icinga2/lib/base/value.hpp

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/******************************************************************************
* Icinga 2 *
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* Copyright (C) 2012-2016 Icinga Development Team (https://www.icinga.org/) *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License *
* as published by the Free Software Foundation; either version 2 *
* of the License, or (at your option) any later version. *
* *
* 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 General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software Foundation *
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#ifndef VALUE_H
#define VALUE_H
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#include "base/object.hpp"
#include "base/string.hpp"
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#include <boost/variant/variant.hpp>
#include <boost/variant/get.hpp>
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namespace icinga
{
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/**
* The type of a Value.
*
* @ingroup base
*/
enum ValueType
{
ValueEmpty = 0,
ValueNumber = 1,
ValueBoolean = 2,
ValueString = 3,
ValueObject = 4
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};
/**
* A type that can hold an arbitrary value.
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*
* @ingroup base
*/
class I2_BASE_API Value
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{
public:
inline Value(void)
{ }
inline Value(int value)
: m_Value(double(value))
{ }
inline Value(unsigned int value)
: m_Value(double(value))
{ }
inline Value(long value)
: m_Value(double(value))
{ }
inline Value(unsigned long value)
: m_Value(double(value))
{ }
inline Value(double value)
: m_Value(value)
{ }
inline Value(bool value)
: m_Value(value)
{ }
inline Value(const String& value)
: m_Value(value)
{ }
inline Value(const char *value)
: m_Value(String(value))
{ }
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inline Value(const Value& other)
: m_Value(other.m_Value)
{ }
inline Value(Object *value)
{
if (!value)
return;
m_Value = Object::Ptr(value);
}
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template<typename T>
inline Value(const intrusive_ptr<T>& value)
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{
if (!value)
return;
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m_Value = static_pointer_cast<Object>(value);
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}
bool ToBool(void) const;
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operator double(void) const;
operator String(void) const;
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Value& operator=(const Value& other);
bool operator==(bool rhs) const;
bool operator!=(bool rhs) const;
bool operator==(int rhs) const;
bool operator!=(int rhs) const;
bool operator==(double rhs) const;
bool operator!=(double rhs) const;
bool operator==(const char *rhs) const;
bool operator!=(const char *rhs) const;
bool operator==(const String& rhs) const;
bool operator!=(const String& rhs) const;
bool operator==(const Value& rhs) const;
bool operator!=(const Value& rhs) const;
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template<typename T>
operator intrusive_ptr<T>(void) const
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{
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if (IsEmpty())
return intrusive_ptr<T>();
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if (!IsObject())
BOOST_THROW_EXCEPTION(std::runtime_error("Cannot convert value of type '" + GetTypeName() + "' to an object."));
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Object::Ptr object = boost::get<Object::Ptr>(m_Value);
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ASSERT(object);
intrusive_ptr<T> tobject = dynamic_pointer_cast<T>(object);
if (!tobject)
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BOOST_THROW_EXCEPTION(std::bad_cast());
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return tobject;
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}
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/**
* Checks whether the variant is empty.
*
* @returns true if the variant is empty, false otherwise.
*/
inline bool IsEmpty(void) const
{
return (GetType() == ValueEmpty || (IsString() && boost::get<String>(m_Value).IsEmpty()));
}
/**
* Checks whether the variant is scalar (i.e. not an object and not empty).
*
* @returns true if the variant is scalar, false otherwise.
*/
inline bool IsScalar(void) const
{
return !IsEmpty() && !IsObject();
}
/**
* Checks whether the variant is a number.
*
* @returns true if the variant is a number.
*/
inline bool IsNumber(void) const
{
return (GetType() == ValueNumber);
}
/**
* Checks whether the variant is a boolean.
*
* @returns true if the variant is a boolean.
*/
inline bool IsBoolean(void) const
{
return (GetType() == ValueBoolean);
}
/**
* Checks whether the variant is a string.
*
* @returns true if the variant is a string.
*/
inline bool IsString(void) const
{
return (GetType() == ValueString);
}
/**
* Checks whether the variant is a non-null object.
*
* @returns true if the variant is a non-null object, false otherwise.
*/
inline bool IsObject(void) const
{
return (GetType() == ValueObject);
}
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template<typename T>
bool IsObjectType(void) const
{
if (!IsObject())
return false;
return (dynamic_pointer_cast<T>(boost::get<Object::Ptr>(m_Value)) != NULL);
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}
/**
* Returns the type of the value.
*
* @returns The type.
