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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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/db/pipeline/document_source_densify.h"
#include "mongo/util/visit_helper.h"
namespace mongo {
namespace document_source_densify {
// TODO SERVER-57334 Translation logic goes here.
} // namespace document_source_densify
DocumentSourceInternalDensify::DocGenerator::DocGenerator(
DocumentSourceInternalDensify::DensifyValueType min,
DocumentSourceInternalDensify::DensifyValueType max,
StepSpec step,
FieldPath fieldName,
Document includeFields,
boost::optional<Document> finalDoc)
: _step(std::move(step)),
_path(std::move(fieldName.fullPath())),
_includeFields(std::move(includeFields)),
_finalDoc(std::move(finalDoc)),
_min(std::move(min)),
_max(std::move(max)) {
tassert(5733306,
"DocGenerator cannot include field that is being densified",
_includeFields.getNestedField(_path).missing());
// Traverse the preserved fields document to make sure we're not going through an array.
auto traverseDoc = _includeFields;
auto pathLength = _path.getPathLength();
for (size_t i = 0; i < pathLength; ++i) {
auto curVal = traverseDoc.getField(_path.getFieldName(i));
uassert(5733307, "$densify cannot generate fields nested inside arrays", !curVal.isArray());
if (curVal.isObject()) {
traverseDoc = curVal.getDocument();
} else {
// Can't write to a field that has a non-object value as a path-prefix, as that would
// overwrite data. We should only have a non-object at the end of the path.
uassert(5733308,
"$densify cannot overwrite non-object values with objects",
i == pathLength - 1 || curVal.missing());
break;
}
}
tassert(5733305, "DocGenerator step must be positive", _step.step > 0);
stdx::visit(
visit_helper::Overloaded{
[&](const double doubleMin) {
tassert(5733304,
"DocGenerator all values must be same type",
stdx::holds_alternative<double>(_max));
tassert(5733303,
"DocGenerator min must be lower or equal to max",
stdx::get<double>(_max) >= doubleMin);
tassert(5733506,
"Unit and tz must not be specified with non-date values",
!_step.unit && !_step.tz);
},
[&](const Date_t dateMin) {
tassert(5733500,
"DocGenerator all values must be same type",
stdx::holds_alternative<Date_t>(_max));
tassert(5733501, "Unit must be specified with a date step", _step.unit);
tassert(5733505,
"Step must be an integer for date densification",
floor(_step.step) == _step.step);
tassert(5733502,
"DocGenerator min must be lower or equal to max",
stdx::get<Date_t>(_max) >= dateMin);
tassert(5733504, "DocGenerator with dates requires a time zone", _step.tz);
},
},
_min);
}
Document DocumentSourceInternalDensify::DocGenerator::getNextDocument() {
tassert(5733301,
"Called DocGenerator::getNextDocument() but generator is done",
_state != GeneratorState::kDone);
if (_state == GeneratorState::kReturningFinalDocument) {
_state = GeneratorState::kDone;
// If _finalDoc is boost::none we can't be in this state.
tassert(5832800, "DocGenerator expected _finalDoc, found boost::none", _finalDoc);
return _finalDoc.get();
}
// Assume all types have been checked at this point and we are in a valid state.
Value valueToAdd;
stdx::visit(
visit_helper::Overloaded{
[&](double doubleVal) {
valueToAdd = Value(doubleVal);
doubleVal += _step.step;
if (doubleVal > stdx::get<double>(_max)) {
_state =
_finalDoc ? GeneratorState::kReturningFinalDocument : GeneratorState::kDone;
}
_min = doubleVal;
},
[&](Date_t dateVal) {
valueToAdd = Value(dateVal);
dateVal = dateAdd(dateVal, _step.unit.get(), _step.step, _step.tz.get());
if (dateVal > stdx::get<Date_t>(_max)) {
_state =
_finalDoc ? GeneratorState::kReturningFinalDocument : GeneratorState::kDone;
}
_min = dateVal;
},
},
_min);
MutableDocument retDoc(_includeFields);
retDoc.setNestedField(_path, valueToAdd);
return retDoc.freeze();
}
bool DocumentSourceInternalDensify::DocGenerator::done() const {
return _state == GeneratorState::kDone;
}
DocumentSource::GetNextResult DocumentSourceInternalDensify::doGetNext() {
return pSource->getNext();
}
} // namespace mongo
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