CompositeMultiplyNode.cpp

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/* -*- C++ -*- */
#ifndef _MULTIPLY_NODE_CPP_
#define _MULTIPLY_NODE_CPP_

#ifndef _MADARA_NO_KARL_

#include <iostream>

#include "madara/expression/ComponentNode.h"
#include "madara/expression/CompositeBinaryNode.h"
#include "madara/expression/CompositeMultiplyNode.h"
#include "madara/expression/Visitor.h"
#include "madara/expression/LeafNode.h"

madara::expression::CompositeMultiplyNode::CompositeMultiplyNode (
  logger::Logger & logger, const ComponentNodes & nodes)
: madara::expression::CompositeTernaryNode (logger, nodes)
{
}

// Dtor
madara::expression::CompositeMultiplyNode::~CompositeMultiplyNode (void)
{
}

madara::knowledge::KnowledgeRecord
madara::expression::CompositeMultiplyNode::item (void) const
{
  return knowledge::KnowledgeRecord ("*");
}


madara::knowledge::KnowledgeRecord
madara::expression::CompositeMultiplyNode::prune (bool & can_change)
{
  madara::knowledge::KnowledgeRecord return_value;

  if (nodes_.size () >= 2)
  {
    int j = 0;
    for (ComponentNodes::iterator i = nodes_.begin ();
        i != nodes_.end (); ++i, ++j)
    {
      bool value_changes = false;
      madara::knowledge::KnowledgeRecord value;
      value = (*i)->prune (value_changes);
      if (!value_changes && dynamic_cast <LeafNode *> (*i) == 0)
      {
        delete *i;
        *i = new LeafNode (*(this->logger_), value);
      }

      if (j == 0)
        return_value = value;
      else
        return_value *= value;

      can_change = can_change || value_changes;
    }
  }
  else
  {
    madara_logger_ptr_log (logger_, logger::LOG_ERROR,
      "madara::expression::SystemCallLogLevel: "
      "KARL COMPILE ERROR: "
      "Multiplication is impossible without at least two values\n");

    throw KarlException ("madara::expression::SystemCallLogLevel: "
      "KARL COMPILE ERROR: "
      "Multiplication is impossible without at least two values\n");
  }

  return return_value;
}

madara::knowledge::KnowledgeRecord 
madara::expression::CompositeMultiplyNode::evaluate (
  const madara::knowledge::KnowledgeUpdateSettings & settings)
{
  madara::knowledge::KnowledgeRecord return_value;

  int j = 0;
  for (ComponentNodes::iterator i = nodes_.begin ();
       i != nodes_.end (); ++i, ++j)
  {
    madara::knowledge::KnowledgeRecord value = (*i)->evaluate (settings);
    
    if (j == 0)
      return_value = value;
    else
      return_value *= value;
  }

  return return_value;
}


// accept a visitor
void 
madara::expression::CompositeMultiplyNode::accept (Visitor& visitor) const
{
  visitor.visit (*this);
}

#endif // _MADARA_NO_KARL_

#endif /* _MULTIPLY_NODE_CPP_ */