/*
* 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.lucene.search.FieldComparator;
import org.apache.lucene.search.FieldComparatorSource;
import java.io.IOException;
/**
* <code>UpperCaseSortComparator</code> implements a <code>FieldComparator</code> which
* compares the upper-cased string values of a base sort comparator.
*/
public class UpperCaseSortComparator extends FieldComparatorSource {
/**
* The base sort comparator.
*/
private final FieldComparatorSource base;
/**
* Creates a new upper case sort comparator.
*
* @param base the base sort comparator source.
*/
public UpperCaseSortComparator(FieldComparatorSource base) {
this.base = base;
}
@Override
public FieldComparator newComparator(String fieldname, int numHits, int sortPos, boolean reversed) throws IOException {
FieldComparator comparator = base.newComparator(fieldname, numHits, sortPos, reversed);
assert comparator instanceof FieldComparatorBase;
return new FieldComparatorDecorator((FieldComparatorBase) comparator) {
@Override
protected Comparable sortValue(int doc) {
Comparable c = super.sortValue(doc);
return c == null ? null : c.toString().toUpperCase();
}
};
}
}