icinga2/lib/base/value.cpp

316 lines
7.0 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012-2013 Icinga Development Team (http://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 *
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. *
******************************************************************************/
#include "base/application.h"
#include "base/array.h"
#include "base/logger_fwd.h"
#include "base/utility.h"
#include <cJSON.h>
#include <boost/lexical_cast.hpp>
using namespace icinga;
Value Empty;
Value::Value(void)
: m_Value()
{ }
Value::Value(int value)
: m_Value(double(value))
{ }
Value::Value(unsigned int value)
: m_Value(double(value))
{ }
Value::Value(long value)
: m_Value(double(value))
{ }
Value::Value(unsigned long value)
: m_Value(double(value))
{ }
Value::Value(double value)
: m_Value(value)
{ }
Value::Value(const String& value)
: m_Value(value)
{ }
Value::Value(const char *value)
: m_Value(String(value))
{ }
/**
* Checks whether the variant is empty.
*
* @returns true if the variant is empty, false otherwise.
*/
bool Value::IsEmpty(void) const
{
return (GetType() == ValueEmpty);
}
/**
* Checks whether the variant is scalar (i.e. not an object and not empty).
*
* @returns true if the variant is scalar, false otherwise.
*/
bool Value::IsScalar(void) const
{
return !IsEmpty() && !IsObject();
}
/**
* Checks whether the variant is a non-null object.
*
* @returns true if the variant is a non-null object, false otherwise.
*/
bool Value::IsObject(void) const
{
return !IsEmpty() && (GetType() == ValueObject);
}
Value::operator double(void) const
{
const double *value = boost::get<double>(&m_Value);
if (value)
return *value;
if (IsEmpty())
return 0;
return boost::lexical_cast<double>(m_Value);
}
Value::operator String(void) const
{
Object *object;
double integral, fractional;
switch (GetType()) {
case ValueEmpty:
return String();
case ValueNumber:
fractional = modf(boost::get<double>(m_Value), &integral);
if (fractional != 0)
return boost::lexical_cast<String>(m_Value);
else
return boost::lexical_cast<String>((long)integral);
case ValueString:
return boost::get<String>(m_Value);
case ValueObject:
object = boost::get<Object::Ptr>(m_Value).get();
return "Object of type '" + Utility::GetTypeName(typeid(*object)) + "'";
default:
BOOST_THROW_EXCEPTION(std::runtime_error("Unknown value type."));
}
}
/**
* Converts a JSON object into a variant.
*
* @param json The JSON object.
*/
Value Value::FromJson(cJSON *json)
{
if (json->type == cJSON_Number)
return json->valuedouble;
else if (json->type == cJSON_String)
return String(json->valuestring);
else if (json->type == cJSON_True)
return 1;
else if (json->type == cJSON_False)
return 0;
else if (json->type == cJSON_Object)
return Dictionary::FromJson(json);
else if (json->type == cJSON_Array)
return Array::FromJson(json);
else if (json->type == cJSON_NULL)
return Value();
else
BOOST_THROW_EXCEPTION(std::invalid_argument("Unsupported JSON type."));
}
/**
* Serializes the variant.
*
* @returns A JSON object representing this variant.
*/
cJSON *Value::ToJson(void) const
{
switch (GetType()) {
case ValueNumber:
return cJSON_CreateNumber(boost::get<double>(m_Value));
case ValueString:
return cJSON_CreateString(boost::get<String>(m_Value).CStr());
case ValueObject:
if (IsObjectType<Dictionary>()) {
Dictionary::Ptr dictionary = *this;
return dictionary->ToJson();
} else if (IsObjectType<Array>()) {
Array::Ptr array = *this;
return array->ToJson();
} else {
return cJSON_CreateNull();
}
case ValueEmpty:
return cJSON_CreateNull();
default:
BOOST_THROW_EXCEPTION(std::runtime_error("Invalid variant type."));
}
}
/**
* Returns the type of the value.
*
* @returns The type.
*/
ValueType Value::GetType(void) const
{
return static_cast<ValueType>(m_Value.which());
}
bool Value::operator==(bool rhs)
{
if (!IsScalar())
return false;
return static_cast<double>(*this) == rhs;
}
bool Value::operator!=(bool rhs)
{
return !(*this == rhs);
}
bool Value::operator==(int rhs)
{
if (!IsScalar())
return false;
return static_cast<double>(*this) == rhs;
}
bool Value::operator!=(int rhs)
{
return !(*this == rhs);
}
bool Value::operator==(double rhs)
{
if (!IsScalar())
return false;
return static_cast<double>(*this) == rhs;
}
bool Value::operator!=(double rhs)
{
return !(*this == rhs);
}
bool Value::operator==(const char *rhs)
{
return static_cast<String>(*this) == rhs;
}
bool Value::operator!=(const char *rhs)
{
return !(*this == rhs);
}
bool Value::operator==(const String& rhs)
{
return static_cast<String>(*this) == rhs;
}
bool Value::operator!=(const String& rhs)
{
return !(*this == rhs);
}
bool Value::operator==(const Value& rhs)
{
if (IsEmpty() != rhs.IsEmpty())
return false;
if (IsEmpty())
return true;
if (IsObject() != rhs.IsObject())
return false;
if (IsObject())
return static_cast<Object::Ptr>(*this) == static_cast<Object::Ptr>(rhs);
if (GetType() == ValueNumber || rhs.GetType() == ValueNumber)
return static_cast<double>(*this) == static_cast<double>(rhs);
else
return static_cast<String>(*this) == static_cast<String>(rhs);
}
bool Value::operator!=(const Value& rhs)
{
return !(*this == rhs);
}
Value icinga::operator+(const Value& lhs, const char *rhs)
{
return static_cast<String>(lhs) + rhs;
}
Value icinga::operator+(const char *lhs, const Value& rhs)
{
return lhs + static_cast<String>(rhs);
}
Value icinga::operator+(const Value& lhs, const String& rhs)
{
return static_cast<String>(lhs) + rhs;
}
Value icinga::operator+(const String& lhs, const Value& rhs)
{
return lhs + static_cast<String>(rhs);
}
std::ostream& icinga::operator<<(std::ostream& stream, const Value& value)
{
stream << static_cast<String>(value);
return stream;
}
std::istream& icinga::operator>>(std::istream& stream, Value& value)
{
String tstr;
stream >> tstr;
value = tstr;
return stream;
}