LUT.h

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//

#ifndef CondFormats_L1TObjects_LUT_h
#define CondFormats_L1TObjects_LUT_h

#include <iostream>
#include <vector>
#include <limits>

namespace l1t{

  class LUT{
    public:
    enum ReadCodes {
      SUCCESS=0,NO_ENTRIES=1,DUP_ENTRIES=2,MISS_ENTRIES=3,MAX_ADDRESS_OUTOFRANGE=4,NO_HEADER=5
    };
    
    LUT():data_(){}
      
    explicit LUT(std::istream& stream) :
      data_()
    {
      read(stream);
    }
    
    
    ~LUT(){}
    
    int data(unsigned int address)const{return (address&addressMask_)<data_.size() ? dataMask_ & data_[addressMask_&address] : 0;}
    int read(std::istream& stream);
    void write(std::ostream& stream)const;

    unsigned int nrBitsAddress()const{return nrBitsAddress_;}
    unsigned int nrBitsData()const{return nrBitsData_;}
    //following the convention of vector::size()
    unsigned int maxSize()const{return addressMask_==std::numeric_limits<unsigned int>::max() ? addressMask_ : addressMask_+1;}
    bool empty()const{return data_.empty();}
   
  private:
    
    int readHeader_(std::istream&);

    unsigned int nrBitsAddress_; //technically redundant with addressMask
    unsigned int nrBitsData_;//technically redundant with dataMask
    unsigned int addressMask_;
    unsigned int dataMask_;
   
    std::vector<int> data_;
  };
    
}

#endif