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The source code/* * 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.ArrayList; import java.util.Iterator; import java.util.List; import java.util.NoSuchElementException; import junit.framework.Test; import junit.framework.TestSuite; /** * Tests the IteratorChain class. * * @version $Revision: 1.9 $ $Date: 2004/02/18 01:20:33 $ * * @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 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) {} } } |
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