/**
* Relational pipes
* Copyright © 2020 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 <codecvt>
#include <regex>
#include <relpipe/common/type/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"
namespace relpipe {
namespace tr {
namespace xpath {
class XPathHandler : public relpipe::reader::handlers::RelationalReaderStringHandler {
private:
shared_ptr<relpipe::writer::RelationalWriter> relationalWriter;
Configuration configuration;
RelationConfiguration* currentRelationConfiguration;
std::vector<relpipe::reader::handlers::AttributeMetadata> currentReaderMetadata;
std::vector<relpipe::writer::AttributeMetadata> currentWriterMetadata;
size_t currentAttributeIndex = 0;
void copyInputAttributesToOutput() {
for (auto rm : currentReaderMetadata) currentWriterMetadata.push_back({rm.getAttributeName(), relationalWriter->toTypeId(rm.getTypeName())});
}
bool isPrependingInputAttributes() {
return currentRelationConfiguration->inputAttributePolicy == InputAttributePolicy::Prepend
|| (currentRelationConfiguration->inputAttributePolicy == InputAttributePolicy::Auto && currentRelationConfiguration->outputAttributes.size() == 0);
}
bool isAppendingInputAttributes() {
return currentRelationConfiguration->inputAttributePolicy == InputAttributePolicy::Append;
}
public:
XPathHandler(shared_ptr<relpipe::writer::RelationalWriter> relationalWriter, Configuration configuration) : relationalWriter(relationalWriter), configuration(configuration) {
}
virtual ~XPathHandler() {
}
void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override {
currentRelationConfiguration = nullptr;
for (int i = 0; i < configuration.relationConfigurations.size(); i++) {
if (std::regex_match(name, std::wregex(configuration.relationConfigurations[i].relation))) {
currentRelationConfiguration = &configuration.relationConfigurations[i];
break;
}
}
currentReaderMetadata = attributes;
currentWriterMetadata.clear();
if (currentRelationConfiguration == nullptr) {
copyInputAttributesToOutput();
} else {
if (isPrependingInputAttributes()) copyInputAttributesToOutput();
for (auto oa : currentRelationConfiguration->outputAttributes) currentWriterMetadata.push_back({oa.name, oa.type});
if (isAppendingInputAttributes()) copyInputAttributesToOutput();
// TODO: prepare DOM
}
relationalWriter->startRelation(name, currentWriterMetadata, true);
}
void attribute(const relpipe::common::type::StringX& value) override {
if (currentRelationConfiguration) {
relpipe::reader::handlers::AttributeMetadata attributeMetadata = currentReaderMetadata[currentAttributeIndex];
// TODO: add attribute to DOM
currentAttributeIndex++;
if (currentAttributeIndex == currentReaderMetadata.size()) {
// TODO: evaluate XPath expression
// TODO: write record to output, if the XPath condition was met
// TODO: clean record node in DOM
currentAttributeIndex = 0;
}
} else {
relationalWriter->writeAttribute(value);
}
}
void endOfPipe() {
}
};
}
}
}