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/**
* Copyright (C) 2017 MongoDB 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/update/array_culling_node.h"
namespace mongo {
void ArrayCullingNode::apply(mutablebson::Element element,
FieldRef* pathToCreate,
FieldRef* pathTaken,
StringData matchedField,
bool fromReplication,
bool validateForStorage,
const FieldRefSet& immutablePaths,
const UpdateIndexData* indexData,
LogBuilder* logBuilder,
bool* indexesAffected,
bool* noop) const {
*indexesAffected = false;
*noop = false;
if (!pathToCreate->empty()) {
// There were path components we could not traverse. We treat this as a no-op, unless it
// would have been impossible to create those elements, which we check with
// checkViability().
UpdateLeafNode::checkViability(element, *pathToCreate, *pathTaken);
*noop = true;
return;
}
// This operation only applies to arrays
uassert(ErrorCodes::BadValue,
"Cannot apply $pull to a non-array value",
element.getType() == mongo::Array);
size_t numRemoved = 0;
auto cursor = element.leftChild();
while (cursor.ok()) {
// Make sure to get the next array element now, because if we remove the 'cursor' element,
// the rightSibling pointer will be invalidated.
auto nextElement = cursor.rightSibling();
if (_matcher->match(cursor)) {
invariantOK(cursor.remove());
numRemoved++;
}
cursor = nextElement;
}
if (numRemoved == 0) {
*noop = true;
return; // Skip the index check, immutable path check, and logging steps.
}
// Determine if indexes are affected.
if (indexData && indexData->mightBeIndexed(pathTaken->dottedField())) {
*indexesAffected = true;
}
// No need to validate for storage, since we cannot have increased the BSON depth or interfered
// with a DBRef.
// Ensure we are not changing any immutable paths.
for (const auto& immutablePath : immutablePaths) {
uassert(ErrorCodes::ImmutableField,
str::stream() << "Performing an update on the path '" << pathTaken->dottedField()
<< "' would modify the immutable field '"
<< immutablePath->dottedField()
<< "'",
pathTaken->commonPrefixSize(*immutablePath) <
std::min(pathTaken->numParts(), immutablePath->numParts()));
}
if (logBuilder) {
auto& doc = logBuilder->getDocument();
auto logElement = doc.makeElementArray(pathTaken->dottedField());
for (auto cursor = element.leftChild(); cursor.ok(); cursor = cursor.rightSibling()) {
dassert(cursor.hasValue());
auto copy = doc.makeElementWithNewFieldName(StringData(), cursor.getValue());
uassert(ErrorCodes::InternalError, "could not create copy element", copy.ok());
uassertStatusOK(logElement.pushBack(copy));
}
uassertStatusOK(logBuilder->addToSets(logElement));
}
}
} // namespace mongo
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