/* Copyright: 
 * 		transaxtions llc
 *		4302 Denker Dr, Pleasanton, CA 94588, USA
 *
 * License: 
 * 		Please see License Agreement. Contact transaxtions llc for more info.
 * 
 * Author: 
 * 		Nagendra Nagarajayya
 * 
 * Ver: 
 * 		1.0
 * 
 * Description:
 * 		Needs 3-4 arguments. 
 * 		First argument, specifies the index, 
 * 		second the field, 
 * 		third, the search terms,
 * 		fourth optional, field name to output.
 *   
 * Comments: 
 * 		2010/12/27 - First release 
 */
package com.transaxtions.search.examples;

import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;

import com.transaxtions.search.rankingalgorithm.*;
/**
 * Example code showing RankingAlgorithm usage. Very easy to uses, similar to
 * Lucene API. Needs access to a Lucene index to work.
 * <pre>
 * {@code
 * args[0] is a lucene index path
 * args[1] is the field to search on
 * args[2] are the search terms
 * args[3] is the field to show in the results
 * 
 * Example: 
 * 	java com.transaxtions.search.example.Example "/lucene/perl/index" text "extracting strings from an array" id
 * }
 * </pre> 
 * 
 * @author Nagendra Nagarajayya
 * 
 * @see RankingQuery
 * @see RankingHits
 * @see RankingScore
 * 
 */
public class Example {	
	static public void main(String args[]) { 
		String index = args[0]; // lucene index path
		String field = args[1];	// field to search 	
		String searchterms = args[2]; // search terms
		String title = null;	// field to output, default title
		System.out.println("args len=" + args.length);
		if (args.length > 3) {
			title = args[3];
		}
		
		if (title == null) {
			title = "title";
		}
		
		try {
			RankingQuery rq = new RankingQuery();
			IndexSearcher is = new IndexSearcher(index);
			StandardAnalyzer analyzer = new StandardAnalyzer();
			QueryParser parser = new QueryParser(field, analyzer);
			Query query = parser.parse(searchterms);
			
			RankingHits rh = rq.search(query, is);
			System.out.println("num hits=" + rh.getNumHits() + "--no docs=" + is.maxDoc()); 
			for (int i=0; i<rh.getNumHits() && i<10; i++) {
				System.out.println("i=" + i + "--" + rh.score(i) + "--docid=" + rh.docid(i) + "--doc=" + is.doc(rh.docid(i)).get(title) );
			} 
		} catch(Throwable t) {
			t.printStackTrace();
		}
	}
}