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* Copyright (c) 2011 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
* 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 <>.
* 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/pipeline/field_path.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
using std::ostream;
using std::string;
using std::stringstream;
using std::vector;
using namespace mongoutils;
const char FieldPath::prefix[] = "$";
FieldPath::FieldPath(const vector<string>& fieldPath) {
massert(16409, "FieldPath cannot be constructed from an empty vector.", !fieldPath.empty());
for(vector<string>::const_iterator i = fieldPath.begin(); i != fieldPath.end(); ++i) {
verify(getPathLength() > 0);
FieldPath::FieldPath(const string& fieldPath) {
The field path could be using dot notation.
Break the field path up by peeling off successive pieces.
size_t startpos = 0;
while(true) {
/* find the next dot */
const size_t dotpos = fieldPath.find('.', startpos);
/* if there are no more dots, use the remainder of the string */
if (dotpos == fieldPath.npos) {
string lastFieldName = fieldPath.substr(startpos, dotpos);
/* use the string up to the dot */
const size_t length = dotpos - startpos;
string nextFieldName = fieldPath.substr(startpos, length);
/* next time, search starting one spot after that */
startpos = dotpos + 1;
verify(getPathLength() > 0);
string FieldPath::getPath(bool fieldPrefix) const {
stringstream ss;
writePath(ss, fieldPrefix);
return ss.str();
void FieldPath::writePath(ostream &outStream, bool fieldPrefix) const {
if (fieldPrefix)
outStream << prefix;
const size_t n = vFieldName.size();
verify(n > 0);
outStream << vFieldName[0];
for(size_t i = 1; i < n; ++i)
outStream << '.' << vFieldName[i];
FieldPath FieldPath::tail() const {
vector<string> allButFirst(vFieldName.begin()+1, vFieldName.end());
return FieldPath(allButFirst);
void FieldPath::uassertValidFieldName(const string& fieldName) {
uassert(15998, "FieldPath field names may not be empty strings.", fieldName.length() > 0);
uassert(16410, "FieldPath field names may not start with '$'.", fieldName[0] != '$');
uassert(16411, "FieldPath field names may not contain '\0'.",
fieldName.find('\0') == string::npos);
uassert(16412, "FieldPath field names may not contain '.'.",
!str::contains(fieldName, '.'));
void FieldPath::pushFieldName(const string& fieldName) {
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