contributions/instancereference/lib/helpers/instancereferenceserializer.cls.php

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00001 <?php
00002 /**
00003  * Helper to turn an isntance into an array or string and vice versa
00004  */
00005 class InstanceReferenceSerializier {
00006         /**
00007          * Convert an instance to an array (containing type and keys)
00008          *
00009          * @param IDataObject $inst
00010          * @return array
00011          */
00012         public static function instance_to_array(IDataObject $inst) {
00013                 $ret = array($inst->get_table_name());
00014                 foreach($inst->get_table_keys() as $key => $field) {
00015                         /* @var $field DBField */
00016                         $ret[] = $inst->$key;
00017                 }
00018                 return $ret;            
00019         }
00020         
00021         /**
00022          * Convert an an array (containing type and keys) to an instance
00023          *
00024          * @return IDataObject
00025          * @param array $arr_inst
00026          */
00027         public static function array_to_instance($arr_inst) {
00028                 $ret = false;
00029                 $table = array_shift($arr_inst);
00030                 $dao = DB::create($table);
00031                 $params = array();
00032                 if ($dao) {
00033                         foreach($dao->get_table_keys() as $key => $field) {
00034                                 /* @var $field DBField */
00035                                 $params[$key] = array_shift($arr_inst);
00036                         }
00037                 }
00038                 return DB::get_item_multi($table, $params);
00039         }
00040 
00041         /**
00042          * Convert an instance to a string (containing type and keys, concated by '/')
00043          *
00044          * @param IDataObject $inst
00045          * @return string
00046          */
00047         public static function instance_to_string(IDataObject $inst) {
00048                 $ret = '';
00049                 $arr = self::instance_to_array($inst);
00050                 if (is_array($arr)) {
00051                         $ret = implode('/', $arr);
00052                 }
00053                 return $ret;            
00054         }
00055         
00056         /**
00057          * Convert a string (containing type and keys, concated by '/') to an instance 
00058          *
00059          * @param string $s
00060          * @return IDataObject $inst
00061          */
00062         public static function string_to_instance($s) {
00063                 $arr = explode('/', $s);
00064                 return self::array_to_instance($arr);
00065         }
00066 }