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/**
* Copyright (C) 2012 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/>.
*/
#pragma once
#include <string>
#include "mongo/bson/bson_field.h"
#include "mongo/bson/util/misc.h" // for Date_t
#include "mongo/db/jsobj.h"
namespace mongo {
class FieldParser {
public:
/**
* Returns true and fills in 'out' with the contents of the field described by 'field'
* or with the value in 'def', depending on whether the field is present and has the
* correct type in 'doc' or not, respectively. Otherwise, if the field exists but has
* the wrong type, returns false.
*
* NOTE ON BSON OWNERSHIP:
*
* The caller must assume that this class will point to data inside 'doc' without
* copying it. In practice this means that 'doc' MUST EXIST for as long as 'out'
* stays in scope.
*/
static bool extract(BSONObj doc,
const BSONField<bool>& field,
bool def,
bool* out);
static bool extract(BSONObj doc,
const BSONField<BSONArray>& field,
const BSONArray& def,
BSONArray* out);
static bool extract(BSONObj doc,
const BSONField<BSONObj>& field,
const BSONObj& def,
BSONObj* out);
static bool extract(BSONObj doc,
const BSONField<Date_t>& field,
const Date_t def,
Date_t* out);
static bool extract(BSONObj doc,
const BSONField<string>& field,
const string& def,
string* out);
static bool extract(BSONObj doc,
const BSONField<OID>& field,
const OID& def,
OID* out);
static bool extract(BSONObj doc,
const BSONField<long long>& field,
const long long& def,
long long* out);
};
} // namespace mongo
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