/**
* 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.mahout.cf.taste.impl.recommender;
import java.io.Serializable;
import java.util.Comparator;
import org.apache.mahout.cf.taste.recommender.RecommendedItem;
/**
* Defines a natural ordering from most-preferred item (highest value) to least-preferred.
*/
public final class ByValueRecommendedItemComparator implements Comparator<RecommendedItem>, Serializable {
private static final Comparator<RecommendedItem> INSTANCE = new ByValueRecommendedItemComparator();
public static Comparator<RecommendedItem> getInstance() {
return INSTANCE;
}
@Override
public int compare(RecommendedItem o1, RecommendedItem o2) {
float value1 = o1.getValue();
float value2 = o2.getValue();
return value1 > value2 ? -1 : value1 < value2 ? 1 : 0;
}
}