/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jackrabbit.core.query.lucene;
import org.apache.jackrabbit.core.query.lucene.SharedFieldComparatorSource.SimpleFieldComparator;
import org.apache.jackrabbit.spi.NameFactory;
import org.apache.jackrabbit.spi.commons.conversion.IllegalNameException;
import org.apache.jackrabbit.spi.commons.name.NameFactoryImpl;
import org.apache.lucene.search.FieldComparator;
import org.apache.lucene.search.FieldComparatorSource;
import java.io.IOException;
/**
* <code>LengthSortComparator</code> implements a <code>FieldComparator</code> which
* sorts on the length of property values.
*/
public class LengthSortComparator extends FieldComparatorSource {
/**
* The index internal namespace mappings.
*/
private final NamespaceMappings nsMappings;
public LengthSortComparator(NamespaceMappings nsMappings) {
this.nsMappings = nsMappings;
}
@Override
public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException {
NameFactory factory = NameFactoryImpl.getInstance();
try {
return new SimpleFieldComparator(nsMappings.translateName(factory.create(fieldname)), FieldNames.PROPERTY_LENGTHS, numHits);
}
catch (IllegalNameException e) {
throw Util.createIOException(e);
}
}
}