/*
* Copyright 2002-2016 the original author or authors.
*
* 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 org.springframework.util;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import org.junit.Test;
import static org.junit.Assert.*;
/**
* Test case for {@link CompositeIterator}.
*
* @author Erwin Vervaet
* @author Juergen Hoeller
*/
public class CompositeIteratorTests {
@Test
public void testNoIterators() {
CompositeIterator<String> it = new CompositeIterator<>();
assertFalse(it.hasNext());
try {
it.next();
fail();
}
catch (NoSuchElementException ex) {
// expected
}
}
@Test
public void testSingleIterator() {
CompositeIterator<String> it = new CompositeIterator<>();
it.add(Arrays.asList("0", "1").iterator());
for (int i = 0; i < 2; i++) {
assertTrue(it.hasNext());
assertEquals(String.valueOf(i), it.next());
}
assertFalse(it.hasNext());
try {
it.next();
fail();
}
catch (NoSuchElementException ex) {
// expected
}
}
@Test
public void testMultipleIterators() {
CompositeIterator<String> it = new CompositeIterator<>();
it.add(Arrays.asList("0", "1").iterator());
it.add(Arrays.asList("2").iterator());
it.add(Arrays.asList("3", "4").iterator());
for (int i = 0; i < 5; i++) {
assertTrue(it.hasNext());
assertEquals(String.valueOf(i), it.next());
}
assertFalse(it.hasNext());
try {
it.next();
fail();
}
catch (NoSuchElementException ex) {
// expected
}
}
@Test
public void testInUse() {
List<String> list = Arrays.asList("0", "1");
CompositeIterator<String> it = new CompositeIterator<>();
it.add(list.iterator());
it.hasNext();
try {
it.add(list.iterator());
fail();
}
catch (IllegalStateException ex) {
// expected
}
it = new CompositeIterator<>();
it.add(list.iterator());
it.next();
try {
it.add(list.iterator());
fail();
}
catch (IllegalStateException ex) {
// expected
}
}
@Test
public void testDuplicateIterators() {
List<String> list = Arrays.asList("0", "1");
Iterator<String> iterator = list.iterator();
CompositeIterator<String> it = new CompositeIterator<>();
it.add(iterator);
it.add(list.iterator());
try {
it.add(iterator);
fail();
}
catch (IllegalArgumentException ex) {
// expected
}
}
}