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<?php
/**
* Bitrix Framework
* @package bitrix
* @subpackage iblock
*/
namespace Bitrix\Iblock\Template\Entity;
/**
* Class Base
*
* @package Bitrix\Iblock\Template\Entity
*/
class Base
{
/** @var integer */
protected $id = null;
/** @var array[string]mixed */
protected $fields = null;
/** @var array[string]string */
protected $fieldMap = array();
/**
* @param integer $id Entity identifier.
*/
public function __construct($id)
{
$this->id = $id;
}
/**
* Returns entity identifier.
*
* @return integer
*/
public function getId()
{
return $this->id;
}
/**
* Used to find entity for template processing.
*
* @param string $entity What to find.
*
* @return \Bitrix\Iblock\Template\Entity\Base
*/
public function resolve($entity)
{
if ($entity === "this")
return $this;
else
return new Base(0);
}
/**
* Used to initialize entity fields from some external source.
*
* @param array $fields Entity fields.
*
* @return void
*/
public function setFields(array $fields)
{
$this->fields = $fields;
}
/**
* Returns field value.
*
* @param string $fieldName Name of the field to retrieve data from.
*
* @return string
*/
public function getField($fieldName)
{
if (!$this->loadFromDatabase())
return "";
if (!isset($this->fieldMap[$fieldName]))
return "";
$fieldName = $this->fieldMap[$fieldName];
if (!isset($this->fields[$fieldName]))
return "";
$fieldValue = $this->fields[$fieldName];
if (is_array($fieldValue))
{
$result = array();
foreach($fieldValue as $key => $value)
{
if ($value instanceof LazyValueLoader)
$result[$key] = $value->getValue();
else
$result[$key] = $value;
}
return $result;
}
else
{
if ($fieldValue instanceof LazyValueLoader)
{
return $fieldValue->getValue();
}
return $this->fields[$fieldName];
}
}
/**
* Loads values from database.
* Returns true on success.
*
* @return boolean
*/
protected function loadFromDatabase()
{
if (!isset($this->fields))
{
$this->fields = array();
}
return true;
}
/**
* Sets new field value only when is not set yet.
* Adds mapping from field name to it's internal presentation.
*
* @param string $fieldName The name of the field.
* @param string $internalName Internal name of the field.
* @param string $value Value to be stored.
*
* @return void
*/
protected function addField($fieldName, $internalName, $value)
{
if (!isset($this->fields[$internalName]))
$this->fields[$internalName] = $value;
$this->fieldMap[mb_strtolower($fieldName)] = $internalName;
}
}
/**
* Class LazyValueLoader
* Strategy class used for delaying queries to DB.
*
* @package Bitrix\Iblock\Template\Entity
*/
class LazyValueLoader
{
protected $value = null;
protected $key = null;
/**
* @param string|integer $key Unique identifier.
*/
function __construct($key)
{
$this->key = $key;
}
/**
* Calls load method if value was not loaded yet.
*
* @return mixed
*/
public function __toString()
{
if (!isset($this->value))
$this->value = $this->load();
return $this->value;
}
/**
* Calls load method if value was not loaded yet.
*
* @return mixed
*/
public function getValue()
{
if (!isset($this->value))
$this->value = $this->load();
return $this->value;
}
/**
* Actual work method which have to retrieve data from the DB.
*
* @return mixed
*/
protected function load()
{
return "";
}
}