Move the uninstallation calculations into UninstallerCalculator

Change-Id: I1b398815414430c2fab9a5c611b44e3a92c2fb39
Reviewed-by: Jarek Kobus <jaroslaw.kobus@digia.com>

1 files changed, 158 insertions, 0 deletions

diff --git a/src/libs/installer/uninstallercalculator.cpp b/src/libs/installer/uninstallercalculator.cpp
new file mode 100644
index 000000000..0266bbb06
--- /dev/null
+++ b/src/libs/installer/uninstallercalculator.cpp
@@ -0,0 +1,158 @@
+/**************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Installer Framework.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 "uninstallercalculator.h"
+
+#include "component.h"
+#include "packagemanagercore.h"
+#include "globals.h"
+
+#include <QDebug>
+
+namespace QInstaller {
+
+UninstallerCalculator::UninstallerCalculator(const QList<Component *> &installedComponents)
+    : m_installedComponents(installedComponents)
+{
+}
+
+QSet<Component *> UninstallerCalculator::componentsToUninstall() const
+{
+    return m_componentsToUninstall;
+}
+
+bool UninstallerCalculator::appendComponentToUninstall(Component *component)
+{
+    if (!component)
+        return false;
+
+    PackageManagerCore *core = component->packageManagerCore();
+    // remove all already resolved dependees
+    QSet<Component *> dependees = core->dependees(component).toSet()
+            .subtract(m_componentsToUninstall);
+    if (dependees.isEmpty()) {
+        component->setCheckState(Qt::Unchecked);
+        m_componentsToUninstall.insert(component);
+        return true;
+    }
+
+    QSet<Component *> dependeesToResolve;
+    foreach (Component *dependee, dependees) {
+        if (dependee->isInstalled()) {
+            // keep them as already resolved
+            dependee->setCheckState(Qt::Unchecked);
+            m_componentsToUninstall.insert(dependee);
+            // gather possible dependees, keep them to resolve it later
+            dependeesToResolve.unite(core->dependees(dependee).toSet());
+        }
+    }
+
+    bool allResolved = true;
+    foreach (Component *dependee, dependeesToResolve)
+        allResolved &= appendComponentToUninstall(dependee);
+
+    return allResolved;
+}
+
+bool UninstallerCalculator::appendComponentsToUninstall(const QList<Component*> &components)
+{
+    if (components.isEmpty()) {
+        qDebug() << "components list is empty in" << Q_FUNC_INFO;
+        return true;
+    }
+
+    bool allResolved = true;
+    foreach (Component *component, components) {
+        if (component->isInstalled()) {
+            component->setCheckState(Qt::Unchecked);
+            m_componentsToUninstall.insert(component);
+            allResolved &= appendComponentToUninstall(component);
+        }
+    }
+
+    QList<Component*> autoDependOnList;
+    if (allResolved) {
+        // All regular dependees are resolved. Now we are looking for auto depend on components.
+        foreach (Component *component, m_installedComponents) {
+            // If a components is installed and not yet scheduled for un-installation, check for auto depend.
+            if (component->isInstalled() && !m_componentsToUninstall.contains(component)) {
+                QStringList autoDependencies = component->autoDependencies();
+                if (autoDependencies.isEmpty())
+                    continue;
+
+                // This code needs to be enabled once the scripts use isInstalled, installationRequested and
+                // uninstallationRequested...
+                if (autoDependencies.first().compare(QLatin1String("script"), Qt::CaseInsensitive) == 0) {
+                    //QScriptValue valueFromScript;
+                    //try {
+                    //    valueFromScript = callScriptMethod(QLatin1String("isAutoDependOn"));
+                    //} catch (const Error &error) {
+                    //    // keep the component, should do no harm
+                    //    continue;
+                    //}
+
+                    //if (valueFromScript.isValid() && !valueFromScript.toBool())
+                    //    autoDependOnList.append(component);
+                    continue;
+                }
+
+                foreach (Component *c, m_installedComponents) {
+                    const QString replaces = c->value(scReplaces);
+                    const QStringList possibleNames = replaces.split(QInstaller::commaRegExp(),
+                        QString::SkipEmptyParts) << c->name();
+                    foreach (const QString &possibleName, possibleNames)
+                        autoDependencies.removeAll(possibleName);
+                }
+
+                // A component requested auto installation, keep it to resolve their dependencies as well.
+                if (!autoDependencies.isEmpty())
+                    autoDependOnList.append(component);
+            }
+        }
+    }
+
+    if (!autoDependOnList.isEmpty())
+        return appendComponentsToUninstall(autoDependOnList);
+    return allResolved;
+}
+
+
+} // namespace QInstaller