FieldBelowWalker.hpp

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/*==========================================================================
 * Copyright (c) 2006 Carnegie Mellon University.  All Rights Reserved.
 *
 * Use of the Lemur Toolkit for Language Modeling and Information Retrieval
 * is subject to the terms of the software license set forth in the LICENSE
 * file included with this software (and below), and also available at
 * http://www.lemurproject.org/license.html
 *
 *==========================================================================
 */
#include "indri/Walker.hpp"

#ifndef INDRI_FIELDBELOWWALKER_HPP
#define INDRI_FIELDBELOWWALKER_HPP

namespace indri
{
  namespace lang
  {
    
    // Identifies where there's a field at or below the curent node in the query spec.
    // This is used by InferenceNetworkBuilder to determine whether the nested operators
    // are needed.

    class FieldBelowWalker : public indri::lang::Walker { 
    private:
     
      bool _seenField;
      
    public:
      FieldBelowWalker() : _seenField(false) {}
      
      
      bool fieldBelow() {
        return _seenField;
      }

      void before( indri::lang::Field* f ) {
        _seenField = true;
      }
    };
  }
}
#endif //INDRI_FIELDBELOWWALKER_HPP

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