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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.
Encapsulates a simple boolean "preference" for an item whose value does not matter (is fixed at 1.0). This is appropriate in situations where users conceptually have only a general "yes" preference for items, rather than a spectrum of preference values.
public final class BooleanPreference implements PreferenceSerializable {
  private final long userID;
  private final long itemID;
  public BooleanPreference(long userIDlong itemID) {
    this. = userID;
    this. = itemID;
  public long getUserID() {
    return ;
  public long getItemID() {
    return ;
  public float getValue() {
    return 1.0f;
  public void setValue(float value) {
    throw new UnsupportedOperationException();
  public String toString() {
    return "BooleanPreference[userID: " +  + ", itemID:" +  + ']';
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