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