Marsyas  0.6.0-alpha
/usr/src/RPM/BUILD/marsyas-0.6.0/src/marsyas/sched/EvExpr.h
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00001 /*
00002 ** Copyright (C) 1998-2005 George Tzanetakis <gtzan@cs.uvic.ca>
00003 **
00004 ** This program is free software; you can redistribute it and/or modify
00005 ** it under the terms of the GNU General Public License as published by
00006 ** the Free Software Foundation; either version 2 of the License, or
00007 ** (at your option) any later version.
00008 **
00009 ** This program is distributed in the hope that it will be useful,
00010 ** but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 ** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 ** GNU General Public License for more details.
00013 **
00014 ** You should have received a copy of the GNU General Public License
00015 ** along with this program; if not, write to the Free Software
00016 ** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 */
00018 
00019 #ifndef MARSYAS_EV_EXPR_H
00020 #define MARSYAS_EV_EXPR_H
00021 
00022 #include <marsyas/sched/EvEvent.h>
00023 #include <marsyas/sched/TmControlValue.h>
00024 #include <marsyas/expr/Expr.h>
00025 #include <marsyas/system/MarControl.h>
00026 
00027 #include <string>
00028 #include <iostream>
00029 
00030 namespace Marsyas
00031 {
00041 class MarSystem; // forward declaration
00042 class Scheduler;
00043 
00044 class EvExpr : public EvEvent {
00045 protected:
00046   Scheduler* sched_;
00047   MarSystem* target_;
00048   Expr* expr_;
00049 
00050 public:
00051   EvExpr(MarSystem* target, std::string e, std::string nm="Expr");
00052   EvExpr(MarSystem* target, Ex e, Rp r, std::string nm="Expr");
00053   EvExpr(MarSystem* target, ExFile ef, std::string nm="Expr");
00054   virtual ~EvExpr();
00055 
00056   void setTimer(TmTimer* t);
00057 
00058   // Event dispatch
00059   void dispatch();
00060   void updctrl(std::string cname, TmControlValue value);
00061 
00062   virtual EvExpr* clone();
00063   Expr* getExpression() { return expr_; }
00064 
00065   virtual bool repeat();
00066   virtual std::string repeat_interval();
00067   virtual void set_repeat(Repeat r) { repeat_=r; }
00068 
00069   // the usual stream IO
00070   friend std::ostream& operator<<(std::ostream&, EvEvent&);
00071   friend std::istream& operator>>(std::istream&, EvEvent&);
00072 };
00073 
00074 }//namespace Marsyas
00075 
00076 #endif