Implement plugin loading based on dependencies

- If plugin A depends on plugin B so A implements interfaces defined in B.
- Such dependency should be informed in A's .json file, build includes and
  linker dependencies are automatically handled by qmake.
- In DuSE-MT startup, dependent plugins (e.g. A) are loaded first so that
  , in B initialization, PluginManager can be queried by using pluginsByType()
  in order to get all plugins implementing a specific interface.

Change-Id: I201f12d2ce6972725f3aa11e9815374cf0948c5d
Reviewed-by: Sandro S. Andrade <sandroandrade@kde.org>

11 files changed, 220 insertions, 253 deletions

diff --git a/examples/uml/duse-mt/src/app/shell/plugincontroller.cpp b/examples/uml/duse-mt/src/app/shell/plugincontroller.cpp
index 315a0b19..83826586 100644
--- a/examples/uml/duse-mt/src/app/shell/plugincontroller.cpp
+++ b/examples/uml/duse-mt/src/app/shell/plugincontroller.cpp
@@ -48,11 +48,14 @@
 #include <QtWidgets/QTreeWidgetItem>
 
 #include <QtCore/QDir>
-#include <QtCore/QStringList>
+#include <QtCore/QJsonArray>
 #include <QtCore/QJsonObject>
+#include <QtCore/QStringList>
 #include <QtCore/QPluginLoader>
 #include <QtCore/QCoreApplication>
 
+#include <QDebug>
+
 namespace DuSE
 {
 
@@ -76,37 +79,68 @@ bool PluginController::initialize()
             QObject *plugin = loader.instance();
             QMetaModelPlugin *metaModelPlugin = 0;
             if (plugin && (metaModelPlugin = qobject_cast<QMetaModelPlugin *>(plugin))) {
-                QJsonObject jsonObject = loader.metaData().value(QString::fromLatin1("MetaData")).toObject();
-                _metamodelPlugins.insert(jsonObject.value(QString::fromLatin1("MetaModelNamespaceUri")).toString(), QPair<QMetaModelPlugin *, QJsonObject>(metaModelPlugin, jsonObject));
+                QJsonObject jsonObject = loader.metaData().value(QStringLiteral("MetaData")).toObject();
+                _metamodelPlugins.insert(jsonObject.value(QStringLiteral("MetaModelNamespaceUri")).toString(), DuSE::IPluginController::MetamodelPluginPair(metaModelPlugin, jsonObject));
             }
         }
     }
     QDir dusePluginsDir(QCoreApplication::applicationDirPath());
     dusePluginsDir.cd("../lib/duse-mt/plugins");
     const QFileInfoList subdirs = dusePluginsDir.entryInfoList(QDir::Dirs|QDir::NoDotAndDotDot);
+    QHash<QString, QString> invertedDependency;
+    QStringList pluginList;
     foreach (const QFileInfo &subdir, subdirs) {
         QDir dusePluginSubDir(subdir.absoluteFilePath());
         foreach (QString fileName, dusePluginSubDir.entryList(QDir::Files)) {
             QPluginLoader loader(dusePluginSubDir.absoluteFilePath(fileName));
             QObject *plugin = loader.instance();
             if (plugin && (dusePlugin = qobject_cast<DuSE::IPlugin *>(plugin))) {
-                dusePlugin->initialize(core);
-                QJsonObject jsonObject = loader.metaData().value(QString::fromLatin1("MetaData")).toObject();
-                _dusemtPlugins << QPair<DuSE::IPlugin *, QJsonObject>(dusePlugin, jsonObject);
+                QJsonObject jsonObject = loader.metaData().value(QStringLiteral("MetaData")).toObject();
+                QJsonArray dependencies = jsonObject.value(QStringLiteral("DependencyList")).toArray();
+                int dependencyCount = dependencies.size();
+                for (int i = 0; i < dependencyCount; ++i)
+                    invertedDependency.insert(dependencies.at(i).toString(), dusePlugin->metaObject()->className());
+                pluginList << dusePluginSubDir.absoluteFilePath(fileName);
+            }
+            delete plugin;
+        }
+    }
+    int previousPluginListSize = 0;
+    while (pluginList.size() != previousPluginListSize) {
+        previousPluginListSize = pluginList.size();
+        foreach (const QString &pluginFileName, pluginList) {
+            QPluginLoader loader(pluginFileName);
+            QObject *plugin = loader.instance();
+            if (plugin && (dusePlugin = qobject_cast<DuSE::IPlugin *>(plugin))) {
+                int dependencyCount = invertedDependency.values(dusePlugin->metaObject()->className()).count();
+                int loadedDependencies = 0;
+                foreach (const QString &dependency, invertedDependency.values(dusePlugin->metaObject()->className())) {
+                    foreach (const DuSE::IPluginController::DusemtPluginPair &pair, _dusemtPlugins) {
+                        if (pair.first->metaObject()->className() == dependency) {
+                            ++loadedDependencies;
+                            break;
+                        }
+                    }
+                }
+                if (loadedDependencies == dependencyCount) {
+                    dusePlugin->initialize(core);
+                    _dusemtPlugins << DuSE::IPluginController::DusemtPluginPair(dusePlugin, loader.metaData().value(QStringLiteral("MetaData")).toObject());
+                    pluginList.removeAll(pluginFileName);
+                }
             }
             else
-                _errorStrings << "Error when loading plugin" << fileName << ":" << loader.errorString();
+                _errorStrings << "Error when loading plugin" << pluginFileName << ":" << loader.errorString();
         }
     }
     return _errorStrings.isEmpty() ? true:false;
 }
 
