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diff --git a/libkcal/incidencebase.h b/libkcal/incidencebase.h
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+/*
+    This file is part of libkcal.
+    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 KCAL_INCIDENCEBASE_H
+#define KCAL_INCIDENCEBASE_H
+//
+// Incidence - base class of calendaring components
+//
+
+#include <qdatetime.h>
+#include <qstringlist.h>
+#include <qvaluelist.h>
+#include <qptrlist.h>
+
+#include "customproperties.h"
+#include "attendee.h"
+
+namespace KCal {
+
+typedef QValueList<QDate> DateList;
+
+/**
+  This class provides the base class common to all calendar components.
+*/
+class IncidenceBase : public CustomProperties
+{
+  public:
+    class Observer {
+      public:
+        virtual void incidenceUpdated( IncidenceBase * ) = 0;
+    };
+
+    IncidenceBase();
+    IncidenceBase(const IncidenceBase &);
+    virtual ~IncidenceBase();
+
+    virtual QCString type() const = 0;
+
+    /** Set the unique id for the event */
+    void setUid(const QString &);
+    /** Return the unique id for the event */
+    QString uid() const;
+
+    /** Sets the time the incidence was last modified. */
+    void setLastModified(const QDateTime &lm);
+    /** Return the time the incidence was last modified. */
+    QDateTime lastModified() const;
+
+    /** sets the organizer for the event */
+    void setOrganizer(const QString &o);
+    QString organizer() const;
+
+    /** Set readonly status. */
+    virtual void setReadOnly( bool );
+    /** Return if the object is read-only. */
+    bool isReadOnly() const { return mReadOnly; }
+
+    /** for setting the event's starting date/time with a QDateTime. */
+    virtual void setDtStart(const QDateTime &dtStart);
+    /** returns an event's starting date/time as a QDateTime. */
+    QDateTime dtStart() const;
+    /** returns an event's starting time as a string formatted according to the
+     users locale settings */
+    QString dtStartTimeStr() const;
+    /** returns an event's starting date as a string formatted according to the
+     users locale settings */
+    QString dtStartDateStr(bool shortfmt=true) const;
+    /** returns an event's starting date and time as a string formatted according
+     to the users locale settings */
+    QString dtStartStr(bool shortfmt=true) const;
+
+    virtual void setDuration(int seconds);
+    int duration() const;
+    void setHasDuration(bool);
+    bool hasDuration() const;
+
+    /** Return true or false depending on whether the incidence "floats,"
+     * i.e. has a date but no time attached to it. */
+    bool doesFloat() const;
+    /** Set whether the incidence floats, i.e. has a date but no time attached to it. */
+    void setFloats(bool f);
+
+    /**
+      Add Attendee to this incidence. IncidenceBase takes ownership of the
+      Attendee object.
+    */
+    void addAttendee(Attendee *a, bool doupdate=true );
+//    void removeAttendee(Attendee *a);
+//    void removeAttendee(const char *n);
+    /** Remove all Attendees. */
+    void clearAttendees();
+    /** Return list of attendees. */
+    QPtrList<Attendee> attendees() const { return mAttendees; };
+    /** Return number of attendees. */
+    int attendeeCount() const { return mAttendees.count(); };
+    /** Return the Attendee with this email */
+    Attendee* attendeeByMail(const QString &);
+    /** Return first Attendee with one of this emails */
+    Attendee* attendeeByMails(const QStringList &, const QString& email = QString::null);
+
+    /** pilot syncronization states */
+    enum { SYNCNONE = 0, SYNCMOD = 1, SYNCDEL = 3 };
+    /** Set synchronisation satus. */
+    void setSyncStatus(int stat);
+    /** Return synchronisation status. */
+    int syncStatus() const;
+
+    /** Set Pilot Id. */
+    void setPilotId(int id);
+    /** Return Pilot Id. */
+    int pilotId() const;
+
+    void setZaurusId(int id);
+    int zaurusId() const;
+    void setZaurusUid(int id);
+    int zaurusUid() const;
+    void setZaurusStat(int id);
+    int zaurusStat() const;
+
+    void registerObserver( Observer * );
+    void unRegisterObserver( Observer * );
+    void updated();
+
+  protected:
+    bool mReadOnly;
+    QDateTime getEvenTime( QDateTime );
+
+  private:
+    // base components
+    QDateTime mDtStart;
+    QString mOrganizer;
+    QString mUid;
+    QDateTime mLastModified;
+    QPtrList<Attendee> mAttendees;
+
+    bool mFloats;
+
+    int mDuration;
+    bool mHasDuration;
+    int mZaurusId;
+    int mZaurusUid;
+    int mZaurusStat;
+
+    // PILOT SYNCHRONIZATION STUFF
+    int mPilotId;                         // unique id for pilot sync
+    int mSyncStatus;                      // status (for sync)
+
+    QPtrList<Observer> mObservers;
+};
+
+bool operator==( const IncidenceBase&, const IncidenceBase& );
+}
+
+#endif