Java – how to index and search numbers in Lucene 4.1

In my 3.6 code, I add numeric fields to my index as follows:

public void addNumericField(IndexField field,Integer value) {
        addField(field,NumericUtils.intToPrefixCoded(value));
    }

But now you need to pass a bytesref parameter, and you don't know what your intention for the next value is, so I change it to (in progress)

public void addNumericField(IndexField field,Integer value) {
        FieldType ft = new FieldType();
        ft.setStored(true);
        ft.setIndexed(true);
        ft.setNumericType(FieldType.NumericType.INT);
        doc.add(new IntField(field.getName(),value,ft));
    }

It looks cleaner

In 3.6, I also added override queryparser to make it suitable for numerical range search,

package org.musicbrainz.search.servlet;

import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.MultiFieldQueryParser;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.apache.lucene.search.TermRangeQuery;
import org.apache.lucene.util.NumericUtils;
import org.musicbrainz.search.LuceneVersion;
import org.musicbrainz.search.index.LabelIndexField;
import org.musicbrainz.search.servlet.mmd1.LabelType;

public class LabelQueryParser extends MultiFieldQueryParser {

    public LabelQueryParser(java.lang.String[] strings,org.apache.lucene.analysis.Analyzer analyzer)
    {
        super(LuceneVersion.LUCENE_VERSION,strings,analyzer);
    }

     protected Query newTermQuery(Term term) {

        if(
                (term.field() == LabelIndexField.CODE.getName())
                ){
            try {
                int number = Integer.parseInt(term.text());
                TermQuery tq = new TermQuery(new Term(term.field(),NumericUtils.intToPrefixCoded(number)));
                return tq;
            }
            catch (NumberFormatException nfe) {
                //If not provided numeric argument just leave as is,//won't give matches
                return super.newTermQuery(term);
            }
        } else {
            return super.newTermQuery(term);

        }
    }

    /**
     *
     * Convert Numeric Fields
     *
     * @param field
     * @param part1
     * @param part2
     * @param inclusive
     * @return
     */
    @Override
    public Query newRangeQuery(String field,String part1,String part2,boolean inclusive) {

        if (
                (field.equals(LabelIndexField.CODE.getName()))
            )
        {
            part1 = NumericUtils.intToPrefixCoded(Integer.parseInt(part1));
            part2 = NumericUtils.intToPrefixCoded(Integer.parseInt(part2));
        }
        TermRangeQuery query = (TermRangeQuery)
                super.newRangeQuery(field,part1,part2,inclusive);
        return query;
    }

}

So I figured it out. I don't need it anymore, but unfortunately, this intfield doesn't have any questions now

Further reading, it seems that intfields is only used for range queries, so I don't know how you do matching queries and whether numericrangequery is compatible with the classic query parser I'm using

So I then try to add my value as an encoded string

public void addNumericField(IndexField field,Integer value) {

    FieldType fieldType = new FieldType();
    fieldType.setStored(true);
    fieldType.setIndexed(true);
    BytesRef bytes = new BytesRef(NumericUtils.BUF_SIZE_INT);
    NumericUtils.intToPrefixCoded(value,bytes);
    doc.add(new Field(field.getName(),bytes,fieldType));
}

But at runtime I now receive an error!

java.lang.IllegalArgumentException: Fields with BytesRef values cannot be indexed

But I need index fields, so how do I index numeric fields, as I did in 3.6, so I can search them

Solution

Just use the appropriate fields For example, intfield, longfield, etc

See e.g http://lucene.apache.org/core/4_1_0/core/org/apache/lucene/document/IntField.html

For information about querying these fields, see Lucene longfield exact search with query