-const QHash<QString, QPair<QMetaModelPlugin *, QJsonObject> > &PluginController::metamodelPlugins() const
+const QHash<QString, DuSE::IPluginController::MetamodelPluginPair> &PluginController::metamodelPlugins() const
 {
     return _metamodelPlugins;
 }
 
-const QList<QPair<IPlugin *, QJsonObject> > &PluginController::dusemtPlugins() const
+const QList<DuSE::IPluginController::DusemtPluginPair> &PluginController::dusemtPlugins() const
 {
     return _dusemtPlugins;
 }
diff --git a/examples/uml/duse-mt/src/app/shell/plugincontroller.h b/examples/uml/duse-mt/src/app/shell/plugincontroller.h
index c2ee2244..b87a3e52 100644
--- a/examples/uml/duse-mt/src/app/shell/plugincontroller.h
+++ b/examples/uml/duse-mt/src/app/shell/plugincontroller.h
@@ -37,7 +37,7 @@
 **
 ** $QT_END_LICENSE$
 **
-****************************************************************************/
+***************************************************************************/
 #ifndef PLUGINCONTROLLER_H
 #define PLUGINCONTROLLER_H
 
@@ -63,13 +63,13 @@ public:
 
     virtual bool initialize();
 
-    virtual const QHash< QString, QPair<QMetaModelPlugin *, QJsonObject> > &metamodelPlugins() const;
-    virtual const QList< QPair<DuSE::IPlugin *, QJsonObject> > &dusemtPlugins() const;
+    virtual const QHash<QString, DuSE::IPluginController::MetamodelPluginPair> &metamodelPlugins() const;
+    virtual const QList<DuSE::IPluginController::DusemtPluginPair> &dusemtPlugins() const;
     virtual QStringList errorStrings() const;
 
 private:
-    QHash< QString, QPair<QMetaModelPlugin *, QJsonObject> > _metamodelPlugins;
-    QList< QPair<DuSE::IPlugin *, QJsonObject> > _dusemtPlugins;
+    QHash<QString, DuSE::IPluginController::MetamodelPluginPair> _metamodelPlugins;
+    QList<DuSE::IPluginController::DusemtPluginPair> _dusemtPlugins;
     QStringList _errorStrings;
 };
 
diff --git a/examples/uml/duse-mt/src/libs/duseinterfaces/iplugincontroller.h b/examples/uml/duse-mt/src/libs/duseinterfaces/iplugincontroller.h
index 1bdc074d..e5a250e5 100644
--- a/examples/uml/duse-mt/src/libs/duseinterfaces/iplugincontroller.h
+++ b/examples/uml/duse-mt/src/libs/duseinterfaces/iplugincontroller.h
@@ -43,6 +43,9 @@
 
 #include <QtCore/QObject>
 
+#include <QtCore/QPair>
+#include <QtCore/QJsonObject>
+
 class QMetaModelPlugin;
 
 namespace DuSE
@@ -59,10 +62,25 @@ public:
 
     virtual bool initialize() = 0;
 
