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 "madara/exceptions/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_ */