XOrQuery.h

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//
// Copyright (c) 2003-2006 Greg Landrum and Rational Discovery LLC
//
//   @@ All Rights Reserved  @@
//
#ifndef __RD_XORQUERY_H__
#define __RD_XORQUERY_H__

#include "Query.h"

namespace Queries{

  //! a Query implementing XOR: requires exactly one child to be \c true
  template <class MatchFuncArgType, class DataFuncArgType=MatchFuncArgType,
    bool needsConversion=false>
  class XOrQuery : public Query<MatchFuncArgType, DataFuncArgType,needsConversion> {

  public:
    typedef Query<MatchFuncArgType, DataFuncArgType,needsConversion> BASE;
    XOrQuery() {
      this->df_negate = false;
    };

    bool Match(const DataFuncArgType what) const {
      bool res = false;
      typename BASE::CHILD_VECT_CI it1;
      for(it1=this->beginChildren();
          it1!=this->endChildren();
          ++it1){
        bool tmp = (*it1)->Match(what);
        if( tmp ){
          if( res ){
            res = false;
            break;
          } else{
            res = true;
          }
        }
      }
      if( this->getNegation() ) res = !res;
      return res;
    };

    Query<MatchFuncArgType,DataFuncArgType,needsConversion> *
    copy( ) const {
      XOrQuery<MatchFuncArgType,DataFuncArgType,needsConversion> *res =
        new XOrQuery<MatchFuncArgType,DataFuncArgType,needsConversion>();

      typename BASE::CHILD_VECT_CI i;
      for(i=this->beginChildren();
          i!=this->endChildren();
          ++i){
        res->addChild(*i);
      }
      res->setNegation(this->getNegation());
      res->d_description = this->d_description;
      return res;
    };
  };

}
#endif

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