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akonadi

exception.cpp
00001 /*
00002     Copyright (c) 2009 Volker Krause <vkrause@kde.org>
00003 
00004     This library is free software; you can redistribute it and/or modify it
00005     under the terms of the GNU Library General Public License as published by
00006     the Free Software Foundation; either version 2 of the License, or (at your
00007     option) any later version.
00008 
00009     This library is distributed in the hope that it will be useful, but WITHOUT
00010     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
00011     FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
00012     License for more details.
00013 
00014     You should have received a copy of the GNU Library General Public License
00015     along with this library; see the file COPYING.LIB.  If not, write to the
00016     Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
00017     02110-1301, USA.
00018 */
00019 
00020 #include "exception.h"
00021 
00022 #include <KDebug>
00023 #include <QString>
00024 
00025 #include <memory>
00026 
00027 using namespace Akonadi;
00028 
00029 class Exception::Private
00030 {
00031   public:
00032     QByteArray what;
00033     QByteArray assembledWhat;
00034 };
00035 
00036 Exception::Exception(const char* what) throw() :
00037   d( 0 )
00038 {
00039   try {
00040     std::auto_ptr<Private> nd( new Private );
00041     nd->what = what;
00042     d = nd.release();
00043   } catch ( ... ) {}
00044 }
00045 
00046 Exception::Exception(const QByteArray& what) throw() :
00047   d( 0 )
00048 {
00049   try {
00050     std::auto_ptr<Private> nd( new Private );
00051     nd->what = what;
00052     d = nd.release();
00053   } catch ( ... ) {}
00054 }
00055 
00056 Exception::Exception(const QString& what) throw() :
00057   d( 0 )
00058 {
00059   try {
00060     std::auto_ptr<Private> nd( new Private );
00061     nd->what = what.toUtf8();
00062     d = nd.release();
00063   } catch ( ... ) {}
00064 }
00065 
00066 Exception::Exception(const Akonadi::Exception& other) throw() :
00067   std::exception( other ), d( 0 )
00068 {
00069   if ( !other.d )
00070     return;
00071   try {
00072     std::auto_ptr<Private> nd( new Private( *other.d ) );
00073     d = nd.release();
00074   } catch ( ... ) {}
00075 }
00076 
00077 Exception::~Exception() throw()
00078 {
00079   delete d;
00080 }
00081 
00082 QByteArray Exception::type() const throw()
00083 {
00084   static const char mytype[] = "Akonadi::Exception";
00085   try {
00086     return QByteArray::fromRawData( "Akonadi::Exception", sizeof(mytype)-1 );
00087   } catch ( ... ) {
00088     return QByteArray();
00089   }
00090 }
00091 
00092 const char* Exception::what() const throw()
00093 {
00094   static const char fallback[] = "<some exception was thrown during construction: message lost>";
00095   if ( !d )
00096     return fallback;
00097   if ( d->assembledWhat.isEmpty() )
00098     try {
00099       d->assembledWhat = QByteArray( type() + ": " + d->what );
00100     } catch ( ... ) {
00101       return "caught some exception while assembling Akonadi::Exception::what() return value";
00102     }
00103   return d->assembledWhat.constData();
00104 }
00105 
00106 #define AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE( classname )       \
00107     Akonadi::classname::~classname() throw() {}                         \
00108     QByteArray Akonadi::classname::type() const throw() {               \
00109         static const char mytype[] = "Akonadi::" #classname ;           \
00110         try {                                                           \
00111             return QByteArray::fromRawData( mytype, sizeof(mytype)-1 ); \
00112         } catch ( ... ) {                                               \
00113             return QByteArray();                                        \
00114         }                                                               \
00115     }
00116 
00117 AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE( PayloadException )
00118 
00119 #undef AKONADI_EXCEPTION_IMPLEMENT_TRIVIAL_INSTANCE

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