/*
* 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.Arrays;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import junit.framework.Test;
import junit.framework.TestSuite;
/**
* Test the ArrayListIterator class.
*
* @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
* @author Neil O'Toole
*/
public class TestArrayListIterator extends TestArrayIterator {
public TestArrayListIterator(String testName) {
super(testName);
}
public static Test suite() {
return new TestSuite(TestArrayListIterator.class);
}
public Iterator makeEmptyIterator() {
return new ArrayListIterator(new Object[0]);
}
public Iterator makeFullIterator() {
return new ArrayListIterator(testArray);
}
public ListIterator makeArrayListIterator(Object array) {
return new ArrayListIterator(array);
}
public boolean supportsRemove() {
return false;
}
/**
* Test the basic ListIterator functionality - going backwards using
* <code>previous()</code>.
*/
public void testListIterator() {
ListIterator iter = (ListIterator) makeFullIterator();
// TestArrayIterator#testIterator() has already tested the iterator forward,
// now we need to test it in reverse
// fast-forward the iterator to the end...
while (iter.hasNext()) {
iter.next();
}
for (int x = testArray.length - 1; x >= 0; x--) {
Object testValue = testArray[x];
Object iterValue = iter.previous();
assertEquals("Iteration value is correct", testValue, iterValue);
}
assertTrue("Iterator should now be empty", !iter.hasPrevious());
try {
Object testValue = iter.previous();
} catch (Exception e) {
assertTrue(
"NoSuchElementException must be thrown",
e.getClass().equals((new NoSuchElementException()).getClass()));
}
}
/**
* Tests the {@link java.util.ListIterator#set} operation.
*/
public void testListIteratorSet() {
String[] testData = new String[] { "a", "b", "c" };
String[] result = new String[] { "0", "1", "2" };
ListIterator iter = (ListIterator) makeArrayListIterator(testData);
int x = 0;
while (iter.hasNext()) {
iter.next();
iter.set(Integer.toString(x));
x++;
}
assertTrue("The two arrays should have the same value, i.e. {0,1,2}", Arrays.equals(testData, result));
// a call to set() before a call to next() or previous() should throw an IllegalStateException
iter = makeArrayListIterator(testArray);
try {
iter.set("should fail");
fail("ListIterator#set should fail if next() or previous() have not yet been called.");
} catch (IllegalStateException e) {
// expected
} catch (Throwable t) { // should never happen
fail(t.toString());
}
}
}