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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 {
ModifierNode::ModifyResult ArrayCullingNode::updateExistingElement(
mutablebson::Element* element, std::shared_ptr<FieldRef> elementPath) const {
invariant(element->ok());
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)) {
invariant(cursor.remove());
numRemoved++;
}
cursor = nextElement;
}
return (numRemoved == 0) ? ModifyResult::kNoOp : ModifyResult::kNormalUpdate;
}
void ArrayCullingNode::validateUpdate(mutablebson::ConstElement updatedElement,
mutablebson::ConstElement leftSibling,
mutablebson::ConstElement rightSibling,
std::uint32_t recursionLevel,
ModifyResult modifyResult) const {
invariant(modifyResult == ModifyResult::kNormalUpdate);
// Removing elements from an array cannot increase BSON depth or modify a DBRef, so we can
// override validateUpdate to do nothing.
}
} // namespace mongo
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