icinga2/lib/base/value.cpp

231 lines
5.8 KiB
C++

/******************************************************************************
* Icinga 2 *
* Copyright (C) 2012 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(value)
{ }
Value::Value(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 (m_Value.type() == typeid(boost::blank));
}
/**
* 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() && (m_Value.type() == typeid(Object::Ptr));
}
Value::operator double(void) const
{
if (m_Value.type() != typeid(double)) {
return boost::lexical_cast<double>(m_Value);
} else {
return boost::get<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 a variant into a string.
*
* @returns A string representing this variant.
*/
String Value::Serialize(void) const
{
cJSON *json = ToJson();
char *jsonString;
if (Application::IsDebugging())
jsonString = cJSON_Print(json);
else
jsonString = cJSON_PrintUnformatted(json);
cJSON_Delete(json);
String result = jsonString;
free(jsonString);
return result;
}
/**
* 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 {
Log(LogDebug, "base", "Ignoring unknown object while converting variant to JSON.");
return cJSON_CreateNull();
}
case ValueEmpty:
return cJSON_CreateNull();
default:
BOOST_THROW_EXCEPTION(std::runtime_error("Invalid variant type."));
}
}
/**
* Deserializes the string representation of a variant.
*
* @param jsonString A JSON string obtained from Value::Serialize
* @returns The newly deserialized variant.
*/
Value Value::Deserialize(const String& jsonString)
{
cJSON *json = cJSON_Parse(jsonString.CStr());
if (!json)
BOOST_THROW_EXCEPTION(std::runtime_error("Invalid JSON String"));
Value value = FromJson(json);
cJSON_Delete(json);
return value;
}
/**
* Returns the type of the value.
*
* @returns The type.
*/
ValueType Value::GetType(void) const
{
return static_cast<ValueType>(m_Value.which());
}