/*
* 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.elasticsearch.impl;
import java.io.IOException;
import org.apache.lucene.search.TopDocs;
import org.hibernate.search.elasticsearch.logging.impl.Log;
import org.hibernate.search.query.engine.spi.DocumentExtractor;
import org.hibernate.search.query.engine.spi.EntityInfo;
import org.hibernate.search.util.logging.impl.LoggerFactory;
/**
* @author Yoann Rodiere
*/
class EmptyDocumentExtractor implements DocumentExtractor {
private static final Log log = LoggerFactory.make( Log.class );
private static final DocumentExtractor INSTANCE = new EmptyDocumentExtractor();
public static DocumentExtractor get() {
return INSTANCE;
}
private EmptyDocumentExtractor() {
// Use get()
}
@Override
public EntityInfo extract(int index) throws IOException {
throw new IndexOutOfBoundsException( "This document extractor is empty" );
}
@Override
public int getFirstIndex() {
return 0;
}
@Override
public int getMaxIndex() {
return -1;
}
@Override
public void close() {
// Nothing to do
}
@Override
public TopDocs getTopDocs() {
throw log.documentExtractorTopDocsUnsupported();
}
}