/*
* Copyright (c) 2008-2017, Hazelcast, Inc. All Rights Reserved.
*
* Licensed 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 com.hazelcast.util;
import com.hazelcast.internal.serialization.impl.DefaultSerializationServiceBuilder;
import com.hazelcast.nio.serialization.Data;
import com.hazelcast.spi.serialization.SerializationService;
import com.hazelcast.test.HazelcastParallelClassRunner;
import com.hazelcast.test.HazelcastTestSupport;
import com.hazelcast.test.annotation.ParallelTest;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import static com.hazelcast.util.CollectionUtil.addToValueList;
import static com.hazelcast.util.CollectionUtil.getItemAtPositionOrNull;
import static com.hazelcast.util.CollectionUtil.isEmpty;
import static com.hazelcast.util.CollectionUtil.isNotEmpty;
import static com.hazelcast.util.CollectionUtil.objectToDataCollection;
import static com.hazelcast.util.CollectionUtil.toIntArray;
import static com.hazelcast.util.CollectionUtil.toIntegerList;
import static com.hazelcast.util.CollectionUtil.toLongArray;
import static java.util.Arrays.asList;
import static java.util.Collections.EMPTY_LIST;
import static java.util.Collections.singletonList;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.never;
import static org.mockito.Mockito.verify;
import static org.mockito.Mockito.when;
@RunWith(HazelcastParallelClassRunner.class)
@Category({QuickTest.class, ParallelTest.class})
public class CollectionUtilTest extends HazelcastTestSupport {
@Test
public void testConstructor() {
assertUtilityConstructor(CollectionUtil.class);
}
@Test
public void testIsEmpty() {
assertTrue(isEmpty(EMPTY_LIST));
assertFalse(isEmpty(singletonList(23)));
}
@Test
public void testIsNotEmpty() {
assertFalse(isNotEmpty(EMPTY_LIST));
assertTrue(isNotEmpty(singletonList(23)));
}
@Test
public void testAddToValueList() {
List<Integer> list = new ArrayList<Integer>();
list.add(23);
Map<String, List<Integer>> map = new HashMap<String, List<Integer>>();
map.put("existingKey", list);
addToValueList(map, "existingKey", 42);
assertEquals(1, map.size());
assertEquals(2, list.size());
assertContains(list, 42);
}
@Test
public void testAddToValueList_whenKeyDoesNotExist_thenNewListIsCreated() {
Map<String, List<Integer>> map = new HashMap<String, List<Integer>>();
addToValueList(map, "nonExistingKey", 42);
assertEquals(1, map.size());
List<Integer> list = map.get("nonExistingKey");
assertEquals(1, list.size());
assertContains(list, 42);
}
@Test
public void testGetItemAtPositionOrNull_whenEmptyArray_thenReturnNull() {
Collection<Object> src = new LinkedHashSet<Object>();
Object result = getItemAtPositionOrNull(src, 0);
assertNull(result);
}
@Test
public void testGetItemAtPositionOrNull_whenPositionExist_thenReturnTheItem() {
Object obj = new Object();
Collection<Object> src = new LinkedHashSet<Object>();
src.add(obj);
Object result = getItemAtPositionOrNull(src, 0);
assertSame(obj, result);
}
@Test
public void testGetItemAtPositionOrNull_whenSmallerArray_thenReturnNull() {
Object obj = new Object();
Collection<Object> src = new LinkedHashSet<Object>();
src.add(obj);
Object result = getItemAtPositionOrNull(src, 1);
assertNull(result);
}
@Test
@SuppressWarnings("unchecked")
public void testGetItemAsPositionOrNull_whenInputImplementsList_thenDoNotUserIterator() {
Object obj = new Object();
List<Object> src = mock(List.class);
when(src.size()).thenReturn(1);
when(src.get(0)).thenReturn(obj);
Object result = getItemAtPositionOrNull(src, 0);
assertSame(obj, result);
verify(src, never()).iterator();
}
@Test
public void testObjectToDataCollection_size() {
SerializationService serializationService = new DefaultSerializationServiceBuilder().build();
Collection<Object> list = new ArrayList<Object>();
list.add(1);
list.add("foo");
Collection<Data> dataCollection = objectToDataCollection(list, serializationService);
assertEquals(list.size(), dataCollection.size());
}
@Test(expected = NullPointerException.class)
public void testObjectToDataCollection_withNullItem() {
SerializationService serializationService = new DefaultSerializationServiceBuilder().build();
Collection<Object> list = new ArrayList<Object>();
list.add(null);
objectToDataCollection(list, serializationService);
}
@Test(expected = NullPointerException.class)
public void testObjectToDataCollection_withNullCollection() {
SerializationService serializationService = new DefaultSerializationServiceBuilder().build();
objectToDataCollection(null, serializationService);
}
@Test
public void testObjectToDataCollection_deserializeBack() {
SerializationService serializationService = new DefaultSerializationServiceBuilder().build();
Collection<Object> list = new ArrayList<Object>();
list.add(1);
list.add("foo");
Collection<Data> dataCollection = objectToDataCollection(list, serializationService);
Iterator<Data> it1 = dataCollection.iterator();
Iterator it2 = list.iterator();
while (it1.hasNext() && it2.hasNext()) {
assertEquals(serializationService.toObject(it1.next()), it2.next());
}
}
@Test
public void testToIntArray() {
List<Integer> list = new ArrayList<Integer>();
list.add(42);
list.add(23);
list.add(Integer.MAX_VALUE);
int[] intArray = toIntArray(list);
assertNotNull(intArray);
assertEquals(list.size(), intArray.length);
assertEquals(list.get(0).intValue(), intArray[0]);
assertEquals(list.get(1).intValue(), intArray[1]);
assertEquals(list.get(2).intValue(), intArray[2]);
}
@Test(expected = NullPointerException.class)
public void testToIntArray_whenNull_thenThrowNPE() {
toIntArray(null);
}
@Test
public void testToLongArray() {
List<Long> list = new ArrayList<Long>();
list.add(42L);
list.add(23L);
list.add(Long.MAX_VALUE);
long[] longArray = toLongArray(list);
assertNotNull(longArray);
assertEquals(list.size(), longArray.length);
assertEquals(list.get(0).longValue(), longArray[0]);
assertEquals(list.get(1).longValue(), longArray[1]);
assertEquals(list.get(2).longValue(), longArray[2]);
}
@Test(expected = NullPointerException.class)
public void testToLongArray_whenNull_thenThrowNPE() {
toLongArray(null);
}
@Test(expected = NullPointerException.class)
public void testToIntegerList_whenNull() {
toIntegerList(null);
}
@Test
public void testToIntegerList_whenEmpty() {
List<Integer> result = toIntegerList(new int[0]);
assertEquals(0, result.size());
}
@Test
public void testToIntegerList_whenNotEmpty() {
List<Integer> result = toIntegerList(new int[]{1, 2, 3, 4});
assertEquals(asList(1, 2, 3, 4), result);
}
}