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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* 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 Server Side 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 <map>
#include <vector>
#include "mongo/base/status.h"
#include "mongo/bson/util/builder.h"
namespace mongo {
namespace optionenvironment {
class Constraint;
class KeyConstraint;
/**
* Helper typedefs for the more complex C++ types supported by this Value class
*/
typedef std::map<std::string, std::string> StringMap_t;
typedef std::vector<std::string> StringVector_t;
typedef std::string Key;
/** A simple container interface for storing various C++ values.
*
* Usage:
*
* Value intVal(2);
* Value stringVal("string");
*
* int intContents = 1;
* Status ret = stringVal.get(&intContents);
* // ret != Status::OK()
* // intContents is still 1
*
* ret = intVal.get(&intContents);
* // ret == Status::OK()
* // intContents is now 2
*/
class Value {
public:
// Constructors
explicit Value() : _type(None) {}
explicit Value(StringVector_t val) : _stringVectorVal(val), _type(StringVector) {}
explicit Value(StringMap_t val) : _stringMapVal(val), _type(StringMap) {}
explicit Value(bool val) : _boolVal(val), _type(Bool) {}
explicit Value(double val) : _doubleVal(val), _type(Double) {}
explicit Value(int val) : _intVal(val), _type(Int) {}
explicit Value(long val) : _longVal(val), _type(Long) {}
explicit Value(std::string val) : _stringVal(val), _type(String) {}
explicit Value(const char* val) : _stringVal(val), _type(String) {}
explicit Value(unsigned long long val) : _unsignedLongLongVal(val), _type(UnsignedLongLong) {}
explicit Value(unsigned val) : _unsignedVal(val), _type(Unsigned) {}
// Access interface
Status get(StringVector_t* val) const;
Status get(StringMap_t* val) const;
Status get(bool* val) const;
Status get(double* val) const;
Status get(int* val) const;
Status get(long* val) const;
Status get(std::string* val) const;
Status get(unsigned long long* val) const;
Status get(unsigned* val) const;
// Utility functions
/**
* Return the value's type as a string
*/
std::string typeToString() const;
/**
* Return true if the value was created with the no argument constructor
*/
bool isEmpty() const;
/**
* Return true if the other Value equals this value, both in type and in contents
*
* Two empty values are equal
*/
bool equal(const Value&) const;
/**
* Return the std::string representation of this Value. This function is used only for
* debugging purposes and does not output data in an easily parseable format.
*/
std::string toString() const;
/**
* The functions below are the legacy interface to be consistent with boost::any during the
* transition period
*/
/**
* Returns the contents of this Value as type T. Throws AssertionException if the type
* does not match
*/
template <typename T>
T as() const;
/**
* Return the type_info for this value
*/
const std::type_info& type() const;
private:
StringVector_t _stringVectorVal;
StringMap_t _stringMapVal;
std::string _stringVal;
union {
bool _boolVal;
double _doubleVal;
int _intVal;
long _longVal;
unsigned long long _unsignedLongLongVal;
unsigned _unsignedVal;
};
// Types currently supported by Value
enum Type {
StringVector, // std::vector<std::string>
StringMap, // std::map<std::string, std::string>
Bool, // bool
Double, // double
Int, // int
Long, // long
String, // std::string
UnsignedLongLong, // unsigned long long
Unsigned, // unsigned
None, // (not set)
};
Type _type;
};
template <typename T>
T Value::as() const {
T valueType;
Status ret = get(&valueType);
if (!ret.isOK()) {
StringBuilder message;
message << "failed to extract typed value from Value container: " << ret.toString();
uasserted(17114, message.str());
}
return valueType;
}
} // namespace optionenvironment
} // namespace mongo
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