testiterator.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 *
 * $Id: TestIterator.java,v 1.1 2003/07/07 10:30:29 per_nyfelt Exp $
 */

package test.dom4j;

import junit.framework.Test;
import junit.framework.TestSuite;
import junit.textui.TestRunner;
import org.dom4j.Document;
import org.dom4j.Element;

import java.util.Iterator;
import java.util.List;


/** A test harness to test the Iterator API in DOM4J
  *
  * @author <a href="mailto:jdoughty@[e-mail]">Jonathan Doughty</a>
  * @version $Revision: 1.1 $
  */
public class TestIterator extends AbstractTestCase {

    protected Document iterDocument;
    private static final int NUMELE = 10;

    public static void main( String[] args ) {
        TestRunner.run( suite() );
    }

    public static Test suite() {
        return new TestSuite( TestIterator.class );
    }

    public TestIterator(String name) {
        super(name);
    }

    protected void setUp() throws Exception {
        iterDocument = createDocument();

        Element root = iterDocument.addElement( "root" );

        for (int i = 0; i < NUMELE; i++) {
            root.addElement( "iterator test")
                .addAttribute( "instance", Integer.toString(i));
        }
    }

    // Test case(s)
    //-------------------------------------------------------------------------

    public void testElementCount() throws Exception {
        Element root = iterDocument.getRootElement();
        assertTrue( "Has root element", root != null );

        List elements = root.elements( "iterator test" );
        int elementSize = elements.size();
        assertTrue( "Root has " + elementSize + " children",
                    elements != null && elementSize == NUMELE );

    }

    public void testPlainIteration() throws Exception {
        Element root = iterDocument.getRootElement();
        List elements = root.elements( "iterator test" );
        Iterator iter = root.elementIterator( "iterator test" );
        int elementSize = elements.size();

        int count = 0;
        for (; iter.hasNext();) {
            Element e = (Element) iter.next();
            assertTrue("instance " + e.attribute("instance").getValue() +
                       " equals "+ count,
                       e.attribute("instance").getValue().equals(
                           Integer.toString(count)));
            count++;
        }

        assertTrue( elementSize + " elements iterated", count == elementSize );
    }

    public void testSkipAlternates() throws Exception {
        Element root = iterDocument.getRootElement();
        List elements = root.elements( "iterator test" );
        Iterator iter = root.elementIterator( "iterator test" );
        int elementSize = elements.size();
        int count = 0;
        for (; iter.hasNext();) {
            Element e = (Element) iter.next();
            assertTrue("instance " + e.attribute("instance").getValue() +
                       " equals "+ count*2,
                       e.attribute("instance").getValue().equals(
                           Integer.toString(count*2)));
            iter.next();
            count++;
        }
        assertTrue( (elementSize/2) + " alternate elements iterated",
                    count == (elementSize/2) );
    }

    public void testNoHasNext() throws Exception {
        Element root = iterDocument.getRootElement();
        List elements = root.elements( "iterator test" );
        Iterator iter = root.elementIterator( "iterator test" );
        int elementSize = elements.size();
        int count = 0;
        Element e = null;
        for (; count < elementSize; ) {
            e = (Element) iter.next();
            assertTrue("instance " + e.attribute("instance").getValue() +
                       " equals "+ count,
                       e.attribute("instance").getValue().equals(
                           Integer.toString(count)));
            System.out.println("instance " +
                               e.attribute("instance").getValue() +
                               " equals "+ count);
            count++;
        }
        try {
            e = (Element) iter.next();
            if (e != null) {
                // Real Iterators wouldn't get here
                assertTrue( "no more elements,value instead is " +
                            e.attribute("instance").getValue(), e == null);
            }
        }
        catch (Exception exp) {
            assertTrue( "Real iterators throw NoSuchElementException",
                        exp instanceof java.util.NoSuchElementException);
        }
    }

    public void testExtraHasNexts() throws Exception {
        Element root = iterDocument.getRootElement();
        List elements = root.elements( "iterator test" );
        Iterator iter = root.elementIterator( "iterator test" );
        int elementSize = elements.size();
        int count = 0;
        for (; iter.hasNext();) {
            Element e = (Element) iter.next();
            assertTrue("instance " + e.attribute("instance").getValue() +
                       " equals "+ count,
                       e.attribute("instance").getValue().equals(
                           Integer.toString(count)));
            iter.hasNext();
            count++;
        }
        assertTrue( elementSize + " elements iterated with extra hasNexts",
                    count == elementSize );
    }
}




/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "DOM4J" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of MetaStuff, Ltd.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "DOM4J"
 *    nor may "DOM4J" appear in their names without prior written
 *    permission of MetaStuff, Ltd. DOM4J is a registered
 *    trademark of MetaStuff, Ltd.
 *
 * 5. Due credit should be given to the DOM4J Project
 *    (http://dom4j.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: TestIterator.java,v 1.1 2003/07/07 10:30:29 per_nyfelt Exp $
 */