DiscreteValueVect.h

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//
//  Copyright (C) 2004-2008 Greg Landrum and Rational Discovery LLC
//
//  @@ All Rights Reserved @@
//  This file is part of the RDKit.
//  The contents are covered by the terms of the BSD license
//  which is included in the file license.txt, found at the root
//  of the RDKit source tree.
//
#ifndef __RD_DISCRETE_VALUE_VECT_20050124__
#define __RD_DISCRETE_VALUE_VECT_20050124__

#include <boost/smart_ptr.hpp>
#include <string>
#include <cstring>
#include <boost/cstdint.hpp>

namespace RDKit {
// we require 32bit unsigneds using the boost::uint32_t type:
const unsigned int BITS_PER_INT = 32;

//! a class for efficiently storing vectors of discrete values
class DiscreteValueVect {
 public:
  typedef boost::shared_array<boost::uint32_t> DATA_SPTR;

  //! used to define the possible range of the values
  typedef enum {
    ONEBITVALUE = 0,
    TWOBITVALUE,
    FOURBITVALUE,
    EIGHTBITVALUE,
    SIXTEENBITVALUE,
  } DiscreteValueType;

  //! initialize with a particular type and size
  DiscreteValueVect(DiscreteValueType valType, unsigned int length)
      : d_type(valType), d_length(length) {
    d_bitsPerVal = (1 << static_cast<unsigned int>(valType));
    d_valsPerInt = BITS_PER_INT / d_bitsPerVal;
    d_numInts = (length + d_valsPerInt - 1) / d_valsPerInt;
    d_mask = ((1 << d_bitsPerVal) - 1);
    boost::uint32_t *data = new boost::uint32_t[d_numInts];
    memset(static_cast<void *>(data), 0, d_numInts * sizeof(boost::uint32_t));
    d_data.reset(data);
  }

  //! Copy constructor
  DiscreteValueVect(const DiscreteValueVect &other);

  //! constructor from a pickle
  DiscreteValueVect(const std::string &pkl) {
    initFromText(pkl.c_str(), pkl.size());
  };
  //! constructor from a pickle
  DiscreteValueVect(const char *pkl, const unsigned int len) {
    initFromText(pkl, len);
  };

  ~DiscreteValueVect() {}

  //! return the value at an index
  unsigned int getVal(unsigned int i) const;

  //! support indexing using []
  int operator[](unsigned int idx) const { return getVal(idx); };

  //! set the value at an index
  /*!
    NOTE: it is an error to have val > the max value this
    DiscreteValueVect can accomodate
  */
  void setVal(unsigned int i, unsigned int val);

  //! returns the sum of all the elements in the vect
  unsigned int getTotalVal() const;

  //! returns the length
  unsigned int getLength() const;
  //! returns the length
  unsigned int size() const { return getLength(); };

  //! return a pointer to our raw data storage
  const boost::uint32_t *getData() const;

  //! return the number of bits used to store each value
  unsigned int getNumBitsPerVal() const { return d_bitsPerVal; }

  //! return the type of value being stored
  DiscreteValueType getValueType() const { return d_type; }

  //! returns the size of our storage
  unsigned int getNumInts() const { return d_numInts; }

  //! support dvv3 = dvv1&dvv2
  /*!

     operator& returns the minimum value for each element.
     e.g.:
       [0,1,2,0] & [0,1,1,1] -> [0,1,1,0]

  */
  DiscreteValueVect operator&(const DiscreteValueVect &other) const;
  //! support dvv3 = dvv1|dvv2
  /*!

     operator& returns the maximum value for each element.
     e.g.:
       [0,1,2,0] | [0,1,1,1] -> [0,1,2,1]

  */
  DiscreteValueVect operator|(const DiscreteValueVect &other) const;
  // DiscreteValueVect operator^ (const DiscreteValueVect &other) const;
  // DiscreteValueVect operator~ () const;

  DiscreteValueVect &operator+=(const DiscreteValueVect &other);
  DiscreteValueVect &operator-=(const DiscreteValueVect &other);

  //! returns a binary string representation (pickle)
  std::string toString() const;

 private:
  DiscreteValueType d_type;
  unsigned int d_bitsPerVal;
  unsigned int d_valsPerInt;
  unsigned int d_numInts;
  unsigned int d_length;
  unsigned int d_mask;
  DATA_SPTR d_data;

  void initFromText(const char *pkl, const unsigned int len);
};

unsigned int computeL1Norm(const DiscreteValueVect &v1,
                           const DiscreteValueVect &v2);

DiscreteValueVect operator+(const DiscreteValueVect &p1,
                            const DiscreteValueVect &p2);
DiscreteValueVect operator-(const DiscreteValueVect &p1,
                            const DiscreteValueVect &p2);
}

#endif