VariableDecrementNode.h

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

#ifndef _MADARA_NO_KARL_

#include <string>
#include <vector>

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

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

    class VariableDecrementNode : public ComponentNode
    {
    public:
      VariableDecrementNode (ComponentNode * lhs,
        madara::knowledge::KnowledgeRecord value,
        ComponentNode * rhs,
        madara::knowledge::ThreadSafeContext &context);

      virtual ~VariableDecrementNode (void);

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

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

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

      virtual void accept (Visitor &visitor) const; 

    private:
      VariableNode * var_;

      CompositeArrayReference * array_;

      madara::knowledge::KnowledgeRecord value_;
      
      ComponentNode * rhs_;

      madara::knowledge::ThreadSafeContext & context_;
    };
  }
}

#endif // _MADARA_NO_KARL_

#endif /* _MADARA_VARIABLE_DECREMENT_NODE_H_ */