1 files changed, 107 insertions, 0 deletions
diff --git a/libkcal/comparisonvisitor.cpp b/libkcal/comparisonvisitor.cpp
new file mode 100644
index 000000000..79a61e2fc
--- /dev/null
+++ b/libkcal/comparisonvisitor.cpp
@@ -0,0 +1,107 @@
+/*
+  Copyright 2009 Ingo Klöcker <kloecker@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., 51 Franklin Street, Fifth Floor, Boston, MA
+  02110-1301, USA.
+*/
+
+#include "comparisonvisitor.h"
+#include "event.h"
+#include "freebusy.h"
+#include "journal.h"
+#include "todo.h"
+
+using namespace KCal;
+
+class ComparisonVisitor::Private
+{
+  public:
+    Private() : mReference( 0 ) {}
+
+  public:
+    const IncidenceBase *mReference;
+};
+
+ComparisonVisitor::ComparisonVisitor() : d( new Private() )
+{
+}
+
+ComparisonVisitor::~ComparisonVisitor()
+{
+  delete d;
+}
+
+bool ComparisonVisitor::compare( IncidenceBase *incidence, const IncidenceBase *reference )
+{
+  d->mReference = reference;
+
+  const bool result = incidence ? incidence->accept( *this ) : reference == 0;
+
+  d->mReference = 0;
+
+  return result;
+}
+
+bool ComparisonVisitor::visit( Event *event )
+{
+  Q_ASSERT( event != 0 );
+
+  const Event *refEvent = dynamic_cast<const Event*>( d->mReference );
+  if ( refEvent ) {
+    return *event == *refEvent;
+  } else {
+    // refEvent is no Event and thus cannot be equal to event
+    return false;
+  }
+}
+
+bool ComparisonVisitor::visit( Todo *todo )
+{
+  Q_ASSERT( todo != 0 );
+
+  const Todo *refTodo = dynamic_cast<const Todo*>( d->mReference );
+  if ( refTodo ) {
+    return *todo == *refTodo;
+  } else {
+    // refTodo is no Todo and thus cannot be equal to todo
+    return false;
+  }
+}
+
+bool ComparisonVisitor::visit( Journal *journal )
+{
+  Q_ASSERT( journal != 0 );
+
+  const Journal *refJournal = dynamic_cast<const Journal*>( d->mReference );
+  if ( refJournal ) {
+    return *journal == *refJournal;
+  } else {
+    // refJournal is no Journal and thus cannot be equal to journal
+    return false;
+  }
+}
+
+bool ComparisonVisitor::visit( FreeBusy *freebusy )
+{
+  Q_ASSERT( freebusy != 0 );
+
+  const FreeBusy *refFreeBusy = dynamic_cast<const FreeBusy*>( d->mReference );
+  if ( refFreeBusy ) {
+    return *freebusy == *refFreeBusy;
+  } else {
+    // refFreeBusy is no FreeBusy and thus cannot be equal to freebusy
+    return false;
+  }
+}