/**
* 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.example.netflix;
import org.apache.mahout.cf.taste.model.Item;
import org.apache.mahout.cf.taste.impl.common.FileLineIterable;
import java.util.List;
import java.util.ArrayList;
import java.io.File;
final class NetflixMovie implements Item {
private final Integer id;
private final String title;
NetflixMovie(Integer id, String title) {
if (id == null || title == null) {
throw new IllegalArgumentException("ID or title is null");
}
this.id = id;
this.title = title;
}
@Override
public Object getID() {
return id;
}
String getTitle() {
return title;
}
@Override
public boolean isRecommendable() {
return true;
}
@Override
public int hashCode() {
return id.hashCode();
}
@Override
public boolean equals(Object obj) {
return obj instanceof NetflixMovie && ((NetflixMovie) obj).id.equals(id);
}
@Override
public int compareTo(Item item) {
return this.id.compareTo(((NetflixMovie) item).id);
}
@Override
public String toString() {
return id + ":" + title;
}
static List<NetflixMovie> readMovies(File dataDirectory) {
List<NetflixMovie> movies = new ArrayList<NetflixMovie>(17770);
for (String line : new FileLineIterable(new File(dataDirectory, "movie_titles.txt"), false)) {
int firstComma = line.indexOf((int) ',');
int id = Integer.parseInt(line.substring(0, firstComma));
int secondComma = line.indexOf((int) ',', firstComma + 1);
String title = line.substring(secondComma + 1);
movies.add(new NetflixMovie(id, title));
if (id != movies.size()) {
throw new IllegalStateException("A movie is missing from movie_titles.txt");
}
}
return movies;
}
}