/**
* Searches pages using a particular combination of flags.
*
* @param query The query to perform in Lucene query language
* @param flags A set of flags
* @return A Collection of SearchResult instances
* @throws ProviderException if there is a problem with the backend
*/
public Collection findPages(String query, int flags) throws ProviderException {
IndexSearcher searcher = null;
ArrayList<SearchResult> list = null;
Highlighter highlighter = null;
try {
String[] queryfields = {
LUCENE_PAGE_CONTENTS, LUCENE_PAGE_NAME, LUCENE_AUTHOR, LUCENE_ATTACHMENTS
};
QueryParser qp =
new MultiFieldQueryParser(Version.LUCENE_36, queryfields, getLuceneAnalyzer());
// QueryParser qp = new QueryParser( LUCENE_PAGE_CONTENTS, getLuceneAnalyzer() );
Query luceneQuery = qp.parse(query);
if ((flags & FLAG_CONTEXTS) != 0) {
highlighter =
new Highlighter(
new SimpleHTMLFormatter("<span class=\"searchmatch\">", "</span>"),
new SimpleHTMLEncoder(),
new QueryScorer(luceneQuery));
}
try {
File dir = new File(m_luceneDirectory);
Directory luceneDir = new SimpleFSDirectory(dir, null);
IndexReader reader = IndexReader.open(luceneDir);
searcher = new IndexSearcher(reader);
} catch (Exception ex) {
log.info("Lucene not yet ready; indexing not started", ex);
return null;
}
ScoreDoc[] hits = searcher.search(luceneQuery, MAX_SEARCH_HITS).scoreDocs;
list = new ArrayList<SearchResult>(hits.length);
for (int curr = 0; curr < hits.length; curr++) {
int docID = hits[curr].doc;
Document doc = searcher.doc(docID);
String pageName = doc.get(LUCENE_ID);
WikiPage page = m_engine.getPage(pageName, WikiPageProvider.LATEST_VERSION);
if (page != null) {
if (page instanceof Attachment) {
// Currently attachments don't look nice on the search-results page
// When the search-results are cleaned up this can be enabled again.
}
int score = (int) (hits[curr].score * 100);
// Get highlighted search contexts
String text = doc.get(LUCENE_PAGE_CONTENTS);
String[] fragments = new String[0];
if (text != null && highlighter != null) {
TokenStream tokenStream =
getLuceneAnalyzer().tokenStream(LUCENE_PAGE_CONTENTS, new StringReader(text));
fragments = highlighter.getBestFragments(tokenStream, text, MAX_FRAGMENTS);
}
SearchResult result = new SearchResultImpl(page, score, fragments);
list.add(result);
} else {
log.error(
"Lucene found a result page '"
+ pageName
+ "' that could not be loaded, removing from Lucene cache");
pageRemoved(new WikiPage(m_engine, pageName));
}
}
} catch (IOException e) {
log.error("Failed during lucene search", e);
} catch (ParseException e) {
log.info("Broken query; cannot parse query ", e);
throw new ProviderException(
"You have entered a query Lucene cannot process: " + e.getMessage());
} catch (InvalidTokenOffsetsException e) {
log.error("Tokens are incompatible with provided text ", e);
} finally {
if (searcher != null) {
try {
searcher.close();
} catch (IOException e) {
log.error(e);
}
}
}
return list;
}