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/**
* Copyright (C) 2018-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/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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