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/***************************************************************************
* jvmfunction.h
* This file is part of the KDE project
* copyright (C)2007 by Sebastian Sauer <mail@dipe.org>
* copyright (C)2007 by Vincent Verhoeven <verhoevenv@gmail.com>
*
* Parts of the code are from kjsembed4 SlotProxy
* Copyright (C) 2005, 2006 KJSEmbed Authors.
*
* This program 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 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
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
***************************************************************************/
#ifndef KROSS_JVMFUNCTION_H
#define KROSS_JVMFUNCTION_H
#include "jvmconfig.h"
#include "jvmvariant.h"
#include "jvminterpreter.h"
#include <kross/core/krossconfig.h>
#include <kross/core/metafunction.h>
#include <QObject>
#include <QMetaObject>
#include <QMetaMethod>
#include <QByteArray>
namespace Kross {
/**
* The JVMFunction class implements a QObject to provide
* an adaptor between Qt signals+slots and Java functions (jmethods).
*/
class JVMFunction : public MetaFunction
{
public:
/**
* Constructor.
*
* \param sender The QObject instance that sends the signal.
* \param signal The signature of the signal the QObject emits.
* \param instance The Java Object on which to invoke the method.
* \param callable The callable Java function (a java.lang.reflect.Method) that should
* be executed if the QObject emits the signal.
* \param env The Java environment where the Java objects live.
*/
JVMFunction(QObject* sender, const QByteArray& signal, jobject instance, jobject callable, JNIEnv* env)
: MetaFunction(sender, signal), m_env(env) {
m_callable = m_env->NewGlobalRef(callable);
m_instance = m_env->NewGlobalRef(instance);
}
/**
* Destructor.
*/
virtual ~JVMFunction() {
m_env->DeleteGlobalRef(m_instance);
m_env->DeleteGlobalRef(m_callable);
}
/**
* This method got called if a method this QObject instance
* defines should be invoked.
*/
int qt_metacall(QMetaObject::Call _c, int _id, void **_a)
{
//The method might be called from a different thread, so we get the right JNIEnv.
JNIEnv* m_env = JVMInterpreter::getEnv();
_id = QObject::qt_metacall(_c, _id, _a);
#ifdef KROSS_JVM_FUNCTION_DEBUG
krossdebug(QString("JVMFunction::qt_metacall id=%1").arg(_id));
#endif
if(_id >= 0 && _c == QMetaObject::InvokeMetaMethod) {
switch(_id) {
case 0: {
// convert the arguments
QMetaMethod method = metaObject()->method( metaObject()->indexOfMethod(m_signature) );
QList<QByteArray> params = method.parameterTypes();
//Py::Tuple args( params.size() );
jclass objclass = m_env->FindClass("java/lang/Object");
jobjectArray args = m_env->NewObjectArray(params.size(), objclass, NULL);
int idx = 1;
foreach(QByteArray param, params) {
int tp = QVariant::nameToType( param.constData() );
switch(tp) {
case QVariant::Invalid: // fall through
case QVariant::UserType: {
tp = QMetaType::type( param.constData() );
#ifdef KROSS_JVM_FUNCTION_DEBUG
krossdebug( QString("JVMFunction::qt_metacall: metatypeId=%1").arg(tp) );
#endif
switch( tp ) {
case QMetaType::QObjectStar: {
QObject* obj = (*reinterpret_cast< QObject*(*)>( _a[idx] ));
//args[idx-1] = Py::asObject(new JVMExtension(obj, false));
const JVMExtension* ext = JVMInterpreter::extension(obj);
if(ext == 0)
ext = new JVMExtension(obj);
m_env->SetObjectArrayElement(args, idx-1, ext->javaobject());
} break;
#if 0
case QMetaType::QWidgetStar: {
QWidget* obj = (*reinterpret_cast< QWidget*(*)>( _a[idx] ));
//args[idx-1] = Py::asObject(new JVMExtension(obj, false));
args[idx-1] = Py::asObject(new JVMExtension(obj));
} break;
#endif
default: {
m_env->SetObjectArrayElement(args, idx-1, NULL);
} break;
}
} break;
default: {
QVariant v(tp, _a[idx]);
#ifdef KROSS_JVM_FUNCTION_DEBUG
krossdebug( QString("JVMFunction::qt_metacall argument param=%1 typeId=%2").arg(param.constData()).arg(tp) );
#endif
jobject javaArg = JavaType<QVariant>::toJObject(v, m_env);
m_env->SetObjectArrayElement(args, idx-1, javaArg);
} break;
}
++idx;
}
jclass methodclass = m_env->FindClass("java/lang/reflect/Method");
jmethodID invoke = m_env->GetMethodID(methodclass,"invoke","(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;");
jobject result = m_env->CallObjectMethod(m_callable, invoke, m_instance, args);
#if 0
try {
// call the JVM function
result = m_callable.apply(args);
}
catch(Py::Exception& e) {
QStringList trace;
int lineno;
JVMInterpreter::extractException(trace, lineno);
krosswarning( QString("JVMFunction::qt_metacall exception on line %1:\n%2 \n%3").arg(lineno).arg(Py::value(e).as_string().c_str()).arg(trace.join("\n")) );
PyErr_Print(); //e.clear();
return -1;
}
// finally set the returnvalue
m_tmpResult = JavaType<QVariant>::toVariant(result, m_env);
#ifdef KROSS_JVM_FUNCTION_DEBUG
QObject* sender = QObject::sender();
krossdebug( QString("JVMFunction::qt_metacall sender.objectName=%1 sender.className=%2 variantresult=%3").arg(sender->objectName()).arg(sender->metaObject()->className()).arg(m_tmpResult.toString()) );
#endif
//_a[0] = Kross::MetaTypeVariant<QVariant>(d->tmpResult).toVoidStar();
_a[0] = &(m_tmpResult);
#endif
} break;
}
_id -= 1;
}
return _id;
}
private:
jobject m_instance;
jobject m_callable;
JNIEnv* m_env;
QVariant m_tmpResult;
};
}
#endif
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