1<?php 2 3/** @file dbareader.inc 4 * @ingroup Examples 5 * @brief class DbaReader 6 * @author Marcus Boerger 7 * @date 2003 - 2005 8 * 9 * SPL - Standard PHP Library 10 */ 11 12/** @ingroup Examples 13 * @brief This implements a DBA Iterator. 14 * @author Marcus Boerger 15 * @version 1.0 16 */ 17class DbaReader implements Iterator 18{ 19 20 protected $db = NULL; 21 private $key = false; 22 private $val = false; 23 24 /** 25 * Open database $file with $handler in read only mode. 26 * 27 * @param file Database file to open. 28 * @param handler Handler to use for database access. 29 */ 30 function __construct($file, $handler) { 31 if (!$this->db = dba_open($file, 'r', $handler)) { 32 throw new exception('Could not open file ' . $file); 33 } 34 } 35 36 /** 37 * Close database. 38 */ 39 function __destruct() { 40 dba_close($this->db); 41 } 42 43 /** 44 * Rewind to first element. 45 */ 46 function rewind() { 47 $this->key = dba_firstkey($this->db); 48 $this->fetch_data(); 49 } 50 51 /** 52 * Move to next element. 53 * 54 * @return void 55 */ 56 function next() { 57 $this->key = dba_nextkey($this->db); 58 $this->fetch_data(); 59 } 60 61 /** 62 * Fetches the current data if $key is valid 63 */ 64 private function fetch_data() { 65 if ($this->key !== false) { 66 $this->val = dba_fetch($this->key, $this->db); 67 } 68 } 69 70 /** 71 * @return Current data. 72 */ 73 function current() { 74 return $this->val; 75 } 76 77 /** 78 * @return Whether more elements are available. 79 */ 80 function valid() { 81 if ($this->db && $this->key !== false) { 82 return true; 83 } else { 84 return false; 85 } 86 } 87 88 /** 89 * @return Current key. 90 */ 91 function key() { 92 return $this->key; 93 } 94} 95 96?> 97