-    virtual const QHash< QString, QPair<QMetaModelPlugin *, QJsonObject> > &metamodelPlugins() const = 0;
-    virtual const QList< QPair<DuSE::IPlugin *, QJsonObject> > &dusemtPlugins() const = 0;
+    typedef QPair<QMetaModelPlugin *, QJsonObject> MetamodelPluginPair;
+    typedef QPair<IPlugin *, QJsonObject> DusemtPluginPair;
+
+    virtual const QHash<QString, DuSE::IPluginController::MetamodelPluginPair> &metamodelPlugins() const = 0;
+    virtual const QList<DuSE::IPluginController::DusemtPluginPair> &dusemtPlugins() const = 0;
+
     virtual QStringList errorStrings() const = 0;
 
+    template <class T>
+    QList<IPlugin *> pluginsByType() const
+    {
+        QList<IPlugin *> foundPlugins;
+        const QList<DusemtPluginPair> &plugins = dusemtPlugins();
+        foreach (const DusemtPluginPair &pair, plugins)
+            if (dynamic_cast<T>(pair.first))
+                foundPlugins << pair.first;
+        return foundPlugins;
+    }
+
 protected:
     IPluginController();
 };
diff --git a/examples/uml/duse-mt/src/plugins/architecturerecoverycore/architecturerecoverycoreplugin.cpp b/examples/uml/duse-mt/src/plugins/architecturerecoverycore/architecturerecoverycoreplugin.cpp
index 62b1c8b5..54f7995c 100644
--- a/examples/uml/duse-mt/src/plugins/architecturerecoverycore/architecturerecoverycoreplugin.cpp
+++ b/examples/uml/duse-mt/src/plugins/architecturerecoverycore/architecturerecoverycoreplugin.cpp
@@ -40,6 +40,11 @@
 ****************************************************************************/
 #include "architecturerecoverycoreplugin.h"
 
+#include <QtCore/QDebug>
+
+#include <duseinterfaces/iplugincontroller.h>
+#include "iarchitecturerecoverybackend.h"
+
 ArchitectureRecoveryCorePlugin::ArchitectureRecoveryCorePlugin(QObject *parent) :
     DuSE::IPlugin(parent)
 {
@@ -48,6 +53,7 @@ ArchitectureRecoveryCorePlugin::ArchitectureRecoveryCorePlugin(QObject *parent)
 bool ArchitectureRecoveryCorePlugin::initialize(DuSE::ICore *core)
 {
     Q_UNUSED(core);
+    qDebug() << core->pluginController()->pluginsByType<IArchitectureRecoveryBackend *>();
     return true;
 }
 
diff --git a/examples/uml/duse-mt/src/plugins/architecturerecoverycore/iarchitecturerecoverybackend.h b/examples/uml/duse-mt/src/plugins/architecturerecoverycore/iarchitecturerecoverybackend.h
index b7f874bc..93e066b1 100644
--- a/examples/uml/duse-mt/src/plugins/architecturerecoverycore/iarchitecturerecoverybackend.h
+++ b/examples/uml/duse-mt/src/plugins/architecturerecoverycore/iarchitecturerecoverybackend.h
@@ -47,8 +47,8 @@ class IArchitectureRecoveryBackend
 {
 
 public:
-    virtual QObjectList components() const = 0;
-    virtual QObjectList connectors() const = 0;
+    virtual QObjectList components() = 0;
+    virtual QObjectList connectors() = 0;
 };
 
