com.genexus.search.Searcher Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of gxsearch Show documentation
Core classes for the runtime used by Java and Android apps generated with GeneXus
The newest version!
package com.genexus.search;

import java.util.Date;

import org.apache.lucene.analysis.Analyzer;
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 org.apache.lucene.search.Sort;

import com.genexus.ModelContext;

public class Searcher {
	private Analyzer m_analyzer = Indexer.CreateAnalyzer();
	private static Searcher m_instance = new Searcher();
	private IndexSearcher m_searcher;

	private Searcher() {
	}

	public static Searcher getInstance() {
		return m_instance;
	}

	private String TranslateQuery(String query, ModelContext context) {
		/*
		 * try{ Pattern p; try { String rex = "\\([^\\(\\)]*\\)"; p =
		 * Pattern.compile(rex, Pattern.MULTILINE); } catch (PatternSyntaxException e) {
		 * return query; } Matcher m = p.matcher(query); while (m.find()) { String value
		 * = m.group(0); for (int i = 1; i <= m.groupCount(); i++) { if (m.group(i) !=
		 * null) { String match = m.group(i); String translatedStr =
		 * context.getHttpContext().getMessage(match.substring(1,match.length() - 2));
		 * query = GXutil.strReplace(query, match,translatedStr); } }
		 * 
		 * } return query; }catch (Exception e) { return query; }
		 */
		return query;
	}

	public SearchResult search(String query, int maxresults) {
		return search(query, maxresults, 0, null);
	}

	public SearchResult search(String query, int itemsPerPage, int pageNumber, ModelContext context) {
		if (query == null || query.length() == 0)
			return SearchResult.getEmpty();

		if (context != null) {
			query = TranslateQuery(query, context);
		}
		IndexSearcher searcher = getSearcher();
		if (searcher == null)
			return SearchResult.getEmpty();

		QueryParser qp = new QueryParser(IndexRecord.CONTENTFIELD, m_analyzer);
		qp.setAllowLeadingWildcard(true);
		qp.setDefaultOperator(QueryParser.Operator.AND);
		try {
			Query q = qp.parse(IndexRecord.processContent(query));
			Date t1 = new Date();
			Hits hits = searcher.search(q, Sort.RELEVANCE);
			Date t2 = new Date();
			// searcher.close();
			// Closing the IndexSearcher is best only after a deleteDocuments with a reader
			// or changes with a writer.
			// For performance reasons, it is better to not close the IndexSearcher if not
			// needed
			return new SearchResult(hits, itemsPerPage, pageNumber, t2.getTime() - t1.getTime());
		} catch (Exception ex) {
			ex.printStackTrace();
			return null;
		}
	}

	public void close() {
		if (m_searcher != null) {
			try {
				m_searcher.close();
				m_searcher = null;
			} catch (Exception ex) {
			}
		}
	}

	private IndexSearcher getSearcher() {
		try {
			if (m_searcher == null)
				m_searcher = new IndexSearcher(Settings.getInstance().getIndexFolder());
			return m_searcher;
		} catch (Exception ex) {
			return null;
		}
	}
}