1 files changed, 129 insertions, 0 deletions
diff --git a/include/cosv/tpl/processor.hxx b/include/cosv/tpl/processor.hxx
new file mode 100644
index 000000000000..a685acd5bed6
--- /dev/null
+++ b/include/cosv/tpl/processor.hxx
@@ -0,0 +1,129 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef CSV_TPL_PROCESSOR_HXX
+#define CSV_TPL_PROCESSOR_HXX
+
+// USED SERVICES
+
+
+
+
+namespace csv
+{
+
+
+/** Implements an acyclic visitor pattern. This is the abstract
+    base for the classes doing the work (the "visitors").
+*/
+class ProcessorIfc
+{
+  public:
+    virtual             ~ProcessorIfc() {}
+};
+
+
+
+/** Implements an acyclic visitor pattern. This is the abstract
+    base for the classes to be processed (the "visitables").
+*/
+class ConstProcessorClient
+{
+  public:
+    virtual             ~ConstProcessorClient() {}
+
+    void                Accept(
+                            ProcessorIfc &  io_processor ) const
+                            { do_Accept(io_processor); }
+  private:
+    virtual void        do_Accept(
+                            ProcessorIfc &  io_processor ) const = 0;
+};
+
+
+/** Typed base for "visitor" classes, leaving the visited
+    object const.
+
+    @see ProcessorIfc
+    @see Processor<>
+*/
+template <typename X, typename R = void>
+class ConstProcessor
+{
+  public:
+    virtual             ~ConstProcessor() {}
+
+    R                   Process(
+                            const X &           i_object )
+                        { return do_Process(i_object ); }
+ private:
+    virtual R           do_Process(
+                            const X &           i_object ) = 0;
+};
+
+
+/** Typed base for "visitor" classes which may change the visited
+    object.
+
+    @see ProcessorIfc
+    @see ConstProcessor<>
+*/
+template <typename X, typename R = void>
+class Processor
+{
+  public:
+    virtual             ~Processor() {}
+
+    R                   Process(
+                            X &                 i_object )
+                        { return do_Process(i_object ); }
+ private:
+    virtual R           do_Process(
+                            X &                 i_object ) = 0;
+};
+
+
+template <class C>
+inline void
+CheckedCall( ProcessorIfc &  io_processor,
+             const C &       i_client )
+{
+    ConstProcessor<C> *
+        pProcessor = dynamic_cast< csv::ConstProcessor<C> * >
+                        (&io_processor);
+    if (pProcessor != 0)
+        pProcessor->Process(i_client);
+}
+
+template <class C>
+inline void
+CheckedCall( ProcessorIfc &  io_processor,
+             C &             io_client )
+{
+    Processor<C> *
+        pProcessor = dynamic_cast< csv::Processor<C> * >
+                        (&io_processor);
+    if (pProcessor != 0)
+        pProcessor->Process(io_client);
+}
+
+}   // namespace csv
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */