//----------------------------------------------------------------------
// Includes
//----------------------------------------------------------------------
#include "MantidAlgorithms/CommutativeBinaryOperation.h"

namespace Mantid {
namespace Algorithms {
/** Performs a simple check to see if the sizes of two workspaces are compatible
 * for a binary operation
 * In order to be size compatible then the larger workspace
 * must divide be the size of the smaller workspace leaving no remainder
 * @param lhs :: the workspace treated as the lhs to compare
 * @param rhs :: the workspace treated as the rhs to compare
 * @retval "" The two workspaces are size compatible
 * @retval "<reason why not compatible>" The two workspaces are NOT size
 * compatible
 */
std::string CommutativeBinaryOperation::checkSizeCompatibility(
    const API::MatrixWorkspace_const_sptr lhs,
    const API::MatrixWorkspace_const_sptr rhs) const {
  // Don't allow this for EventWorkspaces. See for instance
  // Multiply::checkSizeCompatability
  if (boost::dynamic_pointer_cast<const DataObjects::EventWorkspace>(lhs) ||
      boost::dynamic_pointer_cast<const DataObjects::EventWorkspace>(rhs)) {
    // call the base routine
    return BinaryOperation::checkSizeCompatibility(lhs, rhs);
  }

  // get the largest workspace
  API::MatrixWorkspace_const_sptr wsLarger;
  API::MatrixWorkspace_const_sptr wsSmaller;
  if (rhs->size() > lhs->size()) {
    wsLarger = rhs;
    wsSmaller = lhs;
  } else {
    wsLarger = lhs;
    wsSmaller = rhs;
  }
  // call the base routine
  return BinaryOperation::checkSizeCompatibility(wsLarger, wsSmaller);
}
}
}