searcherimpl.java

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package jaoso.framework.core.search.lucene;

import jaoso.framework.core.search.SearchUtil;
import jaoso.framework.core.search.Searcher;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.queryParser.ParseException;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.Hits;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;

import java.io.IOException;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;


/**
 * @author        Quake Wang
 * @since        2004-5-21
 * @version $Revision: 1.5 $
 *
 **/
public class SearcherImpl implements Searcher {

    //~ Static fields/initializers =============================================

    /**  DOCUMENT ME! */
    private static final Log log = LogFactory.getLog(SearcherImpl.class);

    //~ Instance fields ========================================================

    /**  DOCUMENT ME! */
    private Analyzer analyzer;

    /**  DOCUMENT ME! */
    private IndexStore indexStore;

    /**  DOCUMENT ME! */
    private String[] defaultFields;

    //~ Constructors ===========================================================

    /**
     * Creates a new SearcherImpl object.
     */
    public SearcherImpl() {

        indexStore = new IndexStore();
    }

    //~ Methods ================================================================

    /**
     * DOCUMENT ME!
     *
     * @param analyzer DOCUMENT ME!
     */
    public void setAnalyzer(Analyzer analyzer) {

        this.analyzer = analyzer;
    }

    /**
     * DOCUMENT ME!
     *
     * @param strings DOCUMENT ME!
     */
    public void setDefaultFields(String[] strings) {

        defaultFields = strings;
    }

    /**
     * DOCUMENT ME!
     *
     * @param query DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Collection search(String query) {

        return search(defaultFields, query);
    }

    /**
     * DOCUMENT ME!
     *
     * @param searchFields DOCUMENT ME!
     * @param query DOCUMENT ME!
     *
     * @return DOCUMENT ME!
     */
    public Collection search(String[] searchFields, String query) {

        List result = new ArrayList();

        if ((query == null) || (query.trim()
                                         .length() < 1)) {

            return result;
        }

        IndexSearcher searcher = null;

        try {

            searcher = indexStore.createSearcher();

            Query luceneQuery = null;

            if (searchFields.length == 1) {

                QueryParser qp = new QueryParser(searchFields[0], analyzer);
                luceneQuery = qp.parse(query);
            } else {

                luceneQuery = MultiFieldQueryParser.parse(query, searchFields,
                        analyzer);
            }

            Hits hits = searcher.search(luceneQuery);

            for (int i = 0; i < hits.length(); i++) {

                Document doc = hits.doc(i);
                result.add(doc.get(SearchUtil.IDENTIFIER));
            }
        } catch (IOException ioe) {

            log.error(ioe);
        } catch (ParseException pe) {

            log.error(pe);
        } finally {

            if (searcher != null) {

                try {

                    searcher.close();
                } catch (IOException ioe) {

                    log.warn(ioe);
                }
            }
        }

        return result;
    }
}