selector.h

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// -*- Mode: C++; tab-width: 2; -*-
// vi: set ts=2:
//
// $Id: selector.h,v 1.29 2005/10/23 12:02:20 oliver Exp $
//

#ifndef BALL_KERNEL_SELECTOR_H
#define BALL_KERNEL_SELECTOR_H

#ifndef BALL_KERNEL_EXPRESSION_H
# include <BALL/KERNEL/expression.h>
#endif


namespace BALL 
{
  class Atom;

  class BALL_EXPORT Selector
    : public UnaryProcessor<Composite>
  {
    
    public:
    

    // BALL_CREATE(Selector)

    Selector();

    Selector(const Selector& selector);

    Selector(const String& expression_string);

    virtual ~Selector();



    virtual void clear();

    Selector& operator = (const Selector& selector);



    bool operator == (const Selector& selector) const;



    virtual Processor::Result operator () (Composite& composite);
    
    virtual bool start();



    Size getNumberOfSelectedAtoms() const;

    std::list<Atom*>& getSelectedAtoms();
    
    void setExpression(const Expression& expression);

    const Expression& getExpression() const;
    
        
      
    protected:

    std::list<Atom*> selected_atoms_;
    Expression  expression_;
  };

} // namespace BALL

#endif // BALL_KERNEL_SELECTOR_H