaderItem;
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		else if (state == State::HeaderItem) state = State::Records;
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		else if (state == State::Records) state = State::Relation;
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		else if (state == State::Record) state = State::Record;
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		else std::wcerr << L"writeCollectionEnd(): state=" << (int) state << std::endl; // TODO: remove
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		if (state == State::Records) {
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			writer->startRelation(currentRelationName, currentAttributes, true);
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			currentRelationName = L"";
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			currentAttributes.clear();
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		}
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	}
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	void writeBitString(const Header& header, std::vector<bool> value) override {
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	}
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	void writeBoolean(const Header& header, bool value) override {
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		if (state == State::Record) writer->writeAttribute(&value, typeid (value));
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	}
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	void writeDateTime(const Header& header, DateTime value) override {
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	}
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	void writeInteger(const Header& header, Integer value) override {
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		relpipe::common::type::Integer integer = value.toInt64();
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		if (state == State::Record) writer->writeAttribute(&integer, typeid (integer));
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	}
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	void writeNull(const Header& header) override {
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	}
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	void writeOID(const Header& header, ObjectIdentifier value) override {
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	}
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	void writeOctetString(const Header& header, std::string value) override {
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	}
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	void writeTextString(const Header& header, std::string value) override {
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		assertTag(header, lib::UniversalType::UTF8String);
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		relpipe::common::type::StringX str = convertor.from_bytes(value);
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		if (state == State::RelationName) {
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			currentRelationName = convertor.from_bytes(value);
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			state = State::Header;
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		} else if (state == State::AttributeName) {
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			currentAttributes.push_back({str, relpipe::writer::TypeId::STRING});
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			state = State::AttributeType;
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		} else if (state == State::AttributeType) {
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			currentAttributes.back().typeId = writer->toTypeId(str);
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		} else if (state == State::Record) {
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			writer->writeAttribute(&str, typeid (str));
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		} else std::wcerr << L"writeTextString(): state=" << (int) state << std::endl; // TODO: remove
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	}
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	void writeSpecific(const Header& header, std::string value) override {
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	}
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};
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}
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}
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}