| 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: | |