1<?php
2
3/** @file recursivecomparedualiterator.inc
4 * @ingroup Examples
5 * @brief class DualIterator
6 * @author  Marcus Boerger
7 * @date    2003 - 2006
8 *
9 * SPL - Standard PHP Library
10 */
11
12/** @ingroup Examples
13 * @brief   Recursive comparison iterator for a RecursiveDualIterator
14 * @author  Marcus Boerger
15 * @version 1.0
16 */
17class RecursiveCompareDualIterator extends RecursiveIteratorIterator
18{
19    /** Used to keep end of recursion equality. That is en leaving a nesting
20     * level we need to check whether both child iterators are at their end.
21     */
22    protected $equal = false;
23
24    /** Construct from RecursiveDualIterator
25     *
26     * @param $it      RecursiveDualIterator
27     * @param $mode    should be LEAVES_ONLY
28     * @param $flags   should be 0
29     */
30    function __construct(RecursiveDualIterator $it, $mode = self::LEAVES_ONLY, $flags = 0)
31    {
32        parent::__construct($it);
33    }
34
35    /** Rewind iteration and comparison process. Starting with $equal = true.
36     */
37    function rewind()
38    {
39        $this->equal = true;
40        parent::rewind();
41    }
42
43    /** Calculate $equal
44     * @see $equal
45     */
46    function endChildren()
47    {
48        $this->equal &= !$this->getInnerIterator()->getLHS()->valid()
49                     && !$this->getInnerIterator()->getRHS()->valid();
50    }
51
52    /** @return whether both inner iterators are valid and have identical
53     * current and key values or both are non valid.
54     */
55    function areIdentical()
56    {
57        return $this->equal && $this->getInnerIterator()->areIdentical();
58    }
59
60    /** @return whether both inner iterators are valid and have equal current
61     * and key values or both are non valid.
62     */
63    function areEqual()
64    {
65        return $this->equal && $this->getInnerIterator()->areEqual();
66    }
67}
68
69?>
70