1 files changed, 133 insertions, 0 deletions
diff --git a/libfrontend-elements/frontend-elements/context.hxx b/libfrontend-elements/frontend-elements/context.hxx
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+++ b/libfrontend-elements/frontend-elements/context.hxx
@@ -0,0 +1,133 @@
+// file      : frontend-elements/context.hxx
+// author    : Boris Kolpackov <boris@kolpackov.net>
+// copyright : Copyright (c) 2005-2010 Boris Kolpackov
+// license   : GNU GPL v2 + exceptions; see accompanying LICENSE file
+
+#ifndef FRONTEND_ELEMENTS_CONTEXT_HXX
+#define FRONTEND_ELEMENTS_CONTEXT_HXX
+
+#include <frontend-elements/types.hxx>
+
+#include <cult/containers/any.hxx>
+#include <cult/containers/map.hxx>
+
+namespace FrontendElements
+{
+  class Context: public NonCopyable
+  {
+    typedef
+    Cult::Containers::Map<String, Cult::Containers::Any>
+    Map;
+
+  public:
+    struct NoEntry {};
+    struct Typing {};
+
+    Context ()
+    {
+    }
+
+    Void
+    swap (Context& c)
+    {
+      map_.swap (c.map_);
+    }
+
+    Size
+    count (Char const* key) const
+    {
+      return map_.count (key);
+    }
+
+    template <typename X>
+    X&
+    get (Char const* key)
+    {
+      Map::Iterator i (map_.find (key));
+
+      if (i == map_.end ())
+        throw NoEntry ();
+
+      try
+      {
+        return i->second. template value<X> ();
+      }
+      catch (Cult::Containers::Any::Typing const&)
+      {
+        throw Typing ();
+      }
+    }
+
+    template <typename X>
+    X const&
+    get (Char const* key) const
+    {
+      Map::ConstIterator i (map_.find (key));
+
+      if (i == map_.end ())
+        throw NoEntry ();
+
+      try
+      {
+        return i->second. template value<X> ();
+      }
+      catch (Cult::Containers::Any::Typing const&)
+      {
+        throw Typing ();
+      }
+    }
+
+    template <typename X>
+    X const&
+    get (Char const* key, X const& default_value) const
+    {
+      Map::ConstIterator i (map_.find (key));
+
+      if (i == map_.end ())
+        return default_value;
+
+      try
+      {
+        return i->second. template value<X> ();
+      }
+      catch (Cult::Containers::Any::Typing const&)
+      {
+        throw Typing ();
+      }
+    }
+
+    template <typename X>
+    Void
+    set (Char const* key, X const& value)
+    {
+      try
+      {
+        if (!map_.insert (Map::Pair (key, value)).second)
+        {
+          Map::Iterator i (map_.find (key));
+          i->second.template value <X> () = value;
+        }
+      }
+      catch (Cult::Containers::Any::Typing const&)
+      {
+        throw Typing ();
+      }
+    }
+
+    Void
+    remove (Char const* key)
+    {
+      Map::Iterator i (map_.find (key));
+
+      if (i == map_.end ())
+        throw NoEntry ();
+
+      map_.erase (i);
+    }
+
+  private:
+    Map map_;
+  };
+}
+
+#endif  // FRONTEND_ELEMENTS_CONTEXT_HXX