src/common/basichandler.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2005-2019 by the Quassel Project                        *
   3  *   devel@quassel-irc.org                                                 *
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  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
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  20
  21 #include "basichandler.h"
  22
  23 #include <utility>
  24
  25 #include <QDebug>
  26 #include <QMetaMethod>
  27
  28 BasicHandler::BasicHandler(QObject* parent)
  29     : QObject(parent)
  30     , _methodPrefix("handle")
  31 {}
  32
  33 BasicHandler::BasicHandler(QString methodPrefix, QObject* parent)
  34     : QObject(parent)
  35     , _methodPrefix(std::move(methodPrefix))
  36 {}
  37
  38 QStringList BasicHandler::providesHandlers()
  39 {
  40     return handlerHash().keys();
  41 }
  42
  43 const QHash<QString, int>& BasicHandler::handlerHash()
  44 {
  45     if (!_initDone) {
  46         for (int i = metaObject()->methodOffset(); i < metaObject()->methodCount(); i++) {
  47             QString methodSignature = metaObject()->method(i).methodSignature();
  48             if (methodSignature.startsWith("defaultHandler")) {
  49                 _defaultHandler = i;
  50                 continue;
  51             }
  52
  53             if (!methodSignature.startsWith(_methodPrefix))
  54                 continue;
  55
  56             methodSignature = methodSignature.section('(', 0, 0);           // chop the attribute list
  57             methodSignature = methodSignature.mid(_methodPrefix.length());  // strip "handle" or whatever the prefix is
  58             _handlerHash[methodSignature] = i;
  59         }
  60         _initDone = true;
  61     }
  62     return _handlerHash;
  63 }
  64
  65 void BasicHandler::handle(const QString& member,
  66                           QGenericArgument val0,
  67                           QGenericArgument val1,
  68                           QGenericArgument val2,
  69                           QGenericArgument val3,
  70                           QGenericArgument val4,
  71                           QGenericArgument val5,
  72                           QGenericArgument val6,
  73                           QGenericArgument val7,
  74                           QGenericArgument val8)
  75 {
  76     // Now we try to find a handler for this message. BTW, I do love the Trolltech guys ;-)
  77     // and now we even have a fast lookup! Thanks thiago!
  78
  79     QString handler = member.toLower();
  80     handler[0] = handler[0].toUpper();
  81
  82     if (!handlerHash().contains(handler)) {
  83         if (_defaultHandler == -1) {
  84             qWarning() << QString("No such Handler: %1::%2%3").arg(metaObject()->className(), _methodPrefix, handler);
  85             return;
  86         }
  87         else {
  88             void* param[] = {nullptr,
  89                              Q_ARG(QString, member).data(),
  90                              val0.data(),
  91                              val1.data(),
  92                              val2.data(),
  93                              val3.data(),
  94                              val4.data(),
  95                              val5.data(),
  96                              val6.data(),
  97                              val7.data(),
  98                              val8.data(),
  99                              val8.data()};
 100             qt_metacall(QMetaObject::InvokeMetaMethod, _defaultHandler, param);
 101             return;
 102         }
 103     }
 104
 105     void* param[] = {nullptr,
 106                      val0.data(),
 107                      val1.data(),
 108                      val2.data(),
 109                      val3.data(),
 110                      val4.data(),
 111                      val5.data(),
 112                      val6.data(),
 113                      val7.data(),
 114                      val8.data(),
 115                      val8.data(),
 116                      nullptr};
 117     qt_metacall(QMetaObject::InvokeMetaMethod, handlerHash()[handler], param);
 118 }