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/**
* Copyright 2016 (c) 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/db/pipeline/document_source_single_document_transformation.h"
#include <boost/smart_ptr/intrusive_ptr.hpp>
#include "mongo/db/pipeline/document.h"
#include "mongo/db/pipeline/document_source_limit.h"
#include "mongo/db/pipeline/document_source_skip.h"
#include "mongo/db/pipeline/expression.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
using boost::intrusive_ptr;
DocumentSourceSingleDocumentTransformation::DocumentSourceSingleDocumentTransformation(
const intrusive_ptr<ExpressionContext>& pExpCtx,
std::unique_ptr<TransformerInterface> parsedTransform,
std::string name,
bool isIndependentOfAnyCollection)
: DocumentSource(pExpCtx),
_parsedTransform(std::move(parsedTransform)),
_name(std::move(name)),
_isIndependentOfAnyCollection(isIndependentOfAnyCollection) {}
const char* DocumentSourceSingleDocumentTransformation::getSourceName() const {
return _name.c_str();
}
DocumentSource::GetNextResult DocumentSourceSingleDocumentTransformation::getNext() {
pExpCtx->checkForInterrupt();
// Get the next input document.
auto input = pSource->getNext();
if (!input.isAdvanced()) {
return input;
}
// Apply and return the document with added fields.
return _parsedTransform->applyTransformation(input.releaseDocument());
}
intrusive_ptr<DocumentSource> DocumentSourceSingleDocumentTransformation::optimize() {
_parsedTransform->optimize();
return this;
}
void DocumentSourceSingleDocumentTransformation::doDispose() {
if (_parsedTransform) {
// Cache the stage options document in case this stage is serialized after disposing.
_cachedStageOptions = _parsedTransform->serializeTransformation(pExpCtx->explain);
_parsedTransform.reset();
}
}
Value DocumentSourceSingleDocumentTransformation::serialize(
boost::optional<ExplainOptions::Verbosity> explain) const {
return Value(Document{{getSourceName(),
_parsedTransform ? _parsedTransform->serializeTransformation(explain)
: _cachedStageOptions}});
}
Pipeline::SourceContainer::iterator DocumentSourceSingleDocumentTransformation::doOptimizeAt(
Pipeline::SourceContainer::iterator itr, Pipeline::SourceContainer* container) {
invariant(*itr == this);
auto nextSkip = dynamic_cast<DocumentSourceSkip*>((*std::next(itr)).get());
if (nextSkip) {
std::swap(*itr, *std::next(itr));
return itr == container->begin() ? itr : std::prev(itr);
}
return std::next(itr);
}
DepsTracker::State DocumentSourceSingleDocumentTransformation::getDependencies(
DepsTracker* deps) const {
// Each parsed transformation is responsible for adding its own dependencies, and returning
// the correct dependency return type for that transformation.
return _parsedTransform->addDependencies(deps);
}
DocumentSource::GetModPathsReturn DocumentSourceSingleDocumentTransformation::getModifiedPaths()
const {
return _parsedTransform->getModifiedPaths();
}
} // namespace mongo
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