package proj.zoie.example.service.impl;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.apache.log4j.Logger;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Fieldable;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.MatchAllDocsQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.Searcher;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.search.highlight.Highlighter;
import org.apache.lucene.search.highlight.QueryScorer;
import org.apache.lucene.search.highlight.Scorer;
import org.apache.lucene.search.highlight.SimpleHTMLFormatter;
import org.apache.lucene.util.Version;
import proj.zoie.api.IndexReaderFactory;
import proj.zoie.api.ZoieException;
import proj.zoie.api.ZoieIndexReader;
import proj.zoie.service.api.SearchHit;
import proj.zoie.service.api.SearchRequest;
import proj.zoie.service.api.SearchResult;
import proj.zoie.service.api.ZoieSearchService;
public class ExampleZoieSearchServiceImpl<R extends IndexReader> implements ZoieSearchService {
private static final Logger log = Logger.getLogger(ExampleZoieSearchServiceImpl.class);
private IndexReaderFactory<ZoieIndexReader<R>> _idxReaderFactory;
public ExampleZoieSearchServiceImpl(IndexReaderFactory<ZoieIndexReader<R>> idxReaderFactory){
_idxReaderFactory=idxReaderFactory;
}
private static Map<String,String[]> convert(Document doc)
{
Map<String,String[]> map=new HashMap<String,String[]>();
if (doc!=null)
{
List<Fieldable> fields=(List<Fieldable>)doc.getFields();
Iterator<Fieldable> iter=fields.iterator();
while(iter.hasNext())
{
Fieldable fld=iter.next();
String fieldname=fld.name();
map.put(fieldname, doc.getValues(fieldname));
}
}
return map;
}
public SearchResult search(SearchRequest req) throws ZoieException{
String queryString=req.getQuery();
Analyzer analyzer=_idxReaderFactory.getAnalyzer();
QueryParser qparser=new QueryParser(Version.LUCENE_CURRENT,"content",analyzer);
SearchResult result=new SearchResult();
List<ZoieIndexReader<R>> readers=null;
MultiReader multiReader=null;
Searcher searcher = null;
try
{
Query q=null;
if (queryString == null || queryString.length() ==0)
{
q = new MatchAllDocsQuery();
}
else
{
q = qparser.parse(queryString);
}
readers=_idxReaderFactory.getIndexReaders();
multiReader=new MultiReader(readers.toArray(new IndexReader[readers.size()]), false);
searcher=new IndexSearcher(multiReader);
long start=System.currentTimeMillis();
TopDocs docs=searcher.search(q, null, 10);
long end=System.currentTimeMillis();
result.setTime(end-start);
result.setTotalDocs(multiReader.numDocs());
result.setTotalHits(docs.totalHits);
ScoreDoc[] scoreDocs=docs.scoreDocs;
ArrayList<SearchHit> hitList=new ArrayList<SearchHit>(scoreDocs.length);
for (ScoreDoc scoreDoc : scoreDocs)
{
SearchHit hit=new SearchHit();
hit.setScore(scoreDoc.score);
int docid=scoreDoc.doc;
Document doc=multiReader.document(docid);
String content=doc.get("content");
Scorer qs=new QueryScorer(q);
SimpleHTMLFormatter formatter=new SimpleHTMLFormatter("<span class=\"hl\">","</span>");
Highlighter hl=new Highlighter(formatter,qs);
String[] fragments=hl.getBestFragments(analyzer, "content",content, 1);
Map<String,String[]> fields=convert(doc);
fields.put("fragment",fragments);
hit.setFields(fields);
hitList.add(hit);
}
result.setHits(hitList.toArray(new SearchHit[hitList.size()]));
return result;
}
catch(Exception e)
{
log.error(e.getMessage(),e);
throw new ZoieException(e.getMessage(),e);
}
finally
{
try{
if (searcher!=null)
{
try {
searcher.close();
} catch (IOException e) {
log.error(e.getMessage(),e);
}
finally{
if (multiReader!=null){
try{
multiReader.close();
}
catch(IOException e){
log.error(e.getMessage(),e);
}
}
}
}
}
finally{
_idxReaderFactory.returnIndexReaders(readers);
}
}
}
}