*/
ValueType GetType(void) const
{
return static_cast<ValueType>(m_Value.which());
}
String GetTypeName(void) const;
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Type::Ptr GetReflectionType(void) const;
Value Clone(void) const;
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private:
boost::variant<boost::blank, double, bool, String, Object::Ptr> m_Value;
template<typename T>
const T& Get(void) const
{
return boost::get<T>(m_Value);
}
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};
extern I2_BASE_API Value Empty;
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I2_BASE_API Value operator+(const Value& lhs, const char *rhs);
I2_BASE_API Value operator+(const char *lhs, const Value& rhs);
I2_BASE_API Value operator+(const Value& lhs, const String& rhs);
I2_BASE_API Value operator+(const String& lhs, const Value& rhs);
I2_BASE_API Value operator+(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator+(const Value& lhs, double rhs);
I2_BASE_API Value operator+(double lhs, const Value& rhs);
I2_BASE_API Value operator+(const Value& lhs, int rhs);
I2_BASE_API Value operator+(int lhs, const Value& rhs);
I2_BASE_API Value operator-(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator-(const Value& lhs, double rhs);
I2_BASE_API Value operator-(double lhs, const Value& rhs);
I2_BASE_API Value operator-(const Value& lhs, int rhs);
I2_BASE_API Value operator-(int lhs, const Value& rhs);
I2_BASE_API Value operator*(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator*(const Value& lhs, double rhs);
I2_BASE_API Value operator*(double lhs, const Value& rhs);
I2_BASE_API Value operator*(const Value& lhs, int rhs);
I2_BASE_API Value operator*(int lhs, const Value& rhs);
I2_BASE_API Value operator/(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator/(const Value& lhs, double rhs);
I2_BASE_API Value operator/(double lhs, const Value& rhs);
I2_BASE_API Value operator/(const Value& lhs, int rhs);
I2_BASE_API Value operator/(int lhs, const Value& rhs);
I2_BASE_API Value operator%(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator%(const Value& lhs, double rhs);
I2_BASE_API Value operator%(double lhs, const Value& rhs);
I2_BASE_API Value operator%(const Value& lhs, int rhs);
I2_BASE_API Value operator%(int lhs, const Value& rhs);
I2_BASE_API Value operator^(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator^(const Value& lhs, double rhs);
I2_BASE_API Value operator^(double lhs, const Value& rhs);
I2_BASE_API Value operator^(const Value& lhs, int rhs);
I2_BASE_API Value operator^(int lhs, const Value& rhs);
I2_BASE_API Value operator&(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator&(const Value& lhs, double rhs);
I2_BASE_API Value operator&(double lhs, const Value& rhs);
I2_BASE_API Value operator&(const Value& lhs, int rhs);
I2_BASE_API Value operator&(int lhs, const Value& rhs);
I2_BASE_API Value operator|(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator|(const Value& lhs, double rhs);
I2_BASE_API Value operator|(double lhs, const Value& rhs);
I2_BASE_API Value operator|(const Value& lhs, int rhs);
I2_BASE_API Value operator|(int lhs, const Value& rhs);
I2_BASE_API Value operator<<(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator<<(const Value& lhs, double rhs);
I2_BASE_API Value operator<<(double lhs, const Value& rhs);
I2_BASE_API Value operator<<(const Value& lhs, int rhs);
I2_BASE_API Value operator<<(int lhs, const Value& rhs);
I2_BASE_API Value operator>>(const Value& lhs, const Value& rhs);
I2_BASE_API Value operator>>(const Value& lhs, double rhs);
I2_BASE_API Value operator>>(double lhs, const Value& rhs);
I2_BASE_API Value operator>>(const Value& lhs, int rhs);
I2_BASE_API Value operator>>(int lhs, const Value& rhs);
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I2_BASE_API bool operator<(const Value& lhs, const Value& rhs);
I2_BASE_API bool operator<(const Value& lhs, double rhs);
I2_BASE_API bool operator<(double lhs, const Value& rhs);
I2_BASE_API bool operator<(const Value& lhs, int rhs);
I2_BASE_API bool operator<(int lhs, const Value& rhs);
I2_BASE_API bool operator>(const Value& lhs, const Value& rhs);
I2_BASE_API bool operator>(const Value& lhs, double rhs);
I2_BASE_API bool operator>(double lhs, const Value& rhs);
I2_BASE_API bool operator>(const Value& lhs, int rhs);
I2_BASE_API bool operator>(int lhs, const Value& rhs);
I2_BASE_API bool operator<=(const Value& lhs, const Value& rhs);
I2_BASE_API bool operator<=(const Value& lhs, double rhs);
I2_BASE_API bool operator<=(double lhs, const Value& rhs);
I2_BASE_API bool operator<=(const Value& lhs, int rhs);
I2_BASE_API bool operator<=(int lhs, const Value& rhs);
I2_BASE_API bool operator>=(const Value& lhs, const Value& rhs);
I2_BASE_API bool operator>=(const Value& lhs, double rhs);
I2_BASE_API bool operator>=(double lhs, const Value& rhs);
I2_BASE_API bool operator>=(const Value& lhs, int rhs);
I2_BASE_API bool operator>=(int lhs, const Value& rhs);
I2_BASE_API std::ostream& operator<<(std::ostream& stream, const Value& value);
I2_BASE_API std::istream& operator>>(std::istream& stream, Value& value);
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}
#endif /* VALUE_H */