IteratorTest xref

    1   /*
    2    * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    3    *
    4    * This software is open source.
    5    * See the bottom of this file for the licence.
    6    */
    7
    8   package org.dom4j;
    9
    10  import junit.textui.TestRunner;
    11
    12  import java.util.Iterator;
    13  import java.util.List;
    14
    15  /***
    16   * A test harness to test the Iterator API in DOM4J
    17   *
    18   * @author <a href="mailto:jdoughty@jdoughty@cs.gmu.edu">Jonathan Doughty </a>
    19   * @version $Revision: 1.4 $
    20   */
    21  public class IteratorTest extends AbstractTestCase {
    22      private static final int NUMELE = 10;
    23
    24      protected Document iterDocument;
    25
    26      public static void main(String[] args) {
    27          TestRunner.run(IteratorTest.class);
    28      }
    29
    30      protected void setUp() throws Exception {
    31          super.setUp();
    32          iterDocument = DocumentHelper.createDocument();
    33
    34          Element root = iterDocument.addElement("root");
    35
    36          for (int i = 0; i < NUMELE; i++) {
    37              root.addElement("iterator test").addAttribute("instance",
    38                      Integer.toString(i));
    39          }
    40      }
    41
    42      // Test case(s)
    43      // -------------------------------------------------------------------------
    44      public void testElementCount() throws Exception {
    45          Element root = iterDocument.getRootElement();
    46          assertTrue("Has root element", root != null);
    47
    48          List elements = root.elements("iterator test");
    49          int elementSize = elements.size();
    50          assertTrue("Root has " + elementSize + " children", (elements != null)
    51                  && (elementSize == NUMELE));
    52      }
    53
    54      public void testPlainIteration() throws Exception {
    55          Element root = iterDocument.getRootElement();
    56          List elements = root.elements("iterator test");
    57          Iterator iter = root.elementIterator("iterator test");
    58          int elementSize = elements.size();
    59
    60          int count = 0;
    61
    62          for (; iter.hasNext();) {
    63              Element e = (Element) iter.next();
    64              assertEquals("instance " + e.attribute("instance").getValue()
    65                      + " equals " + count, e.attribute("instance").getValue(),
    66                      Integer.toString(count));
    67              count++;
    68          }
    69
    70          assertTrue(elementSize + " elements iterated", count == elementSize);
    71      }
    72
    73      public void testSkipAlternates() throws Exception {
    74          Element root = iterDocument.getRootElement();
    75          List elements = root.elements("iterator test");
    76          Iterator iter = root.elementIterator("iterator test");
    77          int elementSize = elements.size();
    78          int count = 0;
    79
    80          for (; iter.hasNext();) {
    81              Element e = (Element) iter.next();
    82              assertEquals("instance " + e.attribute("instance").getValue()
    83                      + " equals " + (count * 2), e.attribute("instance")
    84                      .getValue(), Integer.toString(count * 2));
    85              iter.next();
    86              count++;
    87          }
    88
    89          assertTrue((elementSize / 2) + " alternate elements iterated",
    90                  count == (elementSize / 2));
    91      }
    92
    93      public void testNoHasNext() throws Exception {
    94          Element root = iterDocument.getRootElement();
    95          List elements = root.elements("iterator test");
    96          Iterator iter = root.elementIterator("iterator test");
    97          int elementSize = elements.size();
    98          int count = 0;
    99          Element e = null;
    100
    101         for (; count < elementSize;) {
    102             e = (Element) iter.next();
    103             assertEquals("instance " + e.attribute("instance").getValue()
    104                     + " equals " + count, e.attribute("instance").getValue(),
    105                     Integer.toString(count));
    106             System.out.println("instance " + e.attribute("instance").getValue()
    107                     + " equals " + count);
    108             count++;
    109         }
    110
    111         try {
    112             e = (Element) iter.next();
    113
    114             if (e != null) {
    115                 // Real Iterators wouldn't get here
    116                 assertTrue("no more elements,value instead is "
    117                         + e.attribute("instance").getValue(), e == null);
    118             }
    119         } catch (Exception exp) {
    120             assertTrue("Real iterators throw NoSuchElementException",
    121                     exp instanceof java.util.NoSuchElementException);
    122         }
    123     }
    124
    125     public void testExtraHasNexts() throws Exception {
    126         Element root = iterDocument.getRootElement();
    127         List elements = root.elements("iterator test");
    128         Iterator iter = root.elementIterator("iterator test");
    129         int elementSize = elements.size();
    130         int count = 0;
    131
    132         for (; iter.hasNext();) {
    133             Element e = (Element) iter.next();
    134             assertEquals("instance " + e.attribute("instance").getValue()
    135                     + " equals " + count, e.attribute("instance").getValue(),
    136                     Integer.toString(count));
    137             iter.hasNext();
    138             count++;
    139         }
    140
    141         assertTrue(elementSize + " elements iterated with extra hasNexts",
    142                 count == elementSize);
    143     }
    144 }
    145
    146 /*
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    149  * following conditions are met:
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    153  *
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    159  * from this Software without prior written permission of MetaStuff, Ltd. For
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    163  * "DOM4J" appear in their names without prior written permission of MetaStuff,
    164  * Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
    165  *
    166  * 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
    167  *
    168  * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
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    180  * Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
    181  */