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   1  <?php
   2  /**
   3   * Zend Framework
   4   *
   5   * LICENSE
   6   *
   7   * This source file is subject to version 1.0 of the Zend Framework
   8   * license, that is bundled with this package in the file LICENSE, and
   9   * is available through the world-wide-web at the following URL:
  10   * http://www.zend.com/license/framework/1_0.txt. If you did not receive
  11   * a copy of the Zend Framework license and are unable to obtain it
  12   * through the world-wide-web, please send a note to license@zend.com
  13   * so we can mail you a copy immediately.
  14   *
  15   * @package    Zend_Search_Lucene
  16   * @subpackage Analysis
  17   * @copyright  Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
  18   * @license    http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
  19   */
  20  
  21  
  22  /** Zend_Search_Lucene_Analysis_Token */
  23  require_once 'Zend/Search/Lucene/Analysis/Token.php';
  24  
  25  /** Zend_Search_Lucene_Analysis_Analyzer_Common_Text */
  26  require_once 'Zend/Search/Lucene/Analysis/Analyzer/Common/Text.php';
  27  
  28  /** Zend_Search_Lucene_Analysis_Analyzer_Common_Text_CaseInsensitive */
  29  require_once 'Zend/Search/Lucene/Analysis/Analyzer/Common/Text/CaseInsensitive.php';
  30  
  31  
  32  
  33  /**
  34   * An Analyzer is used to analyze text.
  35   * It thus represents a policy for extracting index terms from text.
  36   *
  37   * Note:
  38   * Lucene Java implementation is oriented to streams. It provides effective work
  39   * with a huge documents (more then 20Mb).
  40   * But engine itself is not oriented such documents.
  41   * Thus Zend_Search_Lucene analysis API works with data strings and sets (arrays).
  42   *
  43   * @package    Zend_Search_Lucene
  44   * @subpackage Analysis
  45   * @copyright  Copyright (c) 2005-2006 Zend Technologies USA Inc. (http://www.zend.com)
  46   * @license    http://www.zend.com/license/framework/1_0.txt Zend Framework License version 1.0
  47   */
  48  
  49  abstract class Zend_Search_Lucene_Analysis_Analyzer
  50  {
  51      /**
  52       * The Analyzer implementation used by default.
  53       *
  54       * @var Zend_Search_Lucene_Analysis_Analyzer
  55       */
  56      static private $_defaultImpl;
  57  
  58      /**
  59       * Tokenize text to a terms
  60       * Returns array of Zend_Search_Lucene_Analysis_Token objects
  61       *
  62       * @param string $data
  63       * @return array
  64       */
  65      abstract public function tokenize($data);
  66  
  67  
  68      /**
  69       * Set the default Analyzer implementation used by indexing code.
  70       *
  71       * @param Zend_Search_Lucene_Analysis_Analyzer $similarity
  72       */
  73      static public function setDefault(Zend_Search_Lucene_Analysis_Analyzer $analyzer)
  74      {
  75          self::$_defaultImpl = $analyzer;
  76      }
  77  
  78  
  79      /**
  80       * Return the default Analyzer implementation used by indexing code.
  81       *
  82       * @return Zend_Search_Lucene_Analysis_Analyzer
  83       */
  84      static public function getDefault()
  85      {
  86          if (!self::$_defaultImpl instanceof Zend_Search_Lucene_Analysis_Analyzer) {
  87              self::$_defaultImpl = new Zend_Search_Lucene_Analysis_Analyzer_Common_Text_CaseInsensitive();
  88          }
  89  
  90          return self::$_defaultImpl;
  91      }
  92  
  93  }
  94