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+/*
+ *   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; if not, write to the
+ *   Free Software Foundation, Inc.,
+ *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#ifndef _MH_EXECM_H_INCLUDED_
+#define _MH_EXECM_H_INCLUDED_
+/* @(#$Id: mh_exec.h,v 1.8 2008-10-06 06:22:46 dockes Exp $  (C) 2004 J.F.Dockes */
+
+#include "mh_exec.h"
+#include "execmd.h"
+
+/** 
+ * Turn external document into internal one by executing an external filter.
+ *
+ * The command to execute, and its parameters, are stored in the "params" 
+ * which is built in mimehandler.cpp out of data from the mimeconf file.
+ *
+ * This version uses persistent filters which can handle multiple requests 
+ * without exiting, with a simple question/response protocol.
+ *
+ * The data is exchanged in TLV fashion, in a way that should be
+ * usable in most script languages. The basic unit has one line with a
+ * data type and a count, followed by the data. A 'message' ends with
+ * one empty line. A possible exchange:
+ * 
+ * From recollindex (the message begins before 'Filename'):
+ * 
+Filename: 24
+/my/home/mail/somefolderIpath: 2
+22
+<Message ends here: because of the empty line after '22'
+ * 
+ * Example answer:
+ * 
+Mimetype: 10
+text/plainData: 10
+0123456789
+<Message ends here because of empty line
+ *        
+ * Until proven otherwise, this format is both extensible and
+ * reasonably easy to parse. While it's more destined for python or
+ * perl on the script side, it should even be sort of usable from the shell
+ * (ie: use dd to read the counted data). Most alternatives would need data
+ * encoding in some cases.
+ */
+class MimeHandlerExecMultiple : public MimeHandlerExec {
+    /////////
+    // Things not reset by "clear()", additionally to those in MimeHandlerExec
+    ExecCmd  m_cmd;
+    /////// End un-cleared stuff.
+
+ public:
+    MimeHandlerExecMultiple(const string& mt) 
+        : MimeHandlerExec(mt)
+    {}
+    // No resources to clean up, the ExecCmd destructor does it.
+    virtual ~MimeHandlerExecMultiple() {}
+    virtual bool next_document();
+    virtual void clear() {
+	MimeHandlerExec::clear(); 
+    }
+private:
+    bool startCmd();
+    bool readDataElement(string& name);
+};
+
+#endif /* _MH_EXECM_H_INCLUDED_ */