Zoltan2_BasicIdentifierAdapter.hpp

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// @HEADER
// *****************************************************************************
//   Zoltan2: A package of combinatorial algorithms for scientific computing
//
// Copyright 2012 NTESS and the Zoltan2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef _ZOLTAN2_BASICIDENTIFIERADAPTER_HPP_
#define _ZOLTAN2_BASICIDENTIFIERADAPTER_HPP_

#include <Zoltan2_IdentifierAdapter.hpp>
#include <Zoltan2_StridedData.hpp>

namespace Zoltan2 {

template <typename User>
  class BasicIdentifierAdapter: public IdentifierAdapter<User> {

public:
  typedef typename InputTraits<User>::scalar_t scalar_t;
  typedef typename InputTraits<User>::lno_t    lno_t;
  typedef typename InputTraits<User>::gno_t    gno_t;
  typedef typename InputTraits<User>::part_t   part_t;
  typedef typename InputTraits<User>::node_t   node_t;
  typedef User user_t;

  BasicIdentifierAdapter(lno_t numIds, const gno_t *idPtr, 
    std::vector<const scalar_t *> &weights, std::vector<int> &weightStrides);

  BasicIdentifierAdapter(lno_t numIds, const gno_t *idPtr):
      numIds_(numIds), idList_(idPtr), weights_() {}

  // The Adapter interface.

  size_t getLocalNumIDs() const { return numIds_; }

  void getIDsView(const gno_t *&Ids) const { Ids = idList_; }

  int getNumWeightsPerID() const { return weights_.size(); }

  void getWeightsView(const scalar_t *&weights, int &stride, int idx) const {
    if (idx < 0 || idx >= weights_.size()) {
      std::ostringstream emsg;
      emsg << __FILE__ << ":" << __LINE__
           << "  Invalid weight index " << idx << std::endl;
      throw std::runtime_error(emsg.str());
    }
    size_t length;
    weights_[idx].getStridedList(length, weights, stride);
  }

private:
  lno_t numIds_;
  const gno_t *idList_;
  ArrayRCP<StridedData<lno_t, scalar_t> > weights_;
};

// Definitions

template <typename User>
  BasicIdentifierAdapter<User>::BasicIdentifierAdapter(
    lno_t numIds, const gno_t *idPtr,
    std::vector<const scalar_t *> &weights, std::vector<int> &weightStrides):
      numIds_(numIds), idList_(idPtr), weights_()
{
  typedef StridedData<lno_t, scalar_t> input_t;
  size_t numWeights = weights.size();

  if (numWeights > 0){
    weights_ = arcp(new input_t [numWeights], 0, numWeights, true);

    if (numIds > 0){
      for (size_t i = 0; i < numWeights; i++){
        int stride = weightStrides.size() ? weightStrides[i] : 1;
        ArrayRCP<const scalar_t> wgtV(weights[i], 0, stride * numIds, false);
        weights_[i] = input_t(wgtV, stride);
      }
    }
  }
}
  
}  //namespace Zoltan2
  
#endif