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/* Copyright 2013 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <vector>
#include "mongo/base/status.h"
namespace mongo {
namespace optionenvironment {
class Constraint;
class KeyConstraint;
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(std::vector<std::string> val) : _stringVectorVal(val), _type(StringVector) {}
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(unsigned long long val) : _unsignedLongLongVal(val),
_type(UnsignedLongLong) { }
explicit Value(unsigned val) : _unsignedVal(val), _type(Unsigned) { }
// Access interface
Status get(std::vector<std::string>* val) const;
Status get(bool* val) const;
Status get(double* val) const;
Status get(int* val) const;
Status get(long* val) const;
Status get(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(Value&) const;
/**
* Return the string representation of this Value
*/
std::string toString() const;
private:
std::vector<std::string> _stringVectorVal;
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>
Bool, // bool
Double, // double
Int, // int
Long, // long
String, // std::string
UnsignedLongLong, // unsigned long long
Unsigned, // unsigned
None, // (not set)
};
Type _type;
};
} // namespace optionenvironment
} // namespace mongo
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