classifier.h

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 * @(#) $Header: /nfs/jade/vint/CVSROOT/ns-2/classifier/classifier.h,v 1.33 2005/09/26 09:12:46 lacage Exp $ (LBL)
 */

#ifndef ns_classifier_h
#define ns_classifier_h

#include "object.h"

class Packet;

class Classifier : public NsObject {
public:
    Classifier();
    virtual ~Classifier();

    inline int maxslot() const { return maxslot_; }
    inline NsObject* slot(int slot) {
        if ((slot >= 0) && (slot < nslot_))
            return slot_[slot];
        return 0;
    }
    inline int mshift(int val) { return ((val >> shift_) & mask_); }
    inline void set_default_target(NsObject *obj) { 
        default_target_ = obj;
    }

    virtual void recv(Packet* p, Handler* h);
    virtual NsObject* find(Packet*);
    virtual int classify(Packet *);
    virtual void clear(int slot);
    enum classify_ret {ONCE= -2, TWICE= -1};
    
    virtual void do_install(char* dst, NsObject *target) {
        int slot = atoi(dst);
        install(slot, target); }
    int install_next(NsObject *node);
    virtual void install(int slot, NsObject*);

    // function to set the rtg table size
    void set_table_size(int nn);
    // hierarchical specific
    virtual void set_table_size(int level, int nn) {}

    int allocPort (NsObject *); 
protected:
    virtual int getnxt(NsObject *);
    virtual int command(int argc, const char*const* argv);
    void alloc(int);
    NsObject** slot_;   /* table that maps slot number to a NsObject */
    int nslot_;
    int maxslot_;
    int offset_;        // offset for Packet::access()
    int shift_;
    int mask_;
    NsObject *default_target_;
    int nsize_;       //what size of nslot_ should be
};

#endif

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