ComponentNode.h

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

#ifndef _MADARA_NO_KARL_

#include <string>
#include <deque>
#include <stdexcept>
#include "madara/knowledge/KnowledgeRecord.h"
#include "madara/knowledge/KnowledgeUpdateSettings.h"
#include "madara/utility/StdInt.h"
#include "madara/logger/Logger.h"
#include "KarlException.h"

namespace madara
{
  namespace knowledge
  {
    class ThreadSafeContext;
  }

  namespace expression
  {
    // Forward declaration.
    class Visitor;

    class ComponentNode
    {
    public:
      ComponentNode (logger::Logger & logger);

      virtual ~ComponentNode (void) = 0;

      virtual madara::knowledge::KnowledgeRecord item (void) const;

      virtual madara::knowledge::KnowledgeRecord prune (bool & can_change) = 0;

      virtual madara::knowledge::KnowledgeRecord evaluate (
        const madara::knowledge::KnowledgeUpdateSettings & settings)
          = 0;

      virtual ComponentNode *left (void) const;

      virtual ComponentNode *right (void) const;

      virtual void accept (Visitor &visitor) const;

      void set_logger (logger::Logger & logger);

    protected:
      logger::Logger * logger_;
    };

    typedef   std::deque <ComponentNode *>   ComponentNodes;
  }
}

#endif // _MADARA_NO_KARL_

#endif /* _MADARA_COMPONENT_NODE_H_ */