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1<?php
2
3/**
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; under version 2
7 * of the License (non-upgradable).
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
17 *
18 * Copyright (c) 2014 (original work) Open Assessment Technologies SA;
19 *
20 *
21 */
22
23/**
24 * Iterates over a class(es) and its subclasses
25 *
26 * @author Joel Bout <joel@taotesting.com>
27 */
28class core_kernel_classes_ClassIterator implements \Iterator
29{
30    /**
31     * List of classes whose subclasses have not yet been exploded
32     *
33     * @var array
34     */
35    private $todoClasses = [];
36
37    private $classes = [];
38
39    private $currentId = -1;
40
41    /**
42     * Constructor of the iterator expecting a class or classes as argument
43     *
44     * @param mixed $classes array/instance of class(es) to iterate over
45     */
46    public function __construct($classes)
47    {
48        $classes = is_array($classes) ? $classes : [$classes];
49        foreach ($classes as $class) {
50            $this->todoClasses[] = (is_object($class) && $class instanceof core_kernel_classes_Class)
51                ? $class->getUri()
52                : $class;
53        }
54        $this->rewind();
55    }
56
57    /**
58     * (non-PHPdoc)
59     * @see Iterator::rewind()
60     */
61    public function rewind()
62    {
63        $this->currentId = -1;
64        $this->next();
65    }
66
67    /**
68     * (non-PHPdoc)
69     * @see Iterator::current()
70     */
71    public function current()
72    {
73        return new \core_kernel_classes_Class($this->classes[$this->currentId]);
74    }
75
76    /**
77     * (non-PHPdoc)
78     * @see Iterator::key()
79     */
80    public function key()
81    {
82        return $this->currentId;
83    }
84
85    /**
86     * (non-PHPdoc)
87     * @see Iterator::next()
88     */
89    public function next()
90    {
91        $this->currentId++;
92        if (!isset($this->classes[$this->currentId]) && !empty($this->todoClasses)) {
93            $newUri = array_shift($this->todoClasses);
94            $this->classes[] = $newUri;
95            $class = new \core_kernel_classes_Class($newUri);
96            foreach ($class->getSubClasses(false) as $subClass) {
97                if (
98                    !in_array($subClass->getUri(), $this->classes)
99                    && !in_array($subClass->getUri(), $this->todoClasses)
100                ) {
101                    $this->todoClasses[] = $subClass->getUri();
102                }
103            }
104        }
105    }
106
107    /**
108     * (non-PHPdoc)
109     * @see Iterator::valid()
110     */
111    public function valid()
112    {
113        return isset($this->classes[$this->currentId]);
114    }
115}