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#ifndef CSCChannelMapperBase_H
#define CSCChannelMapperBase_H
/**
* \class CSCChannelMapperBase
*
* Base class for concrete CSCChannelMapper classes that
* map between raw/online channel numbers (for strips/cathodes and wires/anodes)
* and offline geometry-oriented channel numbers, in which increasing number
* corresponds to increasing local x (strips) or y (wire groups) as defined
* in CMS Note CMS IN-2007/024.
*
* The original of this class, CSCChannelTranslator, was written in the
* expectation that one day it would be replaced by a full "cable map" stored in
* conditions data. That has not yet been required and so the mappings are
* hard-coded.
*
* Concrete derived classes must implement the following: <BR>
* 1. Sort out any readout-flipping within the two endcaps for ME1a and ME1b
* strip channels. <BR>
* 2. If ME1a is ganged then map the ME1a channels from online labels 65-80 to
* offline 1-16. <BR>
* 3. Do nothing with wiregroup channels; the output = the input. <BR>
* (Historically some test beam data needed wiregroup remapping but this was
* embedded directly in the Unpacker of CSCRawToDigi. We want to move any such
* mappings into this class rather than have them scattered through the code.)
*
* Beware that if ME1a is ganged,the 48 strips in ME1a are fed to 16 channels,
* so it is important to distinguish the nomenclatures "strip" vs "channel". It
* is usually a meaningful distinction!
*
* Also note that the CSCDetId for ME11 and ME1b is identical. Offline we
* presume ring=1 of station 1 to mean the ME1b strips. We use the identifier
* ring=4 to denote the ME1a strips.
*
* \author Tim Cox
*
*/
#include "DataFormats/MuonDetId/interface/CSCDetId.h"
class CSCChannelMapperBase {
public:
CSCChannelMapperBase() {}
virtual ~CSCChannelMapperBase() {}
virtual std::string name() const { return "CSCChannelMapperBase"; }
/// Return raw strip channel number for input geometrical channel number
virtual int rawStripChannel(const CSCDetId &id, int igeom) const = 0;
/// Return raw wiregroup channel number for input geometrical channel number
int rawWireChannel(const CSCDetId &id, int igeom) const { return igeom; }
/// Return geometrical strip channel number for input raw channel number
virtual int geomStripChannel(const CSCDetId &id, int iraw) const = 0;
/// Return geometrical wiregroup channel number for input raw channel number
int geomWireChannel(const CSCDetId &id, int iraw) const { return iraw; }
/// Alias for rawStripChannel
int rawCathodeChannel(const CSCDetId &id, int igeom) const { return rawStripChannel(id, igeom); }
/// Alias for rawWireChannel
int rawAnodeChannel(const CSCDetId &id, int igeom) const { return rawWireChannel(id, igeom); }
/// Alias for geomStripChannel
int geomCathodeChannel(const CSCDetId &id, int iraw) const { return geomStripChannel(id, iraw); }
/// Alias for geomWireChannel
int geomAnodeChannel(const CSCDetId &id, int iraw) const { return geomWireChannel(id, iraw); }
/// Offline conversion of a strip (geometric labelling) back to channel
/// (At present this just has to convert the 48 strips of ME1A to 16 ganged
/// channels.)
virtual int channelFromStrip(const CSCDetId &id, int strip) const = 0;
/// Construct raw CSCDetId matching supplied offline CSCDetid
/// (At present all this has to do is return the ME11 CSCDetID when supplied
/// with that for ME1A)
virtual CSCDetId rawCSCDetId(const CSCDetId &id) const = 0;
};
#endif
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