 #endif // IARCHITECTURERECOVERYBACKEND_H
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.cpp b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.cpp
deleted file mode 100644
index 10b6da63..00000000
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.cpp
+++ /dev/null
@@ -1,155 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2013 Sandro S. Andrade <sandroandrade@kde.org>
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the QtDuse module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia.  For licensing terms and
-** conditions see http://qt.digia.com/licensing.  For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Digia gives you certain additional
-** rights.  These rights are described in the Digia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#include "gccxmlarchitecturerecoverybackend.h"
-
-GccXmlArchitectureRecoveryBackend::GccXmlArchitectureRecoveryBackend(QDir *rootProjDir)
-{
-    _rootProjDir = rootProjDir;
-}
-
-GccXmlArchitectureRecoveryBackend::~GccXmlArchitectureRecoveryBackend()
-{
-}
-
-QObjectList GccXmlArchitectureRecoveryBackend::components()
-{
-    QList<QObject*> components;
-
-    QStringList headers = findFiles("*.h");
-    QStringList xmlFiles = generateXmlFiles(headers);
-
-
-    for (int i = 0; i < xmlFiles.size(); ++i) {
-
-        QString xmlFile = xmlFiles.at(i).toLocal8Bit().constData();
-
-        if (openXmlFile(_rootProjDir->absolutePath() + "/" + xmlFile)) {
-
-            QObject *component = extractComponent(xmlFile);
-            components.append(component);
-        }
-    }
-
-    return components;
-}
-
-
-QStringList GccXmlArchitectureRecoveryBackend::findFiles(const QString &name) {
-
-    return _rootProjDir->entryList(QStringList(name), QDir::Files | QDir::NoSymLinks);
-}
-
-
-QStringList GccXmlArchitectureRecoveryBackend::generateXmlFiles(const QStringList &codeFiles) {
-
-    for (int i = 0; i < codeFiles.size(); ++i) {
-
-        QString file = codeFiles.at(i).toLocal8Bit().constData();
-        QString fileDir = _rootProjDir->absolutePath() + "/" + file;
-        QString xmlFileDir = _rootProjDir->absolutePath() + "/" + file.replace(".h", ".xml");
-
-        QString command = "gccxml " + fileDir + " -fxml=" + xmlFileDir;
-
-        QProcess process;
-        process.start(command);
-        process.waitForFinished();
-    }
-
-    return _rootProjDir->entryList(QStringList("*.xml"), QDir::Files | QDir::NoSymLinks);
-}
-
-
-bool GccXmlArchitectureRecoveryBackend::openXmlFile(const QString &filePath) {
-
-    QFile *file = new QFile(filePath);
-
-    xml = new QXmlStreamReader(file);
-
-    if (!file->open(QIODevice::ReadOnly | QIODevice::Text)) {
-        return false;
-    }
-
-    return true;
-}
-
-
-QStringList GccXmlArchitectureRecoveryBackend::findConstructorsFromXml(const QString &className) {
-
-    QStringList constructors;
-
-    while (!xml->atEnd() && !xml->hasError()) {
-
-        QXmlStreamReader::TokenType token = xml->readNext();
-
-        if (token == QXmlStreamReader::StartDocument) {
-            continue;
-        }
-
-        if (token == QXmlStreamReader::StartElement) {
-
-            if (xml->name() == "Constructor") {
-                QXmlStreamAttributes attributes = xml->attributes();
-
-                QString attribute = attributes.value("demangled").toString();
-                if (attribute.contains(className + "::")) {
-                    constructors.append(attribute);
-                }
-            }
-        }
-    }
-
-    return constructors;
-}
-
-
-QObject* GccXmlArchitectureRecoveryBackend::extractComponent(QString xmlFile) {
-
-    QStringList constructors = findConstructorsFromXml(xmlFile.replace(".xml", ""));
-
-    QString expression = constructors.at(constructors.size() - 1).toLocal8Bit().constData();
-    QStringList elements = expression.split("::");
-    QString className = elements.at(1).toLocal8Bit().constData();
