/*
* 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.collections.iterators;
import java.util.ListIterator;
import java.util.NoSuchElementException;
import junit.framework.Test;
import junit.framework.TestSuite;
import org.apache.commons.collections.ResettableListIterator;
/**
* Tests the SingletonListIterator.
*
* @version $Revision: 1.11 $ $Date: 2004/02/18 01:20:33 $
*
* @author Stephen Colebourne
*/
public class TestSingletonListIterator extends AbstractTestListIterator {
private static final Object testValue = "foo";
public static Test suite() {
return new TestSuite(TestSingletonListIterator.class);
}
public TestSingletonListIterator(String testName) {
super(testName);
}
/**
* Returns a SingletonListIterator from which
* the element has already been removed.
*/
public ListIterator makeEmptyListIterator() {
SingletonListIterator iter = (SingletonListIterator)makeFullIterator();
iter.next();
iter.remove();
iter.reset();
return iter;
}
public ListIterator makeFullListIterator() {
return new SingletonListIterator( testValue );
}
public boolean supportsAdd() {
return false;
}
public boolean supportsRemove() {
return true;
}
public boolean supportsEmptyIterator() {
return true;
}
public void testIterator() {
ListIterator iter = (ListIterator) makeObject();
assertTrue( "Iterator should have next item", iter.hasNext() );
assertTrue( "Iterator should have no previous item", !iter.hasPrevious() );
assertEquals( "Iteration next index", 0, iter.nextIndex() );
assertEquals( "Iteration previous index", -1, iter.previousIndex() );
Object iterValue = iter.next();
assertEquals( "Iteration value is correct", testValue, iterValue );
assertTrue( "Iterator should have no next item", !iter.hasNext() );
assertTrue( "Iterator should have previous item", iter.hasPrevious() );
assertEquals( "Iteration next index", 1, iter.nextIndex() );
assertEquals( "Iteration previous index", 0, iter.previousIndex() );
iterValue = iter.previous();
assertEquals( "Iteration value is correct", testValue, iterValue );
assertTrue( "Iterator should have next item", iter.hasNext() );
assertTrue( "Iterator should have no previous item", !iter.hasPrevious() );
assertEquals( "Iteration next index", 0, iter.nextIndex() );
assertEquals( "Iteration previous index", -1, iter.previousIndex() );
iterValue = iter.next();
assertEquals( "Iteration value is correct", testValue, iterValue );
assertTrue( "Iterator should have no next item", !iter.hasNext() );
assertTrue( "Iterator should have previous item", iter.hasPrevious() );
assertEquals( "Iteration next index", 1, iter.nextIndex() );
assertEquals( "Iteration previous index", 0, iter.previousIndex() );
try {
iter.next();
} catch (Exception e) {
assertTrue("NoSuchElementException must be thrown",
e.getClass().equals((new NoSuchElementException()).getClass()));
}
iter.previous();
try {
iter.previous();
} catch (Exception e) {
assertTrue("NoSuchElementException must be thrown",
e.getClass().equals((new NoSuchElementException()).getClass()));
}
}
public void testReset() {
ResettableListIterator it = (ResettableListIterator) makeObject();
assertEquals(true, it.hasNext());
assertEquals(false, it.hasPrevious());
assertEquals(testValue, it.next());
assertEquals(false, it.hasNext());
assertEquals(true, it.hasPrevious());
it.reset();
assertEquals(true, it.hasNext());
assertEquals(false, it.hasPrevious());
assertEquals(testValue, it.next());
assertEquals(false, it.hasNext());
assertEquals(true, it.hasPrevious());
it.reset();
it.reset();
assertEquals(true, it.hasNext());
}
}