/**
* 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 org.apache.mahout.cf.taste.recommender.IDRescorer;
import org.apache.mahout.cf.taste.recommender.Rescorer;
/** <p>Simple {@link Rescorer} which negates the given score, thus reversing order of rankings.</p> */
public final class ReversingRescorer<T> implements Rescorer<T>, IDRescorer {
@Override
public double rescore(T thing, double originalScore) {
return -originalScore;
}
@Override
public boolean isFiltered(T thing) {
return false;
}
@Override
public double rescore(long ID, double originalScore) {
return -originalScore;
}
@Override
public boolean isFiltered(long ID) {
return false;
}
}