1: | <?php |
2: | |
3: | namespace Zippy; |
4: | |
5: | use Zippy\Html\WebPage; |
6: | |
7: | |
8: | |
9: | |
10: | |
11: | |
12: | class PageManager |
13: | { |
14: | public const HISTORY_SIZE = 50; |
15: | |
16: | private $pages = array(); |
17: | private $index = 0; |
18: | private $pchain = array(); |
19: | private $curpage = ''; |
20: | private $prevpage = ''; |
21: | |
22: | |
23: | |
24: | |
25: | |
26: | |
27: | |
28: | final public function putPage(WebPage $page) { |
29: | $page->beforeSaveToSession(); |
30: | |
31: | |
32: | $this->pages[++$this->index] = ($page); |
33: | if ($this->index > self::HISTORY_SIZE) { |
34: | $this->pages[$this->index - self::HISTORY_SIZE] = null; |
35: | } |
36: | |
37: | $prevpage = $this->unpack($this->pages[$this->index - 1]); |
38: | if ($prevpage instanceof \Zippy\Html\WebPage) { |
39: | |
40: | if (get_class($prevpage) != get_class($page)) { |
41: | |
42: | |
43: | $this->pchain[] = get_class($page); |
44: | } |
45: | } |
46: | |
47: | return $this->index; |
48: | } |
49: | |
50: | |
51: | |
52: | |
53: | |
54: | |
55: | final public function updatePage(WebPage $page) { |
56: | |
57: | $page->beforeSaveToSession(); |
58: | $pname = get_class($page) ; |
59: | if($this->curpage != $pname) { |
60: | $this->prevpage = $this->curpage; |
61: | $this->pchain[] = $pname; |
62: | } |
63: | $this->curpage = $pname ; |
64: | $this->pages[$pname] = $page; |
65: | return $pname; |
66: | } |
67: | |
68: | |
69: | |
70: | |
71: | |
72: | |
73: | final public function getPage($number) { |
74: | if (isset($this->pages[$number])) { |
75: | |
76: | if ($this->pages[$number] instanceof WebPage) { |
77: | $page = ($this->pages[$number]); |
78: | } else { |
79: | $page = $this->unpack($this->pages[$number]); |
80: | } |
81: | |
82: | |
83: | if ($page instanceof WebPage) { |
84: | $page->afterRestoreFromSession(); |
85: | } else { |
86: | $page = null; |
87: | } |
88: | return $page; |
89: | } |
90: | |
91: | return null; |
92: | } |
93: | |
94: | |
95: | |
96: | |
97: | |
98: | final public function getLastPage() { |
99: | return array_pop($this->pchain); |
100: | } |
101: | |
102: | |
103: | |
104: | public function __sleep() { |
105: | |
106: | $pl = array(); |
107: | foreach ($this->pages as $n => $p) { |
108: | if ($p instanceof WebPage) { |
109: | $pl[] = $n; |
110: | } |
111: | } |
112: | foreach ($pl as $n) { |
113: | $this->pages[$n] = $this->pack($this->pages[$n]); |
114: | } |
115: | return array('pages', 'index', 'pchain','curpage','prevpage'); |
116: | } |
117: | |
118: | public function __wakeup() { |
119: | if (is_array($this->pages)) { |
120: | return; |
121: | } |
122: | |
123: | } |
124: | |
125: | |
126: | |
127: | |
128: | |
129: | public function getPrevPage() { |
130: | array_pop($this->pchain); |
131: | return array_pop($this->pchain); |
132: | } |
133: | |
134: | |
135: | private function pack($page) { |
136: | return gzcompress(serialize($page)); |
137: | } |
138: | |
139: | private function unpack($page) { |
140: | $p = @gzuncompress($page); |
141: | if (strlen($p) == 0) { |
142: | return null; |
143: | } |
144: | return unserialize($p); |
145: | } |
146: | |
147: | } |
148: | |