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/**
* Copyright (C) 2013 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/db/update/field_checker.h"
#include "mongo/base/error_codes.h"
#include "mongo/db/field_ref.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using mongoutils::str::stream;
namespace fieldchecker {
Status isUpdatable(const FieldRef& field) {
const size_t numParts = field.numParts();
if (numParts == 0) {
return Status(ErrorCodes::EmptyFieldName, "An empty update path is not valid.");
}
for (size_t i = 0; i != numParts; ++i) {
const StringData part = field.getPart(i);
if (part.empty()) {
return Status(ErrorCodes::EmptyFieldName,
mongoutils::str::stream()
<< "The update path '"
<< field.dottedField()
<< "' contains an empty field name, which is not allowed.");
}
}
return Status::OK();
}
bool isPositionalElement(const StringData& field) {
return field.size() == 1 && field[0] == '$';
}
bool isPositional(const FieldRef& fieldRef, size_t* pos, size_t* count) {
// 'count' is optional.
size_t dummy;
if (count == NULL) {
count = &dummy;
}
*count = 0;
size_t size = fieldRef.numParts();
for (size_t i = 0; i < size; i++) {
StringData fieldPart = fieldRef.getPart(i);
if (isPositionalElement(fieldPart)) {
if (*count == 0)
*pos = i;
(*count)++;
}
}
return *count > 0;
}
bool isArrayFilterIdentifier(const StringData& field) {
return field.size() >= 3 && field[0] == '$' && field[1] == '[' &&
field[field.size() - 1] == ']';
}
bool hasArrayFilter(const FieldRef& fieldRef) {
auto size = fieldRef.numParts();
for (size_t i = 0; i < size; i++) {
auto fieldPart = fieldRef.getPart(i);
if (isArrayFilterIdentifier(fieldPart)) {
return true;
}
}
return false;
}
} // namespace fieldchecker
} // namespace mongo
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