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Commons Collections example source code file (TestSingletonListIterator.java)

This example Commons Collections source code file (TestSingletonListIterator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons Collections tags/keywords

exception, iteration, iteration, iterator, iterator, listiterator, listiterator, nosuchelementexception, object, resettablelistiterator, singletonlistiterator, singletonlistiterator, test, testsingletonlistiterator, util

The Commons Collections TestSingletonListIterator.java source code

/*
 *  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.ListIterator;
import java.util.NoSuchElementException;

import junit.framework.Test;
import junit.framework.TestSuite;

import org.apache.commons.collections.ResettableListIterator;

/**
 * Tests the SingletonListIterator.
 *
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @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());
    }
    
}

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