/**
* 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.model;
import org.apache.mahout.cf.taste.impl.TasteTestCase;
import org.apache.mahout.cf.taste.model.PreferenceArray;
import org.junit.Test;
public final class GenericUserPreferenceArrayTest extends TasteTestCase {
@Test
public void testUserID() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
assertEquals(3, prefs.length());
prefs.setUserID(0, 1L);
assertEquals(1L, prefs.getUserID(0));
assertEquals(1L, prefs.getUserID(1));
assertEquals(1L, prefs.getUserID(2));
}
@Test
public void testItemID() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
assertEquals(3, prefs.length());
prefs.setItemID(0, 1L);
prefs.setItemID(1, 2L);
prefs.setItemID(2, 3L);
assertEquals(1L, prefs.getItemID(0));
assertEquals(2L, prefs.getItemID(1));
assertEquals(3L, prefs.getItemID(2));
}
@Test
public void testSetValue() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
assertEquals(3, prefs.length());
prefs.setValue(0, 1.0f);
prefs.setValue(1, 2.0f);
prefs.setValue(2, 3.0f);
assertEquals(1.0f, prefs.getValue(0), EPSILON);
assertEquals(2.0f, prefs.getValue(1), EPSILON);
assertEquals(3.0f, prefs.getValue(2), EPSILON);
}
@Test
public void testHasPref() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
assertTrue(prefs.hasPrefWithItemID(3L));
assertTrue(prefs.hasPrefWithUserID(1L));
assertFalse(prefs.hasPrefWithItemID(2L));
assertFalse(prefs.hasPrefWithUserID(2L));
}
@Test
public void testSort() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
prefs.set(1, new GenericPreference(1L, 1L, 5.0f));
prefs.set(2, new GenericPreference(1L, 2L, 5.0f));
prefs.sortByItem();
assertEquals(1L, prefs.getItemID(0));
assertEquals(2L, prefs.getItemID(1));
assertEquals(3L, prefs.getItemID(2));
}
@Test
public void testSortValue() {
PreferenceArray prefs = new GenericUserPreferenceArray(3);
prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
prefs.set(1, new GenericPreference(1L, 1L, 4.0f));
prefs.set(2, new GenericPreference(1L, 2L, 3.0f));
prefs.sortByValue();
assertEquals(2L, prefs.getItemID(0));
assertEquals(1L, prefs.getItemID(1));
assertEquals(3L, prefs.getItemID(2));
prefs.sortByValueReversed();
assertEquals(3L, prefs.getItemID(0));
assertEquals(1L, prefs.getItemID(1));
assertEquals(2L, prefs.getItemID(2));
}
@Test
public void testClone() {
GenericUserPreferenceArray prefs = new GenericUserPreferenceArray(3);
prefs.set(0, new GenericPreference(1L, 3L, 5.0f));
prefs.set(1, new GenericPreference(1L, 1L, 4.0f));
prefs.set(2, new GenericPreference(1L, 2L, 3.0f));
prefs = prefs.clone();
assertEquals(3L, prefs.getItemID(0));
assertEquals(1L, prefs.getUserID(1));
assertEquals(3.0f, prefs.getValue(2), EPSILON);
}
}