-
-    QObject *component = new QObject;
-    component->setObjectName(className);
-
-    return component;
-}
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.h b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.h
deleted file mode 100644
index 4b635bb9..00000000
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.h
+++ /dev/null
@@ -1,74 +0,0 @@
-/****************************************************************************
-**
-** Copyright (C) 2013 Sandro S. Andrade <sandroandrade@kde.org>
-** Contact: http://www.qt-project.org/legal
-**
-** This file is part of the QtDuse module of the Qt Toolkit.
-**
-** $QT_BEGIN_LICENSE:LGPL$
-** Commercial License Usage
-** Licensees holding valid commercial Qt licenses may use this file in
-** accordance with the commercial license agreement provided with the
-** Software or, alternatively, in accordance with the terms contained in
-** a written agreement between you and Digia.  For licensing terms and
-** conditions see http://qt.digia.com/licensing.  For further information
-** use the contact form at http://qt.digia.com/contact-us.
-**
-** GNU Lesser General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU Lesser
-** General Public License version 2.1 as published by the Free Software
-** Foundation and appearing in the file LICENSE.LGPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU Lesser General Public License version 2.1 requirements
-** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
-**
-** In addition, as a special exception, Digia gives you certain additional
-** rights.  These rights are described in the Digia Qt LGPL Exception
-** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
-**
-** GNU General Public License Usage
-** Alternatively, this file may be used under the terms of the GNU
-** General Public License version 3.0 as published by the Free Software
-** Foundation and appearing in the file LICENSE.GPL included in the
-** packaging of this file.  Please review the following information to
-** ensure the GNU General Public License version 3.0 requirements will be
-** met: http://www.gnu.org/copyleft/gpl.html.
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-#ifndef GCCXMLARCHITECTURERECOVERYBACKEND_H
-#define GCCXMLARCHITECTURERECOVERYBACKEND_H
-
-#include <architecturerecoverycore/iarchitecturerecoverybackend.h>
-
-#include <QDir>
-#include <QObjectList>
-#include <QProcess>
-#include <QStringList>
-#include <QXmlStreamReader>
-
-class GccXmlArchitectureRecoveryBackend : public IArchitectureRecoveryBackend
-{
-
-public:
-    GccXmlArchitectureRecoveryBackend(QDir *rootProjDir);
-    ~GccXmlArchitectureRecoveryBackend();
-
-    QObjectList components();
-
-private:
-    QStringList findFiles(const QString &name);
-    QStringList generateXmlFiles(const QStringList &codeFiles);
-    bool openXmlFile(const QString &filePath);
-    QStringList findConstructorsFromXml(const QString &className);
-    QObject* extractComponent(QString xmlFile);
-
-private:
-    QDir *_rootProjDir;
-    QXmlStreamReader *xml;
-};
-
-#endif // GCCXMLARCHITECTURERECOVERYBACKEND_H
-
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.json b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.json
index 24b56a79..1952997f 100644
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.json
+++ b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.json
@@ -1,5 +1,8 @@
 {
     "Category": "Architecture Recovery",
     "Vendor": "Qt Project",
-    "Version": "1.0"
+    "Version": "1.0",
+    "DependencyList": [
+        "ArchitectureRecoveryCorePlugin"
+    ]
 }
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.pro b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.pro
index 55d814eb..de6fc963 100644
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.pro
+++ b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackend.pro
@@ -6,10 +6,8 @@
 
