Scorer.h

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// Copyright (c) 2009-2014 Alan Wright. All rights reserved.
// Distributable under the terms of either the Apache License (Version 2.0)
// or the GNU Lesser General Public License.
 
#ifndef SCORER_H
#define SCORER_H
 
#include "DocIdSetIterator.h"
#include "BooleanClause.h"
#include "Weight.h"
 
namespace Lucene {
    
    
    class LPPAPI ScorerVisitor{
        public:
        virtual void visitOptional(QueryPtr parent,QueryPtr child,ScorerPtr scorer)=0;
        virtual void visitRequired(QueryPtr parent,QueryPtr child,ScorerPtr scorer)=0;
        virtual void visitProhibited(QueryPtr parent,QueryPtr child,ScorerPtr scorer)=0;
        
    };

class LPPAPI Scorer : public DocIdSetIterator {
public:
    Scorer(const SimilarityPtr& similarity);
    Scorer(const WeightPtr& weight);
    virtual ~Scorer();
 
    LUCENE_CLASS(Scorer);
    WeightPtr weight;
 
protected:
    SimilarityPtr similarity;
 
public:
    SimilarityPtr getSimilarity();

    virtual void score(const CollectorPtr& collector);

    virtual double score() = 0;
    
    void visitSubScorers(QueryPtr parent, BooleanClause::Occur relationship,
                         ScorerVisitor *visitor);
    
    void visitScorers(ScorerVisitor *visitor);
    
    virtual float termFreq(){
        boost::throw_exception(RuntimeException(L"Freq not implemented"));
    }
 
protected:
    virtual bool score(const CollectorPtr& collector, int32_t max, int32_t firstDocID);
 
    friend class BooleanScorer;
    friend class ScoreCachingWrappingScorer;
};
    
 
}
 
#endif