CompositeAndNode.cpp

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/* -*- C++ -*- */

#ifndef COMPOSITE_AND_NODE_CPP
#define COMPOSITE_AND_NODE_CPP

#ifndef _MADARA_NO_KARL_

#include <iostream>

#include "madara/expression/ComponentNode.h"
#include "madara/expression/Visitor.h"
#include "madara/expression/CompositeAndNode.h"
#include "madara/expression/LeafNode.h"


// Ctor

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

madara::knowledge::KnowledgeRecord
madara::expression::CompositeAndNode::item (void) const
{
  return knowledge::KnowledgeRecord("&&");
}


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

  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 = knowledge::KnowledgeRecord (
        value && return_value);

    can_change = can_change || value_changes;
  }

  if (nodes_.size () < 2)
  {
    madara_logger_ptr_log (logger_, logger::LOG_ERROR,
      "CompositeAndNode: "
      "KARL COMPILE ERROR (&&): "
      "And should have a left and right-hand side argument.\n");

    throw KarlException ("CompositeAndNode: "
      "KARL COMPILE ERROR (&&): "
      "And should have a left and right-hand side argument.\n");
  }

  return return_value;
}

madara::knowledge::KnowledgeRecord 
madara::expression::CompositeAndNode::evaluate (
  const madara::knowledge::KnowledgeUpdateSettings & settings)
{
  int j = 0;
  for (ComponentNodes::iterator i = nodes_.begin ();
       i != nodes_.end (); ++i, ++j)
  {
    // if we have a zero eval, return 0 immediately
    if ((*i)->evaluate (settings).is_false ())
      return madara::knowledge::KnowledgeRecord (0);
  }

  // if everything was true, return true
  return madara::knowledge::KnowledgeRecord (1);
}


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

#endif // _MADARA_NO_KARL_

#endif /* COMPOSITE_AND_NODE_CPP */