/*
* Hibernate Search, full-text search for your domain model
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
*/
package org.hibernate.search.reader.impl;
import java.io.IOException;
import org.apache.lucene.index.IndexReader;
import org.hibernate.search.indexes.spi.IndexManager;
import org.hibernate.search.indexes.spi.ReaderProvider;
import org.hibernate.search.util.logging.impl.Log;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* Creates and closes the IndexReaders encompassing multiple indexes.
*
* @author Sanne Grinovero <sanne@hibernate.org> (C) 2011 Red Hat Inc.
*/
public final class MultiReaderFactory {
private static final Log log = LoggerFactory.make();
private MultiReaderFactory() {
//not allowed
}
public static IndexReader openReader(IndexManager... indexManagers) {
final int length = indexManagers.length;
IndexReader[] readers = new IndexReader[length];
ReaderProvider[] managers = new ReaderProvider[length];
for ( int index = 0; index < length; index++ ) {
ReaderProvider indexReaderManager = indexManagers[index].getReaderProvider();
IndexReader openIndexReader = indexReaderManager.openIndexReader();
readers[index] = openIndexReader;
managers[index] = indexReaderManager;
}
if ( length == 0 ) {
return null;
}
else {
//everything should be the same so wrap in an MultiReader
return new ManagedMultiReader( readers, managers );
}
}
public static void closeReader(IndexReader multiReader) {
if ( multiReader == null ) {
return;
}
try {
//This used to be more complex, complexity is now hidden into
//org.hibernate.search.reader.impl.ManagedMultiReader#doClose()
multiReader.close();
}
catch (IOException e) {
//The implementation of IndexReader we use would actually never throw
//an IOException, so just in case user is passing a custom IndexReader.
log.couldNotCloseResource( e );
}
}
}