VariableNode.h

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

#ifndef _MADARA_NO_KARL_

#include <string>
#include <vector>

#include "madara/expression/ComponentNode.h"
#include "madara/knowledge/ThreadSafeContext.h"
#include "madara/knowledge/KnowledgeRecord.h"
#include "madara/knowledge/KnowledgeUpdateSettings.h"

namespace madara
{
  namespace expression
  {
    // Forward declarations.
    class Visitor;

    class VariableNode : public ComponentNode
    {
    public:
      VariableNode (const std::string &key, 
        madara::knowledge::ThreadSafeContext & context);

      virtual ~VariableNode (void);

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

      int set (const madara::knowledge::KnowledgeRecord::Integer & value,
        const madara::knowledge::KnowledgeUpdateSettings & settings =
        knowledge::KnowledgeUpdateSettings ());
      
      int set (double value,
        const madara::knowledge::KnowledgeUpdateSettings & settings =
        knowledge::KnowledgeUpdateSettings ());
      
      int set (const std::string & value,
        const madara::knowledge::KnowledgeUpdateSettings & settings =
        knowledge::KnowledgeUpdateSettings ());
      
      int set (const madara::knowledge::KnowledgeRecord & value,
        const madara::knowledge::KnowledgeUpdateSettings & settings =
        knowledge::KnowledgeUpdateSettings ());
      
      madara::knowledge::KnowledgeRecord inc (
        const madara::knowledge::KnowledgeUpdateSettings & settings =
        knowledge::KnowledgeUpdateSettings ());

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

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

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

      std::string expand_key (void) const;

      const std::string & key (void) const;

      virtual void accept (Visitor &visitor) const; 

      inline
      madara::knowledge::KnowledgeRecord * get_record (void)
      {
        if (record_)
          return record_;
        else
          return context_.get_record (expand_key ());
      }

    private:

      std::string expand_opener (size_t opener, size_t & closer) const;

      const std::string key_;
      madara::knowledge::KnowledgeRecord * record_;

      madara::knowledge::ThreadSafeContext & context_;

      bool key_expansion_necessary_;

      std::vector<size_t> markers_;

    };
  }
}

#endif // _MADARA_NO_KARL_

#endif /* _MADARA_VARIABLE_NODE_H_ */