/**
* 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 <string>
#include <stdexcept>
#include "ASN1ContentHandler.h"
namespace relpipe {
namespace in {
namespace asn1 {
namespace lib {
/**
* Does not generate any output but enforces certain rules (related to stream and collection start/end).
* When invalid behavior occurs, an exception is thrown.
*
*/
class ValidatingASN1ContentHandler : public ASN1ContentHandler {
private:
bool streamOpened = false;
bool streamClosed = false;
size_t collectionLevel = 0;
public:
virtual void writeStreamStart() {
if (streamOpened) throw std::logic_error("ValidatingASN1ContentHandler: tried to open the stream twice"); // TODO: better exception
if (streamClosed) throw std::logic_error("ValidatingASN1ContentHandler: tried to open the stream that was already closed"); // TODO: better exception
streamOpened = true;
}
virtual void writeStreamEnd() {
if (streamClosed) throw std::logic_error("ValidatingASN1ContentHandler: tried to close the stream twice"); // TODO: better exception
if (!streamOpened) throw std::logic_error("ValidatingASN1ContentHandler: tried to close a stream that was already closed or never opened"); // TODO: better exception
if (collectionLevel != 0) throw std::logic_error("ValidatingASN1ContentHandler: not all opened collections was closed – remaining: " + std::to_string(collectionLevel)); // TODO: better exception
streamClosed = true;
}
virtual void writeCollectionStart(const Header& header) {
if (!streamOpened) throw std::logic_error("ValidatingASN1ContentHandler: tried to open a collection while the stream was not opened"); // TODO: better exception
if (streamClosed) throw std::logic_error("ValidatingASN1ContentHandler: tried to open a collection while the stream was already closed"); // TODO: better exception
collectionLevel++;
}
virtual void writeCollectionEnd() {
if (streamClosed) throw std::logic_error("ValidatingASN1ContentHandler: tried to close a collection while the stream was already closed"); // TODO: better exception
if (collectionLevel == 0) throw std::logic_error("ValidatingASN1ContentHandler: tried to close a collection while none was opened"); // TODO: better exception
collectionLevel--;
}
virtual void finalCheck() {
if (!streamOpened) throw std::logic_error("ValidatingASN1ContentHandler: the stream was not opened at all"); // TODO: better exception
if (!streamClosed) throw std::logic_error("ValidatingASN1ContentHandler: the stream was opened but not closed"); // TODO: better exception
}
// These events are intentionally ignored:
void writeBitString(const Header& header, std::vector<bool> value) override {
}
void writeBoolean(const Header& header, bool value) override {
}
void writeDateTime(const Header& header, DateTime value) override {
}
void writeInteger(const Header& header, Integer value) override {
}
void writeNull(const Header& header) override {
}
void writeOID(const Header& header, ObjectIdentifier value) override {
}
void writeOctetString(const Header& header, std::string value) override {
}
void writeTextString(const Header& header, std::string value) override {
}
void writeSpecific(const Header& header, std::string value) override {
}
};
}
}
}
}