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diff --git a/libkcal/calendar.h b/libkcal/calendar.h
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+++ b/libkcal/calendar.h
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+/*
+    This file is part of libkcal.
+    Copyright (c) 1998 Preston Brown
+    Copyright (c) 2001 Cornelius Schumacher <schumacher@kde.org>
+
+    This library 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 library 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 library; see the file COPYING.LIB.  If not, write to
+    the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+    Boston, MA 02111-1307, USA.
+*/
+
+#ifndef CALENDAR_H
+#define CALENDAR_H
+
+#include <qobject.h>
+#include <qstring.h>
+#include <qdatetime.h>
+#include <qptrlist.h>
+#include <qdict.h>
+
+#include "customproperties.h"
+#include "event.h"
+#include "todo.h"
+#include "journal.h"
+
+#define _TIME_ZONE "-0500" /* hardcoded, overridden in config file. */
+
+class KConfig;
+
+namespace KCal {
+
+class CalFilter;
+
+/**
+  This is the main "calendar" object class for KOrganizer.  It holds
+  information like all appointments/events, user information, etc. etc.
+  one calendar is associated with each CalendarView (@see calendarview.h).
+  This is an abstract base class defining the interface to a calendar. It is
+  implemented by subclasses like @see CalendarLocal, which use different
+  methods to store and access the data.
+
+  Ownership of events etc. is handled by the following policy: As soon as an
+  event (or any other subclass of IncidenceBase) object is added to the
+  Calendar by addEvent() it is owned by the Calendar object. The Calendar takes
+  care of deleting it. All Events returned by the query functions are returned
+  as pointers, that means all changes to the returned events are immediately
+  visible in the Calendar. You shouldn't delete any Event object you get from
+  Calendar.
+*/
+class Calendar : public QObject, public CustomProperties,
+                 public IncidenceBase::Observer
+{
+    Q_OBJECT
+public:
+    Calendar();
+    Calendar(const QString &timeZoneId);
+    virtual ~Calendar();
+    void deleteIncidence(Incidence *in);
+    /**
+      Clears out the current calendar, freeing all used memory etc.
+    */
+    virtual void close() = 0;
+  
+    /**
+      Sync changes in memory to persistant storage.
+    */
+    virtual void save() = 0;
+
+    virtual bool isSaving() { return false; }
+
+    /**
+      Return the owner of the calendar's full name.
+    */
+    const QString &getOwner() const;
+    /**
+      Set the owner of the calendar. Should be owner's full name.
+    */
+    void setOwner( const QString &os );
+    /**
+      Return the email address of the calendar owner.
+    */
+    const QString &getEmail();
+    /**
+      Set the email address of the calendar owner.
+    */
+    void setEmail( const QString & );
+  
+    /**
+      Set time zone from a timezone string (e.g. -2:00)
+    */
+    void setTimeZone( const QString &tz );
+    /**
+      Set time zone from a minutes value (e.g. -60)
+    */
+    void setTimeZone( int tz );
+    /**
+      Return time zone as offest in minutes.
+    */
+    int getTimeZone() const;
+    /**
+      Compute an ISO 8601 format string from the time zone.
+    */
+    QString getTimeZoneStr() const;
+    /**
+      Set time zone id (see /usr/share/zoneinfo/zone.tab for list of legal
+      values).
+    */
+    void setTimeZoneId( const QString & );
+    /**
+      Return time zone id.
+    */
+    QString timeZoneId() const;
+    /**
+      Use local time, not UTC or a time zone.
+    */
+    void setLocalTime();
+    /**
+      Return whether local time is being used.
+    */
+    bool isLocalTime() const;
+  
+    /**
+      Add an incidence to calendar.
+      
+      @return true on success, false on error.
+    */
+    virtual bool addIncidence( Incidence * );  
+    /**
+      Return filtered list of all incidences of this calendar.
+    */
+    virtual QPtrList<Incidence> incidences();
+
+    /**
+      Return unfiltered list of all incidences of this calendar.
+    */
+    virtual QPtrList<Incidence> rawIncidences();
+
+    /**
+      Adds a Event to this calendar object.
+      @param anEvent a pointer to the event to add
+      
+      @return true on success, false on error.
+    */
+    virtual bool addEventNoDup( Event *event ) = 0;
+    virtual bool addEvent( Event *anEvent ) = 0;
+    /**
+      Delete event from calendar.
+    */
+    virtual void deleteEvent( Event * ) = 0;
+    /**
+      Retrieves an event on the basis of the unique string ID.
+    */
+    virtual Event *event( const QString &UniqueStr ) = 0;
+    virtual Event *event( int ) = 0;
+    /**
+      Builds and then returns a list of all events that match for the
+      date specified. useful for dayView, etc. etc.
+      The calendar filter is applied.
+    */
+    QPtrList<Event> events( const QDate &date, bool sorted = false);
+    /**
+      Get events, which occur on the given date.
+      The calendar filter is applied.
+    */
+    QPtrList<Event> events( const QDateTime &qdt );
+    /**
+      Get events in a range of dates. If inclusive is set to true, only events
+      are returned, which are completely included in the range.
+      The calendar filter is applied.
