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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 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.

Contains methods and resources useful to all classes in this package.

abstract class AbstractUserNeighborhood implements UserNeighborhood {
  private final UserSimilarity userSimilarity;
  private final DataModel dataModel;
  private final double samplingRate;
  private final RefreshHelper refreshHelper;
                           DataModel dataModel,
                           double samplingRate) {
    if (userSimilarity == null || dataModel == null) {
      throw new IllegalArgumentException("userSimilarity or dataModel is null");
    if (Double.isNaN(samplingRate) || samplingRate <= 0.0 || samplingRate > 1.0) {
      throw new IllegalArgumentException("samplingRate must be in (0,1]");
    this. = userSimilarity;
    this. = dataModel;
    this. = samplingRate;
    this. = new RefreshHelper(null);
    return ;
  final DataModel getDataModel() {
    return ;
  final double getSamplingRate() {
    return ;
  public final void refresh(Collection<RefreshablealreadyRefreshed) {
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