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#ifndef CSCChannelTranslator_h
#define CSCChannelTranslator_h
/**
* \class CSCChannelTranslator
*
* Maps 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.
*
* It is expected that this class will one day need to make use of a 'cable map' stored
* in conditions data. At present it does not, and the mappings are hard-coded.
*
* Currently this class does the following: <BR>
* 1. Sorts out the readout-flipping within the two endcaps for ME1a and ME1b strip channels. <BR>
* 2. Maps the ME1a channels from online labels 65-80 to offline 1-16. It is expected that in the long
* run we may drop the offline convention for ME1a as an independent CSCDetId but this has not yet
* been done. When it is, this conversion will be removed. <BR>
* 3. Does nothing with wiregroup channels; the output = the input. In the long term we intend to
* move remapping currently embedded in the CSCRawToDigi unpacker into this class.<BR>
*
* Beware that the 48 strips in ME1a are ganged to 16 channels, so be careful to distinguish
* the nomenclatures 'strip' vs 'channel'. It is usually a meaningful distinction!
*
* Also note that CSCDetId for ME11 and ME1b are 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 CSCChannelTranslator {
public:
CSCChannelTranslator() {}
~CSCChannelTranslator() {}
/// Return raw strip channel number for input geometrical channel number
int rawStripChannel(const CSCDetId& id, int igeom) const;
/// 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
int geomStripChannel(const CSCDetId& id, int iraw) const;
/// 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.)
int channelFromStrip(const CSCDetId& id, int strip) const;
/// 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)
CSCDetId rawCSCDetId(const CSCDetId& id) const;
};
#endif
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