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/* Copyright 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 <vector>
#include "mongo/base/status.h"
#include "mongo/base/string_data.h"
#include "mongo/bson/bsontypes.h"
namespace mongo {
class BSONObj;
class BSONElement;
class OID;
class Timestamp;
/**
* Finds an element named "fieldName" in "object".
*
* Returns Status::OK() and sets "*outElement" to the found element on success. Returns
* ErrorCodes::NoSuchKey if there are no matches.
*/
Status bsonExtractField(const BSONObj& object, StringData fieldName, BSONElement* outElement);
/**
* Finds an element named "fieldName" in "object".
*
* Returns Status::OK() and sets *outElement to the found element on success. Returns
* ErrorCodes::NoSuchKey if there are no matches for "fieldName", and ErrorCodes::TypeMismatch
* if the type of the matching element is not "type". For return values other than
* Status::OK(), the resulting value of "*outElement" is undefined.
*/
Status bsonExtractTypedField(const BSONObj& object,
StringData fieldName,
BSONType type,
BSONElement* outElement);
/**
* Finds a bool-like element named "fieldName" in "object".
*
* Returns Status::OK() and sets *out to the found element's boolean value on success. Returns
* ErrorCodes::NoSuchKey if there are no matches for "fieldName", and ErrorCodes::TypeMismatch
* if the type of the matching element is not Bool or a number type. For return values other
* than Status::OK(), the resulting value of "*out" is undefined.
*/
Status bsonExtractBooleanField(const BSONObj& object, StringData fieldName, bool* out);
/**
* Finds an element named "fieldName" in "object" that represents an integral value.
*
* Returns Status::OK() and sets *out to the element's 64-bit integer value representation on
* success. Returns ErrorCodes::NoSuchKey if there are no matches for "fieldName". Returns
* ErrorCodes::TypeMismatch if the value of the matching element is not of a numeric type.
* Returns ErrorCodes::BadValue if the value does not have an exact 64-bit integer
* representation. For return values other than Status::OK(), the resulting value of "*out" is
* undefined.
*/
Status bsonExtractIntegerField(const BSONObj& object, StringData fieldName, long long* out);
/**
* Finds a string-typed element named "fieldName" in "object" and stores its value in "out".
*
* Returns Status::OK() and sets *out to the found element's std::string value on success. Returns
* ErrorCodes::NoSuchKey if there are no matches for "fieldName", and ErrorCodes::TypeMismatch
* if the type of the matching element is not String. For return values other than
* Status::OK(), the resulting value of "*out" is undefined.
*/
Status bsonExtractStringField(const BSONObj& object, StringData fieldName, std::string* out);
/**
* Finds an Timestamp-typed element named "fieldName" in "object" and stores its value in "out".
*
* Returns Status::OK() and sets *out to the found element's Timestamp value on success. Returns
* ErrorCodes::NoSuchKey if there are no matches for "fieldName", and ErrorCodes::TypeMismatch
* if the type of the matching element is not Timestamp. For return values other than
* Status::OK(), the resulting value of "*out" is undefined.
*/
Status bsonExtractTimestampField(const BSONObj& object, StringData fieldName, Timestamp* out);
/**
* Finds an OID-typed element named "fieldName" in "object" and stores its value in "out".
*
* Returns Status::OK() and sets *out to the found element's OID value on success. Returns
* ErrorCodes::NoSuchKey if there are no matches for "fieldName", and ErrorCodes::TypeMismatch
* if the type of the matching element is not OID. For return values other than Status::OK(),
* the resulting value of "*out" is undefined.
*/
Status bsonExtractOIDField(const BSONObj& object, StringData fieldName, OID* out);
/**
* Finds a bool-like element named "fieldName" in "object".
*
* If a field named "fieldName" is present, and is either a number or boolean type, stores the
* truth value of the field into "*out". If no field named "fieldName" is present, sets "*out"
* to "defaultValue". In these cases, returns Status::OK().
*
* If "fieldName" is present more than once, behavior is undefined. If the found field is not a
* boolean or number, returns ErrorCodes::TypeMismatch.
*/
Status bsonExtractBooleanFieldWithDefault(const BSONObj& object,
StringData fieldName,
bool defaultValue,
bool* out);
/**
* Finds an element named "fieldName" in "object" that represents an integral value.
*
* If a field named "fieldName" is present and is a value of numeric type with an exact 64-bit
* integer representation, returns that representation in *out and returns Status::OK(). If
* there is no field named "fieldName", stores defaultValue into *out and returns Status::OK().
* If the field is found, but has non-numeric type, returns ErrorCodes::TypeMismatch. If the
* value has numeric type, but cannot be represented as a 64-bit integer, returns
* ErrorCodes::BadValue.
*/
Status bsonExtractIntegerFieldWithDefault(const BSONObj& object,
StringData fieldName,
long long defaultValue,
long long* out);
/**
* Finds a std::string element named "fieldName" in "object".
*
* If a field named "fieldName" is present, and is a string, stores the value of the field into
* "*out". If no field named fieldName is present, sets "*out" to "defaultValue". In these
* cases, returns Status::OK().
*
* If "fieldName" is present more than once, behavior is undefined. If the found field is not a
* string, returns ErrorCodes::TypeMismatch.
*/
Status bsonExtractStringFieldWithDefault(const BSONObj& object,
StringData fieldName,
StringData defaultValue,
std::string* out);
/**
* Finds an OID-typed element named "fieldName" in "object" and stores its value in *out.
*
* Returns Status::OK() and sets *out to the found element's OID value on success. If no field
* named "fieldName" is present, *out is set to "defaultValue" and Status::OK() is returned.
* Returns ErrorCodes::TypeMismatch if the type of the matching element is not OID. For return
* values other than Status::OK(), the resulting value of *out is undefined.
*/
Status bsonExtractOIDFieldWithDefault(const BSONObj& object,
StringData fieldName,
const OID& defaultValue,
OID* out);
} // namespace mongo
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