+    */
+    QPtrList<Event> events( const QDate &start, const QDate &end,
+                            bool inclusive = false);
+    /**
+      Return filtered list of all events in calendar.
+    */
+    virtual QPtrList<Event> events();
+    /**
+      Return unfiltered list of all events in calendar.
+    */
+    virtual QPtrList<Event> rawEvents() = 0;
+
+    /**
+      Add a todo to the todolist.
+      
+      @return true on success, false on error.
+    */
+    virtual bool addTodo( Todo *todo ) = 0;
+    virtual bool addTodoNoDup( Todo *todo ) = 0;
+    /**
+      Remove a todo from the todolist.
+    */
+    virtual void deleteTodo( Todo * ) = 0;
+    virtual void deleteJournal( Journal * ) = 0;
+    /**
+      Return filterd list of todos.
+    */
+    virtual QPtrList<Todo> todos();
+    /**
+      Searches todolist for an event with this unique string identifier,
+      returns a pointer or null.
+    */
+    virtual Todo *todo( const QString &uid ) = 0;
+    virtual Todo *todo( int ) = 0;
+    /**
+      Returns list of todos due on the specified date.
+    */
+    virtual QPtrList<Todo> todos( const QDate &date ) = 0;
+    /**
+      Return unfiltered list of todos.
+    */
+    virtual QPtrList<Todo> rawTodos() = 0;
+
+    /**
+      Add a Journal entry to calendar.
+      
+      @return true on success, false on error.
+    */
+    virtual bool addJournal( Journal * ) = 0;
+    /**
+      Return Journal for given date.
+    */
+    virtual Journal *journal( const QDate & ) = 0;
+    /**
+      Return Journal with given UID.
+    */
+    virtual Journal *journal( const QString &UID ) = 0;
+    /**
+      Return list of all Journal entries.
+    */
+    virtual QPtrList<Journal> journals() = 0;
+
+    /**
+      Searches all incidence types for an incidence with this unique
+      string identifier, returns a pointer or null.
+    */
+    Incidence* incidence( const QString&UID );
+
+    /**
+      Setup relations for an incidence.
+    */
+    virtual void setupRelations( Incidence * );
+    /**
+      Remove all relations to an incidence
+    */
+    virtual void removeRelations( Incidence * );
+    
+    /**
+      Set calendar filter, which filters events for the events() functions.
+      The Filter object is owned by the caller.
+    */
+    void setFilter( CalFilter * );
+    /**
+      Return calendar filter.
+    */
+    CalFilter *filter();
+    virtual QDateTime  nextAlarm(  int daysTo ) = 0;
+    virtual QString  nextSummary( ) const  = 0;
+    virtual void reInitAlarmSettings() = 0;
+    virtual QDateTime nextAlarmEventDateTime()  const = 0;
+    virtual void  checkAlarmForIncidence( Incidence *, bool )  = 0;
+    /**
+      Return all alarms, which ocur in the given time interval.
+    */
+    virtual Alarm::List alarms( const QDateTime &from,
+                                const QDateTime &to ) = 0;
+
+    class Observer {
+    public:
+        virtual void calendarModified( bool, Calendar * ) = 0;
+    };
+  
+    void registerObserver( Observer * );
+
+    void setModified( bool );
+
+    /**
+      Set product id returned by loadedProductId(). This function is only
+      useful for the calendar loading code.
+    */
+    void setLoadedProductId( const QString & );
+    /**
+      Return product id taken from file that has been loaded. Returns
+      QString::null, if no calendar has been loaded.
+    */
+    QString loadedProductId();
+
+  signals:
+    void calendarChanged();
+    void calendarSaved();
+    void calendarLoaded();
+    void addAlarm(const QDateTime &qdt, const QString &noti  );
+    void removeAlarm(const QDateTime &qdt, const QString &noti  );
+
+  protected:
+    /**
+      Get unfiltered events, which occur on the given date.
+    */
+    virtual QPtrList<Event> rawEventsForDate( const QDateTime &qdt ) = 0;
+    /**
+      Get unfiltered events, which occur on the given date.
+    */
+    virtual QPtrList<Event> rawEventsForDate( const QDate &date,
+                                              bool sorted = false ) = 0;  
+    /**
+      Get events in a range of dates. If inclusive is set to true, only events
+      are returned, which are completely included in the range.
+    */
+    virtual QPtrList<Event> rawEvents( const QDate &start, const QDate &end,
+                                       bool inclusive = false ) = 0; 
+    Incidence *mNextAlarmIncidence;
+
+private:
+    void init();
+  
+    QString mOwner;        // who the calendar belongs to
+    QString mOwnerEmail;   // email address of the owner
+    int mTimeZone;         // timezone OFFSET from GMT (MINUTES)
+    bool mLocalTime;       // use local time, not UTC or a time zone
+
+    CalFilter *mFilter;
+    CalFilter *mDefaultFilter;
+    
+    QString mTimeZoneId;
+
+    Observer *mObserver;
+    bool mNewObserver;
+    
+    bool mModified;
+
+    QString mLoadedProductId;
+
+    // This list is used to put together related todos
+    QDict<Incidence> mOrphans;
+    QDict<Incidence> mOrphanUids;
+};
+  
+}
+
+#endif