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123 lines
3.5 KiB
123 lines
3.5 KiB
/*
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Copyright (c) 2009 Kevin Krammer <kevin.krammer@gmx.at>
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This library is free software; you can redistribute it and/or modify it
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under the terms of the GNU Library General Public License as published by
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the Free Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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This library is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
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License for more details.
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You should have received a copy of the GNU Library General Public License
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along with this library; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA.
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*/
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#ifndef KCAL_ASSIGNMENTVISITOR_H
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#define KCAL_ASSIGNMENTVISITOR_H
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#include "incidencebase.h"
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namespace KCal {
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/**
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Helper for type correct assignment of incidences via pointers.
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This class provides a way of correctly assigning one incidence to another,
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given two IncidenceBase derived pointers. It effectively provides a virtual
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assignment method which first type checks the two pointers to ensure they
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reference the same incidence type, before performing the assignment.
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Usage example:
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@code
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KCal::Incidence *currentIncidence; // assume this is set somewhere else
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KCal::Incidence *updatedIncidence; // assume this is set somewhere else
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KCal::AssignmentVisitor visitor;
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// assign
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if ( !visitor.assign(currentIncidence, updatedIncidence) ) {
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// not of same type
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}
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@endcode
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@author Kevin Krammer \<kevin.krammer@gmx.at\>
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*/
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class AssignmentVisitor : public IncidenceBase::Visitor
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{
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public:
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/**
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Creates a visitor instance.
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*/
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AssignmentVisitor();
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/**
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Destroys the instance.
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*/
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virtual ~AssignmentVisitor();
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/**
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Assigns the incidence referenced by @p source to the incidence referenced
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by @p target, first ensuring that the @p source incidence can be cast to
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the same class as the @p target incidence.
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Basically it is a virtual equivalent of
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@code
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*target = *source
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@endcode
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@param target pointer to the instance to assign to
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@param source pointer to the instance to assign from
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@return @c false if the two objects are of different type
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*/
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bool assign( IncidenceBase *target, const IncidenceBase *source );
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/**
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Tries to assign to the given @p event, using the source passed to
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assign().
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@return @c false if the source passed to assign() is not an Event
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*/
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virtual bool visit( Event *event );
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/**
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Tries to assign to the given @p todo, using the source passed to
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assign().
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@return @c false if the source passed to assign() is not a Todo
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*/
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virtual bool visit( Todo *todo );
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/**
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Tries to assign to the given @p journal, using the source passed to
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assign().
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@return @c false if the source passed to assign() is not a Journal
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*/
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virtual bool visit( Journal *journal );
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/**
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Tries to assign to the given @p freebusy, using the source passed to
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assign().
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@return @c false if the source passed to assign() is not a FreeBusy
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*/
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virtual bool visit( FreeBusy *freebusy );
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private:
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//@cond PRIVATE
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class Private;
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Private *const d;
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//@endcond
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};
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}
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#endif
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// kate: space-indent on; indent-width 2; tqreplace-tabs on;
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