VariableCompareNode.h

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/* -*- C++ -*- */
#ifndef _MADARA_VARIABLE_COMPARE_NODE_H_
#define _MADARA_VARIABLE_COMPARE_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 VariableCompareNode : public ComponentNode
{
public:
  VariableCompareNode(ComponentNode* lhs,
      madara::knowledge::KnowledgeRecord value, int type, ComponentNode* rhs,
      madara::knowledge::ThreadSafeContext& context);
 
  enum Comparators
  {
    LESS_THAN = 0,
    LESS_THAN_EQUAL = 1,
    EQUAL = 2,
    GREATER_THAN = 3,
    GREATER_THAN_EQUAL = 4
  };
 
  virtual ~VariableCompareNode(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);
 
  std::string expand_key(void) const;
 
  const std::string& key(void) const;
 
  virtual void accept(Visitor& visitor) const;
 
private:
  VariableNode* var_;
 
  CompositeArrayReference* array_;
 
  madara::knowledge::KnowledgeRecord value_;
 
  ComponentNode* rhs_;
 
  madara::knowledge::ThreadSafeContext& context_;
 
  int compare_type_;
 
};
}
}
 
#endif  // _MADARA_NO_KARL_
 
#endif /* _MADARA_VARIABLE_COMPARE_NODE_H_ */