FullTextEntityQuery

[bmoraillon]

Hi,
i'm seraching for a FullTextEntityQuery bean which could perform hibernate full
text search as EntityQuery does with restriction.

Does it exists ?

Best Regards.

[flopsi]

Hi Benoit!
Did you find out how to do it? To be precise i want to use some kind of EntityQuery to mix EJBQL and Lucene queries into one...
Thanks a lot, best regards
Flo

[blabno]

Abstract base for quries :

public abstract class FullTextSearchEntityQuery<T> extends EntityQuery<T> {

    private Long resultSize;

    public FullTextSearchEntityQuery() {
        setEjbql("hehehe ! I'm cheating EntityQuery.validate() and others where query=#{search.query}");
    }

    /**
     * Subclasses must return field names on which search should be conducted.
     */
    protected abstract String[] getFields();

    @Override
    protected Query createQuery() {
        parseEjbql();
        evaluateAllParameters();
        FullTextQuery query = ((FullTextEntityManager) getEntityManager()).createFullTextQuery(createLuceneQuery(Search.instance().getQuery(), getFields()), getEntityClass());
        if (getFirstResult() != null) {
            query.setFirstResult(getFirstResult());
        }
        if (getMaxResults() != null) {
            query.setMaxResults(getMaxResults());
        }
        return query;
    }

    @Override
    public Long getResultCount() {
        if (isAnyParameterDirty()) {
            resultSize = (long) ((FullTextQuery) createQuery()).getResultSize();
        }
        return resultSize;
    }

    private org.apache.lucene.search.Query createLuceneQuery(String words, String[] fields) {
        QueryParser parser = new MultiFieldQueryParser(fields, new SimpleAnalyzer());
        org.apache.lucene.search.Query luceneQuery;
        try {
            luceneQuery = parser.parse(words);
        }
        catch (org.apache.lucene.queryParser.ParseException e) {
            throw new IllegalArgumentException(
                    "Unable to parse search entry into a Lucene query", e);
        }
        return luceneQuery;

    }
}

And here we declare particular query :

@Name("locationFullTextSearch")
public class LocationFullTextSearch extends FullTextSearchEntityQuery<Location> {

    private String[] fields = new String[]{"name"};


    protected String[] getFields() {
        return fields;
    }

}

Have you noticed Search.instance() in FullTextSearchEntityQuery ? This is it, but you can pass query string any other way.

@Name("search")
public class Search {

    @Logger
    private Log log;
    private String query;


    public static Search instance() {
        return (Search) Component.getInstance(Search.class);
    }

    public String getQuery() {
        return query;
    }

    public void setQuery(String query) {
        if (query != null && !query.equals(this.query)) {
            log.info("Query:#0", query);
        }
        this.query = query;
    }

}

[flopsi]

Okay, so nothing ootb, but extending EntityQuery seems also straightforward to me. I hope there will be some more ootb integration in one of the next Seam releases...
Thanks + regards

[alartin]

I do think you did not post all the code. You invoke getEntityClass() method in the createQuery(), but I can not find it in your code. I guess the reason you use a getEntityClass() method to get the class type hibernate search needs is due to the fact we can get the Entity Class type during runtime because we use a generic type <T> here. So, I guess you have a private field of Class<T> entity in your code to fix this problem.