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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the qt3to4 porting application of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef LOGGER_H
+#define LOGGER_H
+
+#include <QString>
+#include <QStringList>
+#include <QList>
+#include <QMap>
+
+QT_BEGIN_NAMESPACE
+/*
+    Base class for logger entries;
+    description() should return a text for this entry,
+*/
+class LogEntry
+{
+public:
+    LogEntry(QString type, QString location);
+    virtual ~LogEntry(){};
+    virtual QString description() const =0;
+    virtual void updateLinePos(int threshold, int delta) {Q_UNUSED(threshold); Q_UNUSED(delta)};
+protected:
+    QString type; // Error, Warning, Info, etc
+    QString location;// preprocessor, c++parser, porting, etc
+};
+
+class PlainLogEntry: public LogEntry
+{
+public:
+     PlainLogEntry(QString type, QString lcation, QString text);
+     QString description() const {return text;};
+protected:
+     QString text;
+};
+
+/*
+    A log entry that stores a source point: file, line and column.
+*/
+class SourcePointLogEntry : public LogEntry
+{
+public:
+    SourcePointLogEntry(QString type, QString location, QString file, int line, int column, QString text);
+    QString description() const;
+    void updateLinePos(int threshold, int delta);
+protected:
+    QString file;
+    int line;
+    int column;
+    QString text;
+};
+
+
+class Logger
+{
+public:
+    Logger(){};
+    ~Logger();
+    static Logger *instance();
+    static void deleteInstance();
+
+    void beginSection();
+    void commitSection();
+    void revertSection();
+    void addEntry(LogEntry *entry);
+
+    QStringList fullReport();
+    int numEntries();
+    void updateLineNumbers(int insertLine, int numLines);
+    /*
+        glabalState can be used for storage of application state
+        together with the logger. This can be useful in some cases,
+        for example the current filename is stored here when processing
+        files.
+    */
+    QMap<QString, QString> globalState;
+private:
+    static Logger *theInstance;
+    QList<LogEntry*> logEntries;
+    QList<LogEntry*> pendingLogEntries;
+};
+
+QT_END_NAMESPACE
+
+#endif