 include(../../duse-mt-plugin.pri)
 
-HEADERS += gccxmlarchitecturerecoverybackendplugin.h \
-           gccxmlarchitecturerecoverybackend.h
+HEADERS += gccxmlarchitecturerecoverybackendplugin.h
 
-SOURCES += gccxmlarchitecturerecoverybackendplugin.cpp \
-           gccxmlarchitecturerecoverybackend.cpp
+SOURCES += gccxmlarchitecturerecoverybackendplugin.cpp
 
 OTHER_FILES += gccxmlarchitecturerecoverybackend.json
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.cpp b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.cpp
index 4ef5a24f..0c733509 100644
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.cpp
+++ b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.cpp
@@ -51,3 +51,118 @@ bool GccXmlArchitectureRecoveryBackendPlugin::initialize(DuSE::ICore *core)
     return true;
 }
 
+void GccXmlArchitectureRecoveryBackendPlugin::setRootProjectDir(const QDir &rootProjectDir)
+{
+    this->rootProjectDir = rootProjectDir;
+}
+
+QObjectList GccXmlArchitectureRecoveryBackendPlugin::components()
+{
+    QList<QObject*> components;
+
+    QStringList headers = findFiles("*.h");
+    QStringList xmlFiles = generateXmlFiles(headers);
+
+
+    for (int i = 0; i < xmlFiles.size(); ++i) {
+
+        QString xmlFile = xmlFiles.at(i).toLocal8Bit().constData();
+
+        if (openXmlFile(rootProjectDir.absolutePath() + "/" + xmlFile)) {
+
+            QObject *component = extractComponent(xmlFile);
+            components.append(component);
+        }
+    }
+
+    return components;
+}
+
+QObjectList GccXmlArchitectureRecoveryBackendPlugin::connectors()
+{
+    return QObjectList();
+}
+
+QStringList GccXmlArchitectureRecoveryBackendPlugin::findFiles(const QString &name) const
+{
+
+    return rootProjectDir.entryList(QStringList(name), QDir::Files | QDir::NoSymLinks);
+}
+
+
+QStringList GccXmlArchitectureRecoveryBackendPlugin::generateXmlFiles(const QStringList &codeFiles) const
+{
+
+    for (int i = 0; i < codeFiles.size(); ++i) {
+
+        QString file = codeFiles.at(i).toLocal8Bit().constData();
+        QString fileDir = rootProjectDir.absolutePath() + "/" + file;
+        QString xmlFileDir = rootProjectDir.absolutePath() + "/" + file.replace(".h", ".xml");
+
+        QString command = "gccxml " + fileDir + " -fxml=" + xmlFileDir;
+
+        QProcess process;
+        process.start(command);
+        process.waitForFinished();
+    }
+
+    return rootProjectDir.entryList(QStringList("*.xml"), QDir::Files | QDir::NoSymLinks);
+}
+
+bool GccXmlArchitectureRecoveryBackendPlugin::openXmlFile(const QString &filePath)
+{
+
+    QFile *file = new QFile(filePath);
+
+    xml = new QXmlStreamReader(file);
+
+    if (!file->open(QIODevice::ReadOnly | QIODevice::Text)) {
+        return false;
+    }
+
+    return true;
+}
+
+QStringList GccXmlArchitectureRecoveryBackendPlugin::findConstructorsFromXml(const QString &className)
+{
+    QStringList constructors;
+
+    while (!xml->atEnd() && !xml->hasError()) {
+
+        QXmlStreamReader::TokenType token = xml->readNext();
+
+        if (token == QXmlStreamReader::StartDocument) {
+            continue;
+        }
+
+        if (token == QXmlStreamReader::StartElement) {
+
+            if (xml->name() == "Constructor") {
+                QXmlStreamAttributes attributes = xml->attributes();
+
+                QString attribute = attributes.value("demangled").toString();
+                if (attribute.contains(className + "::")) {
+                    constructors.append(attribute);
+                }
+            }
+        }
+    }
+
+    return constructors;
+}
+
+QObject *GccXmlArchitectureRecoveryBackendPlugin::extractComponent(QString xmlFile)
+{
+
+    QStringList constructors = findConstructorsFromXml(xmlFile.replace(".xml", ""));
+
+    QString expression = constructors.at(constructors.size() - 1).toLocal8Bit().constData();
+    QStringList elements = expression.split("::");
+    QString className = elements.at(1).toLocal8Bit().constData();
+
+    QObject *component = new QObject;
+    component->setObjectName(className);
+
+    return component;
+}
+
diff --git a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.h b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.h
index f57e8c37..c09f679a 100644
--- a/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.h
+++ b/examples/uml/duse-mt/src/plugins/gccxmlarchitecturerecoverybackend/gccxmlarchitecturerecoverybackendplugin.h
@@ -42,8 +42,15 @@
 #define GCCXMLARCHITECTURERECOVERYBACKENDPLUGIN_H
 
 #include <duseinterfaces/iplugin.h>
+#include <architecturerecoverycore/iarchitecturerecoverybackend.h>
 
-class GccXmlArchitectureRecoveryBackendPlugin : public DuSE::IPlugin
+#include <QDir>
+#include <QProcess>
+#include <QObjectList>
+#include <QStringList>
+#include <QXmlStreamReader>
+
+class GccXmlArchitectureRecoveryBackendPlugin : public DuSE::IPlugin, public IArchitectureRecoveryBackend
 {
     Q_OBJECT
     Q_PLUGIN_METADATA(IID "org.liveblue.DuSE.IPlugin" FILE "gccxmlarchitecturerecoverybackend.json")
@@ -52,6 +59,21 @@ public:
     GccXmlArchitectureRecoveryBackendPlugin(QObject *parent = 0);
 
     virtual bool initialize(DuSE::ICore *core);
+
+    void setRootProjectDir(const QDir &rootProjectDir);
+
+    virtual QObjectList components();
+    virtual QObjectList connectors();
+
+private:
+    QStringList findFiles(const QString &name) const;
+    QStringList generateXmlFiles(const QStringList &codeFiles) const;
+    bool openXmlFile(const QString &filePath);
+    QStringList findConstructorsFromXml(const QString &className);
+    QObject *extractComponent(QString xmlFile);
+
+    QDir rootProjectDir;
+    QXmlStreamReader *xml;
 };
 
 #endif // GCCXMLARCHITECTURERECOVERYBACKENDPLUGIN