sequentialiteratortest.java

Jamon是一个Java文本模板引擎

/*
 * The contents of this file are subject to the Mozilla Public
 * License Version 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS
 * IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * rights and limitations under the License.
 *
 * The Original Code is Jamon code, released February, 2003.
 *
 * The Initial Developer of the Original Code is Ian Robertson.  Portions
 * created by Ian Robertson are Copyright (C) 2003 Ian Robertson.  All Rights
 * Reserved.
 *
 * Contributor(s):
 */

package org.jamon.codegen;

import junit.framework.TestCase;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;

public class SequentialIteratorTest
    extends TestCase
{
    public void testNoIters()
    {
        assertIterEquals(constructIterator(new String[0]),
                     new SequentialIterator<Object>(new Iterator<?>[0]));
    }

    public void testOneEmptyIter()
    {
        Iterator<String> i1 = constructIterator(new String[0]);
        assertIterEquals(i1, new SequentialIterator<Object>(new Iterator<?>[] {i1}));
    }

    public void testOneIter()
    {
        Iterator<String> i1 = constructIterator(new String[] {"one", "two"});
        assertIterEquals(i1, new SequentialIterator<Object>
            (new Iterator<?>[] {constructIterator(new String[] {"one", "two"})}));
    }

    public void testTwoIters()
    {
        Iterator<String> i1 = constructIterator(new String[] {"one", "two"});
        Iterator<String> i2 = constructIterator(new String[] {"three", "four"});
        Iterator<String> combined = constructIterator
            (new String[] {"one", "two", "three", "four"});
        assertIterEquals(combined, new SequentialIterator<String>(i1, i2));
    }

    public void testTwoItersFirstEmpty()
    {
        Iterator<String> i1 = constructIterator(new String[0]);
        Iterator<String> i2 = constructIterator(new String[] {"three", "four"});
        Iterator<String> combined = constructIterator(new String[] {"three", "four"});
        assertIterEquals(combined, new SequentialIterator<String>(i1, i2));
    }

    public void testTwoItersSecondEmpty()
    {
        Iterator<String> i1 = constructIterator(new String[] {"one", "two"});
        Iterator<String> i2 = constructIterator(new String[0]);
        Iterator<String> combined = constructIterator(new String[] {"one", "two"});
        assertIterEquals(combined, new SequentialIterator<String>(i1, i2));
    }

    public void testThreeItersSecondEmpty()
    {
        Iterator<String> i1 = constructIterator(new String[] {"one", "two"});
        Iterator<String> i2 = constructIterator(new String[0]);
        Iterator<String> i3 = constructIterator(new String[] {"three", "four"});
        Iterator<String> combined = constructIterator
            (new String[] {"one", "two", "three", "four"});
        assertIterEquals(combined, new SequentialIterator<String>(i1, i2, i3));
    }

    private static Iterator<String> constructIterator(String[] p_objs)
    {
        return Arrays.asList(p_objs).iterator();
    }

    private void assertIterEquals(Iterator<? extends Object> p_expected,
                                  Iterator<? extends Object> p_actual)
    {
        while(p_expected.hasNext())
        {
            assertTrue(p_actual.hasNext());
            assertEquals(p_expected.next(),
                         p_actual.next());
        }
        assertTrue(! p_actual.hasNext());
        try
        {
            p_actual.next();
            fail("next should have thrown an exception");
        }
        catch(NoSuchElementException e)
        {}
    }
}