Add class factories for filter streams. Also filters now follow the convention

that they own their parent if they are created with a pointer to the parent.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@42412 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/filtfind.cpp

@@ -0,0 +1,43 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        src/common/filtfind.cpp
+// Purpose:     Streams for filter formats
+// Author:      Mike Wetherell
+// RCS-ID:      $Id$
+// Copyright:   (c) Mike Wetherell
+// Licence:     wxWindows licence
+/////////////////////////////////////////////////////////////////////////////
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#ifdef __BORLANDC__
+    #pragma hdrstop
+#endif
+
+#if wxUSE_STREAMS
+
+#include "wx/stream.h"
+
+// These functions are in a separate file so that statically linked apps
+// that do not call them to search for filter handlers will only link in
+// the filter classes they use.
+
+const wxFilterClassFactory *
+wxFilterClassFactory::Find(const wxChar *protocol, wxStreamProtocolType type)
+{
+    for (const wxFilterClassFactory *f = GetFirst(); f; f = f->GetNext())
+        if (f->CanHandle(protocol, type))
+            return f;
+
+    return NULL;
+}
+
+// static
+const wxFilterClassFactory *wxFilterClassFactory::GetFirst()
+{
+    if (!sm_first)
+        wxUseFilterClasses();
+    return sm_first;
+}
+
+#endif // wxUSE_STREAMS