haanga/filters.php

   1 <?php
   2 /*
   3   +---------------------------------------------------------------------------------+
   4   | Copyright (c) 2010 Haanga                                                       |
   5   +---------------------------------------------------------------------------------+
   6   | Redistribution and use in source and binary forms, with or without              |
   7   | modification, are permitted provided that the following conditions are met:     |
   8   | 1. Redistributions of source code must retain the above copyright               |
   9   |    notice, this list of conditions and the following disclaimer.                |
  10   |                                                                                 |
  11   | 2. Redistributions in binary form must reproduce the above copyright            |
  12   |    notice, this list of conditions and the following disclaimer in the          |
  13   |    documentation and/or other materials provided with the distribution.         |
  14   |                                                                                 |
  15   | 3. All advertising materials mentioning features or use of this software        |
  16   |    must display the following acknowledgement:                                  |
  17   |    This product includes software developed by César D. Rodas.                  |
  18   |                                                                                 |
  19   | 4. Neither the name of the César D. Rodas nor the                               |
  20   |    names of its contributors may be used to endorse or promote products         |
  21   |    derived from this software without specific prior written permission.        |
  22   |                                                                                 |
  23   | THIS SOFTWARE IS PROVIDED BY CÉSAR D. RODAS ''AS IS'' AND ANY                   |
  24   | EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED       |
  25   | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE          |
  26   | DISCLAIMED. IN NO EVENT SHALL CÉSAR D. RODAS BE LIABLE FOR ANY                  |
  27   | DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES      |
  28   | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;    |
  29   | LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND     |
  30   | ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT      |
  31   | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS   |
  32   | SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE                     |
  33   +---------------------------------------------------------------------------------+
  34   | Authors: César Rodas <crodas@php.net>                                           |
  35   +---------------------------------------------------------------------------------+
  36 */
  37
  38 class Haanga_Filter extends Extensions
  39 {
  40     /**
  41      *  isValid
  42      *
  43      *
  44      */
  45     final function isValid($filter)
  46     {
  47         static $cache = array();
  48         $filter = strtolower($filter);
  49
  50         if (!isset($cache[$filter])) {
  51             $file = $this->getFilePath($filter);
  52             if (is_readable($file)) {
  53                 /* Load custom filter definition */
  54                 require_once $file;
  55                 $class_name = $this->getClassName($filter);
  56                 if (class_exists($class_name)) {
  57                     $cache[$filter] = TRUE;
  58                 }
  59             }
  60             if (!isset($cache[$filter])) {
  61                 $cache[$filter] = FALSE;
  62             }
  63         }
  64
  65         return $cache[$filter];
  66     }
  67
  68     final function getFilePath($file, $rel=TRUE)
  69     {
  70         return parent::getFilePath($file, $rel, 'filters');
  71     }
  72
  73     final function getClassName($filter)
  74     {
  75         return "{$filter}_filter";
  76     }
  77
  78
  79 }
  80
  81 /*
  82  * Local variables:
  83  * tab-width: 4
  84  * c-basic-offset: 4
  85  * End:
  86  * vim600: sw=4 ts=4 fdm=marker
  87  * vim<600: sw=4 ts=4
  88  */
  89