Implement fuzzy search functionality

[Morten Haraldsen]

It is currently not possible to issue Lucene FuzzyQuery searches. I found a reference to a test-case for it but the functionality is not implemented yet. I like the syntax as found in the SimpleTest.java test in /tags/QUERYDSL_1_3_16/
<code>
// Fuzzy
// roam~ or roam~0.8
// c.ContactName.Like("roam") or c.ContactName.Like("roam", 0.8)
        // TODO
</code>

If anyone can tell me where to start I will be happy to implement it myself and provide a patch.

[Timo Westkämper (timo-westkamper)]

Thanks for your bug report. You can wrap arbitrary Lucene Query instances as com.mysema.query.lucene.QueryElement instances.

I just commited the following utility class with supports the creation of fuzzy queries as Querydsl filters :

public final class LuceneUtils {

    public static BooleanExpression fuzzyLike(Path<String> path, String value){
        Term term = new Term(path.getMetadata().getExpression().toString(), value);
        return new QueryElement(new FuzzyQuery(term));
    }

    public static BooleanExpression fuzzyLike(Path<String> path, String value, float minimumSimilarity){
        Term term = new Term(path.getMetadata().getExpression().toString(), value);
        return new QueryElement(new FuzzyQuery(term, minimumSimilarity));
    }

    public static BooleanExpression fuzzyLike(Path<String> path, String value, float minimumSimilarity, int prefixLength){
        Term term = new Term(path.getMetadata().getExpression().toString(), value);
        return new QueryElement(new FuzzyQuery(term, minimumSimilarity, prefixLength));
    }

    private LuceneUtils(){}

}

Feel free to suggest other additions.

[Morten Haraldsen (m-haraldsen)]

Wow! I just have to say that this teams response time is nothing short of incredible! Thank you!

[Timo Westkämper (timo-westkamper)]

You're welcome and thanks for your kind words.

[Timo Westkämper (timo-westkamper)]

Released in 2.0.4