Added UnknownResourceProvider class

The UnknownResourceProvider class is a dummy provider used as fallback
when an unknown ResourceProvider has been specified.

include/UnknownResourceProvider.h

@@ -0,0 +1,74 @@
+/*
+ * UnknownResourceProvider.h - header file for UnknownResourceProvider
+ *
+ * Copyright (c) 2010 Tobias Doerffel <tobydox/at/users.sourceforge.net>
+ *
+ * This file is part of Linux MultiMedia Studio - http://lmms.sourceforge.net
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef _UNKNOWN_RESOURCE_PROVIDER_H
+#define _UNKNOWN_RESOURCE_PROVIDER_H
+
+#include "ResourceProvider.h"
+
+
+/*! \brief The UnknownResourceProvider class is a dummy provider used as
+ * fallback when an unknown ResourceProvider has been specified.
+ */
+
+class UnknownResourceProvider : public ResourceProvider
+{
+public:
+	UnknownResourceProvider( const QString & url ) :
+		ResourceProvider( url )
+	{
+	}
+
+	virtual ~UnknownResourceProvider()
+	{
+	}
+
+	virtual QString providerName() const
+	{
+		return "UnknownResourceProvider";
+	}
+
+	virtual void updateDatabase()
+	{
+	}
+
+	virtual int dataSize( const ResourceItem * ) const
+	{
+		return 0;
+	}
+
+	virtual QByteArray fetchData( const ResourceItem *, int = -1 ) const
+	{
+		return QByteArray();
+	}
+
+	virtual bool isLocal() const
+	{
+		return true;
+	}
+
+} ;
+
+
+#endif