org.apache.mahout.cf.taste.impl.recommender.AbstractCandidateItemsStrategy Maven / Gradle / Ivy
/**
* 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.common.Refreshable;
import org.apache.mahout.cf.taste.common.TasteException;
import org.apache.mahout.cf.taste.impl.common.FastIDSet;
import org.apache.mahout.cf.taste.model.DataModel;
import org.apache.mahout.cf.taste.model.PreferenceArray;
import org.apache.mahout.cf.taste.recommender.CandidateItemsStrategy;
import org.apache.mahout.cf.taste.recommender.MostSimilarItemsCandidateItemsStrategy;
import java.util.Collection;
/**
* Abstract base implementation for retrieving candidate items to recommend
*/
public abstract class AbstractCandidateItemsStrategy implements CandidateItemsStrategy,
MostSimilarItemsCandidateItemsStrategy {
protected FastIDSet doGetCandidateItems(long[] preferredItemIDs, DataModel dataModel) throws TasteException{
return doGetCandidateItems(preferredItemIDs, dataModel, false);
}
@Override
public FastIDSet getCandidateItems(long userID, PreferenceArray preferencesFromUser, DataModel dataModel,
boolean includeKnownItems) throws TasteException {
return doGetCandidateItems(preferencesFromUser.getIDs(), dataModel, includeKnownItems);
}
@Override
public FastIDSet getCandidateItems(long[] itemIDs, DataModel dataModel)
throws TasteException {
return doGetCandidateItems(itemIDs, dataModel, false);
}
protected abstract FastIDSet doGetCandidateItems(long[] preferredItemIDs, DataModel dataModel,
boolean includeKnownItems) throws TasteException;
@Override
public void refresh(Collection alreadyRefreshed) {}
}