exception.cpp

/*
    Copyright (c) 2009 Volker Krause <vkrause@kde.org>

    This library is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published by
    the Free Software Foundation; either version 2 of the License, or (at your
    option) any later version.

    This library 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 Library General Public
    License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to the
    Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
    02110-1301, USA.
*/

#include "exception.h"

#include <KDebug>
#include <QString>

#include <memory>

using namespace Akonadi;

class Exception::Private
{
  public:
    QByteArray what;
    QByteArray assembledWhat;
};

Exception::Exception(const char* what) throw() :
  d( 0 )
{
  try {
    std::auto_ptr<Private> nd( new Private );
    nd->what = what;
    d = nd.release();
  } catch ( ... ) {}
}

Exception::Exception(const QByteArray& what) throw() :
  d( 0 )
{
  try {
    std::auto_ptr<Private> nd( new Private );
    nd->what = what;
    d = nd.release();
  } catch ( ... ) {}
}

Exception::Exception(const QString& what) throw() :
  d( 0 )
{
  try {
    std::auto_ptr<Private> nd( new Private );
    nd->what = what.toUtf8();
    d = nd.release();
  } catch ( ... ) {}
}

Exception::Exception(const Akonadi::Exception& other) throw() :
  std::exception( other ), d( 0 )
{
  if ( !other.d )
    return;
  try {
    std::auto_ptr<Private> nd( new Private( *other.d ) );
    d = nd.release();
  } catch ( ... ) {}
}

Exception::~Exception() throw()
{
  delete d;
}

QByteArray Exception::type() const throw()
{
  static const char mytype[] = "Akonadi::Exception";
  try {
    return QByteArray::fromRawData( "Akonadi::Exception", sizeof(mytype) - 1 );
  } catch ( ... ) {
    return QByteArray();
  }
}

const char* Exception::what() const throw()
{
  static const char fallback[] = "<some exception was thrown during construction: message lost>";
  if ( !d )
    return fallback;
  if ( d->assembledWhat.isEmpty() )
    try {
      d->assembledWhat = QByteArray( type() + ": " + d->what );
    } catch ( ... ) {
      return "caught some exception while assembling Akonadi::Exception::what() return value";
    }
  return d->assembledWhat.constData();
}

#define AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE( classname )       \
    Akonadi::classname::~classname() throw() {}                         \
    QByteArray Akonadi::classname::type() const throw() {               \
        static const char mytype[] = "Akonadi::" #classname ;           \
        try {                                                           \
            return QByteArray::fromRawData( mytype, sizeof(mytype)-1 ); \
        } catch ( ... ) {                                               \
            return QByteArray();                                        \
        }                                                               \
    }

AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE( PayloadException )

#undef AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE