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/**
* Copyright (C) 2015 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/query/count_request.h"
#include "mongo/db/namespace_string.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace {
const char kCmdName[] = "count";
const char kQueryField[] = "query";
const char kLimitField[] = "limit";
const char kSkipField[] = "skip";
const char kHintField[] = "hint";
} // namespace
CountRequest::CountRequest(const std::string& fullNs, BSONObj query)
: _fullNs(fullNs),
_query(query.getOwned()) {
}
void CountRequest::setHint(BSONObj hint) {
_hint = hint.getOwned();
}
BSONObj CountRequest::toBSON() const {
BSONObjBuilder builder;
builder.append(kCmdName, _fullNs);
builder.append(kQueryField, _query);
if (_limit) {
builder.append(kLimitField, _limit.get());
}
if (_skip) {
builder.append(kSkipField, _skip.get());
}
if (_hint) {
builder.append(kHintField, _hint.get());
}
return builder.obj();
}
StatusWith<CountRequest> CountRequest::parseFromBSON(const std::string& dbname,
const BSONObj& cmdObj) {
BSONElement firstElt = cmdObj.firstElement();
const std::string coll = (firstElt.type() == BSONType::String) ? firstElt.str() : "";
const std::string ns = str::stream() << dbname << "." << coll;
if (!nsIsFull(ns)) {
return Status(ErrorCodes::BadValue, "invalid collection name");
}
// We don't validate that "query" is a nested object due to SERVER-15456.
CountRequest request(ns, cmdObj.getObjectField(kQueryField));
// Limit
if (cmdObj[kLimitField].isNumber()) {
long long limit = cmdObj[kLimitField].numberLong();
// For counts, limit and -limit mean the same thing.
if (limit < 0) {
limit = -limit;
}
request.setLimit(limit);
}
else if (cmdObj[kLimitField].ok()) {
return Status(ErrorCodes::BadValue, "limit value is not a valid number");
}
// Skip
if (cmdObj[kSkipField].isNumber()) {
long long skip = cmdObj[kSkipField].numberLong();
if (skip < 0) {
return Status(ErrorCodes::BadValue, "skip value is negative in count query");
}
request.setSkip(skip);
}
else if (cmdObj[kSkipField].ok()) {
return Status(ErrorCodes::BadValue, "skip value is not a valid number");
}
// Hint
if (Object == cmdObj[kHintField].type()) {
request.setHint(cmdObj[kHintField].Obj());
}
else if (String == cmdObj[kHintField].type()) {
const std::string hint = cmdObj.getStringField(kHintField);
request.setHint(BSON("$hint" << hint));
}
return request;
}
} // namespace mongo
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