/**
* 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.recommender;
import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.cf.taste.impl.common.FastIDSet;
/**
* <p>
* Interface implemented by "clustering" recommenders.
* </p>
*/
public interface ClusteringRecommender extends Recommender {
/**
* <p>
* Returns the cluster of users to which the given user, denoted by user ID, belongs.
* </p>
*
* @param userID
* user ID for which to find a cluster
* @return {@link FastIDSet} of IDs of users in the requested user's cluster
* @throws TasteException
* if an error occurs while accessing the {@link org.apache.mahout.cf.taste.model.DataModel}
*/
FastIDSet getCluster(long userID) throws TasteException;
/**
* <p>
* Returns all clusters of users.
* </p>
*
* @return array of {@link FastIDSet}s of user IDs
* @throws TasteException
* if an error occurs while accessing the {@link org.apache.mahout.cf.taste.model.DataModel}
*/
FastIDSet[] getClusters() throws TasteException;
}