CODEWITHSUNDEEP
javalucenescoring
user2615644
user2615644

Reputation:

Lucene Custom Scoring

I want to make a lucene custom scoring function that takes a value stored in a document and add it to the final score.

I already figured out how to add a value to the scoring function , but I can't manage to get a stored value of a document into the method.

 class CustomizedScoreProvider extends CustomScoreProvider {

    public CustomizedScoreProvider(LeafReaderContext reader) {
            super(reader);
            // TODO Auto-generated constructor stub
        }

    public  float customScore(int doc, float subQueryScore,float valSrcScores[]){

     try {

         subQueryScore+=4; \\ I only added this for testing , 
     } catch(Exception e) { \\ I want to add a value that is stored in a field of a document
         e.printStackTrace();
            }
    return subQueryScore;
             }
    }

class CustomizedScoreQuery extends CustomScoreQuery{


public CustomizedScoreQuery(Query subQuery,IndexReader ireader) {
        super(subQuery);
        // TODO Auto-generated constructor stub
    }
public CustomizedScoreProvider getCustomScoreProvider (LeafReaderContext reader){
    CustomizedScoreProvider i=new CustomizedScoreProvider(reader);
     return (i);
}
}

Upvotes: 2

Views: 907

Answers (2)

user2615644
user2615644

Reputation:

Thank you , but I already solved the problem, with the index reader I searched for the file, then I extracted the value of the field I wanted to use.

class CustomizedScoreProvider extends CustomScoreProvider {
private LeafReaderContext context;
public CustomizedScoreProvider(LeafReaderContext reader) {
        super(reader);
        this.context= reader;
        // TODO Auto-generated constructor stub
    }

public  float customScore(int doc, float subQueryScore,float valSrcScores[]) throws IOException{

    Document Social=context.reader().document(doc);
     IndexableField i= Social.getField("soc");// the field I wanted to extract
     float k= (float)i.numericValue();
     subQueryScore+=k;

return subQueryScore;
         }
}

Upvotes: 3

S. Pilon
S. Pilon

Reputation: 1

If I understood what you are trying to do, then you need to open a file (your "document") and parse a float.

Here it is explained how to open a file and get it's contents in several different ways: How to open a txt file and read numbers in java

Note that you will need Float.parseFloat(String s) instead of Integer.parseInt(String s).

Upvotes: -2

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