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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/>.
*
* 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.
*/
#pragma once
#include <string>
#include "mongo/bson/bson_field.h"
#include "mongo/db/jsobj.h"
#include "mongo/util/time_support.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.
*/
enum FieldState {
// The field is present but has the wrong type
FIELD_INVALID = 0,
// The field is present and has the correct type
FIELD_SET,
// The field is absent in the BSON object but set from default
FIELD_DEFAULT,
// The field is absent and no default was specified
FIELD_NONE
};
static FieldState extract(BSONObj doc,
const BSONField<bool>& field,
bool* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<BSONArray>& field,
BSONArray* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<BSONObj>& field,
BSONObj* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<Date_t>& field,
Date_t* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<string>& field,
string* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<OID>& field,
OID* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<int>& field,
int* out,
string* errMsg = NULL);
static FieldState extract(BSONObj doc,
const BSONField<long long>& field,
long long* out,
string* errMsg = NULL);
/**
* The following extractNumber methods do implicit conversion between any numeric type and
* the BSONField type. This can be useful when an exact numeric type is not needed, for
* example if the field is sometimes modified from the shell which can change the type.
*/
static FieldState extractNumber(BSONObj doc,
const BSONField<int>& field,
int* out,
string* errMsg = NULL);
static FieldState extractNumber(BSONObj doc,
const BSONField<long long>& field,
long long* out,
string* errMsg = NULL);
/**
* The following extract methods are templatized to handle extraction of vectors and
* maps of sub-objects. Keys in the map should be StringData compatible.
*
* It's possible to nest extraction of vectors and maps to any depth, i.e:
*
* vector<map<string,vector<string> > > val;
* FieldParser::extract(doc, field, val, &val);
*/
template<typename T>
static FieldState extract(BSONObj doc,
const BSONField<vector<T> >& field,
vector<T>* out,
string* errMsg = NULL);
template<typename K, typename T>
static FieldState extract(BSONObj doc,
const BSONField<map<K, T> >& field,
map<K, T>* out,
string* errMsg = NULL);
};
} // namespace mongo
// Inline functions for templating
#include "field_parser-inl.h"
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