ExpressionTree.h

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

#ifndef _MADARA_KNOWLEDGE_EXPRESSION_TREE_H_
#define _MADARA_KNOWLEDGE_EXPRESSION_TREE_H_

#ifndef _MADARA_NO_KARL_

#include <string>
#include <stdexcept>
#include "madara/utility/Refcounter.h"

#include "madara/logger/GlobalLogger.h"
#include "madara/expression/ComponentNode.h"
#include "madara/knowledge/KnowledgeRecord.h"

namespace madara
{
  namespace expression
  {
    // Forward declarations.
    class ExpressionTreeIterator;
    class ExpressionTreeConstIterator;

    class ExpressionTree
    {
    public:

      // Define a "trait"
      typedef madara::knowledge::KnowledgeRecord value_type;
      typedef ExpressionTreeIterator iterator;
      typedef ExpressionTreeConstIterator const_iterator;

      ExpressionTree (logger::Logger & logger =
        *logger::global_logger.get ());

      ExpressionTree (logger::Logger & logger,
        ComponentNode *root, bool increase_count = false);

      ExpressionTree (logger::Logger & logger, const ExpressionTree &tree);

      ~ExpressionTree (void);

      ComponentNode * get_root (void);

      void operator= (const ExpressionTree &tree);

      bool is_null (void) const;

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


      madara::knowledge::KnowledgeRecord prune (void);

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

      ExpressionTree left (void);

      ExpressionTree right (void);

      iterator begin (const std::string & traversal_order);

      iterator end (const std::string & traversal_order);

      const_iterator begin (const std::string & traversal_order) const;

      const_iterator end (const std::string & traversal_order) const;

      void accept (Visitor & visitor) const;

    private:
      logger::Logger * logger_;

      madara::utility::Refcounter <ComponentNode> root_;
    };

  }
}

#endif // _MADARA_NO_KARL_

#endif /* _MADARA_KNOWLEDGE_EXPRESSION_TREE_H_ */