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/* qdbusdataconverter.h TQT_DBusDataConverter template
*
* Copyright (C) 2007 Kevin Krammer <[email protected]>
*
* Licensed under the Academic Free License version 2.1
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*
*/
#ifndef TQDBUSDATACONVERTER_H
#define TQDBUSDATACONVERTER_H
#include "tqdbusmacros.h"
class TQT_DBusData;
/**
* @brief Template based converter for getting complex data into or from TQT_DBusData objects
*
* Any data to transport over D-Bus, i.e. method/signal paramaters or properties, need
* to be converted into a TQT_DBusData instance.
*
* For complex types, e.g. structures or nested containers, this can be quite some code,
* and will likely be needed for more than one call.
* Therefore it is more convenient to implement the conversions once per complex type.
*
* Example: sending and recieving a TQRect over D-Bus.
* In D-Bus terminology a TQRect is a struct of four 32-bit signed integers. The code to do
* this manually looks like this:
* @code
* TQRect rect(0, 0, 100, 100);
*
* TQValueList<TQT_DBusData> structMembers;
* structMembers << TQT_DBusData::fromInt32(rect.x());
* structMembers << TQT_DBusData::fromInt32(rect.y());
* structMembers << TQT_DBusData::fromInt32(rect.wdth());
* structMembers << TQT_DBusData::fromInt32(rect.height());
*
* TQT_DBusData rectStruct = TQT_DBusData::fromStruct(structMembers);
* @endcode
* and reverse (without the error checking)
* @code
* TQT_DBusData dbusData; // assume we got this from a D-Bus call
*
* TQValueList<TQT_DBusData> structMembers = dbudData.toStruct();
*
* int x = structMembers[0].toInt32();
* int y = structMembers[1].toInt32();
* int w = structMembers[2].toInt32();
* int h = structMembers[3].toInt32();
*
* TQRect rect(x, y, w, h);
* @endcode
*
* Rather than implementing it in the method which performs the D-Bus call, basically the same
* code can be used as a spezialisation of the TQT_DBusDataConverter methods and then used like this:
* @code
* TQRect rect(0, 0, 100, 100);
* TQT_DBusData rectStruct;
*
* TQT_DBusDataConverter::convertToTQT_DBusData<TQRect>(rect, rectStruct);
* @endcode
* and
* @code
* TQRect rect;
* TQT_DBusData dbusData; // assume we got this from a D-Bus call
*
* TQT_DBusDataConverter::convertFromTQT_DBusData<TQRect>(dbusData, rect);
* @endcode
*
* @note The bindings library contains the spezialisations for TQRect, TQPoint and TQSize.
*/
class TQDBUS_EXPORT TQT_DBusDataConverter
{
public:
/**
* @brief Conversion result values
*/
enum Result
{
/**
* Conversion successfull
*/
Success,
/**
* Conversion failed because the passed TQT_DBusData instance does not contain data
* of the needed signature, e.g. too few to too many members for a struct or wrong types.
*
* @see TQT_DBusError::stdInvalidSignature()
*/
InvalidSignature,
/**
* Conversion failed because the passed TQT_DBusData contained values which are not allowed,
* e.g. out of range for a numerical type used a an enum or flags.
*
* @see TQT_DBusError::stdInvalidArgs()
*/
InvalidArgument
};
/**
* @brief Conversion from a filled TQT_DBusData instance to a native type
*
* For example the implementation for TQPoint looks like this:
* @code
* template <>
* TQT_DBusDataConverter::Result
* TQT_DBusDataConverter::convertFromTQT_DBusData<TQPoint>(const TQT_DBusData& dbusData, TQPoint& typeData)
* {
* if (dbusData.type() != TQT_DBusData::Struct) return InvalidSignature;
*
* TQValueList<TQT_DBusData> members = dbusData.toStruct();
* if (members.count() != 2) return InvalidSignature;
*
* bool ok = false;
* int x = members[0].toInt32(&ok);
* if (!ok) return InvalidSignature;
*
* int y = members[1].toInt32(&ok);
* if (!ok) return InvalidSignature;
*
* typeData = TQPoint(x, y);
*
* return Success;
* }
* @endcode
*
* And then can be used like this:
* @code
* TQT_DBusMessage reply; // assume we got this as a D-Bus call reply
* TQPoint point;
*
* if (TQT_DBusDataConverter::convertFromTQT_DBusData(reply[0], point) != TQT_DBusDataConverter::Success)
* {
* // error handling
* }
* @endcode
*
* @param dbusData the binding's data instance to get the content from
* @param typeData the native type instance to put the content into
*
* @return the conversion result value
*/
template <class T>
static Result convertFromTQT_DBusData(const TQT_DBusData& dbusData, T& typeData);
/**
* @brief Conversion from a native type to a TQT_DBusData instance
*
* For example the implementation for TQPoint looks like this:
* @code
* template <>
* TQT_DBusDataConversion::Result
* TQT_DBusDataConversion::convertToTQT_DBusData<TQPoint>(const TQPoint& typeData, TQT_DBusData& dbusData)
* {
* TQValueList<TQT_DBusData> members;
* members << TQT_DBusData::fromInt32(typeData.x());
* members << TQT_DBusData::fromInt32(typeData.y());
*
* dbusData = TQT_DBusData::fromStruct(members);
*
* return Success;
* }
* @endcode
*
* And then can be used like this:
* @code
* TQPoint point(-10, 100);
* TQT_DBusMessage methodCall; // assume created by TQBusMessage::methodCall()
*
* TQT_DBusData dbusData;
* if (TQT_DBusDataConverter::convertToTQT_DBusData<TQPoint>(point, dbusData) != TQT_DBusDataConverter::Success)
* {
* // error handling
* }
* else
* {
* methodCall << dbusData;
* }
* @endcode
*
* @param typeData the native type instance to get the content from
* @param dbusData the binding's data instance to put the content into
*
* @return the conversion result value
*/
template <class T>
static Result convertToTQT_DBusData(const T& typeData, TQT_DBusData& dbusData);
};
#endif
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