/home/marsyas/marsyas/src/marsyas/EvExpr.h

/*
** Copyright (C) 1998-2005 George Tzanetakis <gtzan@cs.uvic.ca>
**  
** 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 MARSYAS_EV_EXPR_H
#define MARSYAS_EV_EXPR_H

#include <string>
#include <iostream>

#include "MarControl.h"
#include "EvEvent.h"
#include "TmControlValue.h"
#include "Expr.h"

namespace Marsyas
{
class MarSystem; // forward declaration
class Scheduler;

class EvExpr : public EvEvent {
protected:
    Scheduler* sched_;
    MarSystem* target_;
    Expr* expr_;

public:
    EvExpr(MarSystem* target, std::string e, std::string nm="Expr");
    EvExpr(MarSystem* target, Ex e, Rp r, std::string nm="Expr");
    EvExpr(MarSystem* target, ExFile ef, std::string nm="Expr");
    virtual ~EvExpr();

    void setTimer(TmTimer* t);

    // Event dispatch
    void dispatch();
    void updctrl(std::string cname, TmControlValue value);

    virtual EvExpr* clone();
    Expr* getExpression() { return expr_; }

    virtual bool repeat();
    virtual std::string repeat_interval();
    virtual void set_repeat(Repeat r) { repeat_=r; }

    // the usual stream IO
    friend std::ostream& operator<<(std::ostream&, EvEvent&);
    friend std::istream& operator>>(std::istream&, EvEvent&);
};

}//namespace Marsyas

#endif

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