collections-generic-4.01.src.test.org.apache.commons.collections15.iterators.TestArrayListIterator Maven / Gradle / Ivy
/*
* Copyright 2001-2004 The Apache Software Foundation
*
* 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.apache.commons.collections15.iterators;
import junit.framework.Test;
import junit.framework.TestSuite;
import java.util.Arrays;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.NoSuchElementException;
/**
* Test the ArrayListIterator class.
*
* @author Matt Hall, John Watkinson, Neil O'Toole
* @version $Revision: 1.1 $ $Date: 2005/10/11 19:11:58 $
*/
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
* previous()
.
*/
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());
}
}
}