CiteData.php

   1 <?php
   2 define("field_not_exist","field doesn`t exist");
   3   define("error_message","Error occured: ");
   4   define("bad_data","multiple fields, should be just one");
   5 class CiteData{
   6     private static $instance;
   7     private $data=array();
   8     private $fieldslist=array();
   9     public $current=array();
  10     private function __construct()
  11     {}
  12
  13     public static function getInstance()
  14     {
  15         if (self::$instance === NULL) {
  16             self::$instance = new self;
  17         }
  18         return self::$instance;
  19     }
  20     protected function uniqueKey($key,$suffix){
  21       $instance=self::getInstance();
  22       if(array_key_exists($key,$instance->data))return $instance->uniqueKey($key.$suffix,++$suffix);
  23       return $key;
  24     }
  25     protected function getKey($data){
  26       if(count($data)<1)throw new Exception("Empty record");
  27       $key=array_key_exists("key",$data)?$data["key"]:strtolower($data["author"][0]["last"].$data["date"]);
  28       return self::uniqueKey($key,"a");
  29     }
  30     public function loadData($data){
  31       $instance=self::getInstance();
  32       for($i=0;$i<count($data);$i++){
  33         try{
  34           $key= $instance->getKey($data[$i]);
  35           $instance->data[$key]=$data[$i];
  36         }catch(Exception $e){}
  37       }
  38       reset($instance->data);
  39       $instance->setCurrent();
  40       //print_r($instance->data);
  41       return $this;
  42     }
  43     public function getCiteKey(){
  44       $instance=self::getInstance();
  45       return $instance->current["key"];
  46     }
  47     public function setCurrent(){
  48       $instance=self::getInstance();
  49       $data=current($instance->data);
  50       $key=key($instance->data);
  51       if($data){
  52         $instance->current=array("key"=>$key,
  53         "data"=>$data);
  54       }else{
  55         $instance->current=false;
  56       }
  57     }
  58     public function getData($field){
  59       $instance=self::getInstance();
  60       if(array_key_exists($field,$instance->current["data"])){
  61         /*$list=array();
  62         foreach($instance->fieldslist[$field] as $record){
  63           $list[]=$instance->data[$record];
  64         }
  65         return $list;*/
  66         return $instance->current["data"][$field];
  67       }else{
  68         //throw new Exception(field_not_exist);
  69         return null;
  70       }
  71     }
  72     public function records($records){
  73       $instance=self::getInstance();
  74       $instance->keys=is_array($records)?$records:$instance->key;
  75     }
  76     public function current(){
  77       $instance=self::getInstance();
  78       return is_array($instance->current)===false?false:true;
  79     }
  80     public function next(){
  81       $instance=self::getInstance();
  82       each($instance->data);
  83       $instance->setCurrent();
  84       return is_array($instance->current)===false?false:true;
  85     }
  86     public function getField($field){
  87       try{
  88         $instance=self::getInstance();
  89         $list=$instance->getData($field);
  90         if(count($list)==1){
  91           return($list);
  92         }else{
  93           throw new Exception(bad_data);
  94         }
  95       }catch(Exception $e){
  96         $instance->printError($e);
  97       }
  98     }
  99     public function getList($field){
 100         $instance=self::getInstance();
 101         return $instance->getData($field);
 102     }
 103     public function printError(Exception $e){
 104       echo "<div style=\"border:1px solid black;color:red;\">".error_message.$e->getMessage()."</div>\n";
 105     }
 106
 107 }
 108
 109
 110 ?>