/*
* 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.commons.collections.iterators;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.NoSuchElementException;
import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
/**
* Tests the LoopingIterator class.
*
* @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
*
* @author Jonathan Carlson
* @author Stephen Colebourne
*/
public class TestLoopingIterator extends TestCase {
public TestLoopingIterator(String testName) {
super(testName);
}
public static Test suite() {
return new TestSuite(TestLoopingIterator.class);
}
/**
* Tests constructor exception.
*/
public void testConstructorEx() throws Exception {
try {
new LoopingIterator(null);
fail();
} catch (NullPointerException ex) {
}
}
/**
* Tests whether an empty looping iterator works as designed.
* @throws Exception If something unexpected occurs.
*/
public void testLooping0() throws Exception {
List list = new ArrayList();
LoopingIterator loop = new LoopingIterator(list);
assertTrue("hasNext should return false", loop.hasNext() == false);
try {
loop.next();
fail("NoSuchElementException was not thrown during next() call.");
} catch (NoSuchElementException ex) {
}
}
/**
* Tests whether a populated looping iterator works as designed.
* @throws Exception If something unexpected occurs.
*/
public void testLooping1() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a" }));
LoopingIterator loop = new LoopingIterator(list);
assertTrue("1st hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
assertTrue("2nd hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
assertTrue("3rd hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
}
/**
* Tests whether a populated looping iterator works as designed.
* @throws Exception If something unexpected occurs.
*/
public void testLooping2() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a", "b" }));
LoopingIterator loop = new LoopingIterator(list);
assertTrue("1st hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
assertTrue("2nd hasNext should return true", loop.hasNext());
assertEquals("b", loop.next());
assertTrue("3rd hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
}
/**
* Tests whether a populated looping iterator works as designed.
* @throws Exception If something unexpected occurs.
*/
public void testLooping3() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a", "b", "c" }));
LoopingIterator loop = new LoopingIterator(list);
assertTrue("1st hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
assertTrue("2nd hasNext should return true", loop.hasNext());
assertEquals("b", loop.next());
assertTrue("3rd hasNext should return true", loop.hasNext());
assertEquals("c", loop.next());
assertTrue("4th hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
}
/**
* Tests the remove() method on a LoopingIterator wrapped ArrayList.
* @throws Exception If something unexpected occurs.
*/
public void testRemoving1() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a", "b", "c" }));
LoopingIterator loop = new LoopingIterator(list);
assertEquals("list should have 3 elements.", 3, list.size());
assertTrue("1st hasNext should return true", loop.hasNext());
assertEquals("a", loop.next());
loop.remove(); // removes a
assertEquals("list should have 2 elements.", 2, list.size());
assertTrue("2nd hasNext should return true", loop.hasNext());
assertEquals("b", loop.next());
loop.remove(); // removes b
assertEquals("list should have 1 elements.", 1, list.size());
assertTrue("3rd hasNext should return true", loop.hasNext());
assertEquals("c", loop.next());
loop.remove(); // removes c
assertEquals("list should have 0 elements.", 0, list.size());
assertTrue("4th hasNext should return false", loop.hasNext() == false);
try {
loop.next();
fail("Expected NoSuchElementException to be thrown.");
} catch (NoSuchElementException ex) {
}
}
/**
* Tests the reset() method on a LoopingIterator wrapped ArrayList.
* @throws Exception If something unexpected occurs.
*/
public void testReset() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a", "b", "c" }));
LoopingIterator loop = new LoopingIterator(list);
assertEquals("a", loop.next());
assertEquals("b", loop.next());
loop.reset();
assertEquals("a", loop.next());
loop.reset();
assertEquals("a", loop.next());
assertEquals("b", loop.next());
assertEquals("c", loop.next());
loop.reset();
assertEquals("a", loop.next());
assertEquals("b", loop.next());
assertEquals("c", loop.next());
}
/**
* Tests the size() method on a LoopingIterator wrapped ArrayList.
* @throws Exception If something unexpected occurs.
*/
public void testSize() throws Exception {
List list = new ArrayList(Arrays.asList(new String[] { "a", "b", "c" }));
LoopingIterator loop = new LoopingIterator(list);
assertEquals(3, loop.size());
loop.next();
loop.next();
assertEquals(3, loop.size());
loop.reset();
assertEquals(3, loop.size());
loop.next();
loop.remove();
assertEquals(2, loop.size());
}
}