/*
* 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.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import junit.framework.Test;
import junit.framework.TestSuite;
import org.apache.commons.collections.IteratorUtils;
import org.apache.commons.collections.Predicate;
/**
* Tests the IteratorChain class.
*
* @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
*
* @author James Strachan
* @author Mauricio S. Moura
* @author Morgan Delagrange
*/
public class TestIteratorChain extends AbstractTestIterator {
protected String[] testArray = {
"One", "Two", "Three", "Four", "Five", "Six"
};
protected List list1 = null;
protected List list2 = null;
protected List list3 = null;
public static Test suite() {
return new TestSuite(TestIteratorChain.class);
}
public TestIteratorChain(String testName) {
super(testName);
}
public void setUp() {
list1 = new ArrayList();
list1.add("One");
list1.add("Two");
list1.add("Three");
list2 = new ArrayList();
list2.add("Four");
list3 = new ArrayList();
list3.add("Five");
list3.add("Six");
}
public Iterator makeEmptyIterator() {
ArrayList list = new ArrayList();
return new IteratorChain(list.iterator());
}
public Iterator makeFullIterator() {
IteratorChain chain = new IteratorChain();
chain.addIterator(list1.iterator());
chain.addIterator(list2.iterator());
chain.addIterator(list3.iterator());
return chain;
}
public void testIterator() {
Iterator iter = (Iterator) makeFullIterator();
for ( int i = 0; i < testArray.length; i++ ) {
Object testValue = testArray[i];
Object iterValue = iter.next();
assertEquals( "Iteration value is correct", testValue, iterValue );
}
assertTrue("Iterator should now be empty", ! iter.hasNext() );
try {
Object testValue = iter.next();
} catch (Exception e) {
assertTrue("NoSuchElementException must be thrown",
e.getClass().equals((new NoSuchElementException()).getClass()));
}
}
public void testRemoveFromFilteredIterator() {
final Predicate myPredicate = new Predicate() {
public boolean evaluate( Object object ) {
Integer i = (Integer) object;
if (i.compareTo(new Integer(4)) < 0)
return true;
return false;
}
};
List list1 = new ArrayList();
List list2 = new ArrayList();
list1.add(new Integer(1));
list1.add(new Integer(2));
list2.add(new Integer(3));
list2.add(new Integer(4)); // will be ignored by the predicate
Iterator it1 = IteratorUtils.filteredIterator(list1.iterator(), myPredicate );
Iterator it2 = IteratorUtils.filteredIterator(list2.iterator(), myPredicate );
Iterator it = IteratorUtils.chainedIterator(it1, it2);
while (it.hasNext()) {
it.next();
it.remove();
}
assertEquals( 0, list1.size() );
assertEquals( 1, list2.size() );
}
public void testRemove() {
Iterator iter = (Iterator) makeFullIterator();
try {
iter.remove();
fail("Calling remove before the first call to next() should throw an exception");
} catch (IllegalStateException e) {
}
for ( int i = 0; i < testArray.length; i++ ) {
Object testValue = testArray[i];
Object iterValue = iter.next();
assertEquals( "Iteration value is correct", testValue, iterValue );
if (! iterValue.equals("Four")) {
iter.remove();
}
}
assertTrue("List is empty",list1.size() == 0);
assertTrue("List is empty",list2.size() == 1);
assertTrue("List is empty",list3.size() == 0);
}
public void testFirstIteratorIsEmptyBug() {
List empty = new ArrayList();
List notEmpty = new ArrayList();
notEmpty.add("A");
notEmpty.add("B");
notEmpty.add("C");
IteratorChain chain = new IteratorChain();
chain.addIterator(empty.iterator());
chain.addIterator(notEmpty.iterator());
assertTrue("should have next",chain.hasNext());
assertEquals("A",chain.next());
assertTrue("should have next",chain.hasNext());
assertEquals("B",chain.next());
assertTrue("should have next",chain.hasNext());
assertEquals("C",chain.next());
assertTrue("should not have next",!chain.hasNext());
}
public void testEmptyChain() {
IteratorChain chain = new IteratorChain();
assertEquals(false, chain.hasNext());
try {
chain.next();
fail();
} catch (NoSuchElementException ex) {}
try {
chain.remove();
fail();
} catch (IllegalStateException ex) {}
}
}