section.php

<?php
namespace Bitrix\Iblock\Template\Entity;
 
class Section extends Base
{
    protected $property = null;
    protected $iblock = null;
    protected $parent = null;
    protected $sections = null;
    protected $catalog = null;
 
    public function __construct($id)
    {
        parent::__construct($id);
        $this->fieldMap = array(
            "name" => "NAME",
            "previewtext" => "DESCRIPTION",
            "detailtext" => "DESCRIPTION",
            "code" => "CODE",
            //not accessible from template engine
            "ID" => "ID",
            "IBLOCK_ID" => "IBLOCK_ID",
            "IBLOCK_SECTION_ID" => "IBLOCK_SECTION_ID",
        );
    }
 
    public function resolve($entity)
    {
        if ($entity === "property")
        {
            if (!$this->property && $this->loadFromDatabase())
            {
                if ($this->fields["IBLOCK_ID"] > 0)
                {
                    $this->property = new SectionProperty($this->id);
                    $this->property->setIblockId($this->fields["IBLOCK_ID"]);
                }
            }
 
            if ($this->property)
                return $this->property;
        }
        elseif ($entity === "iblock")
        {
            if (!$this->iblock && $this->loadFromDatabase())
            {
                if ($this->fields["IBLOCK_ID"] > 0)
                    $this->iblock = new Iblock($this->fields["IBLOCK_ID"]);
            }
 
            if ($this->iblock)
                return $this->iblock;
        }
        elseif ($entity === "parent")
        {
            if (!$this->parent && $this->loadFromDatabase())
            {
                if ($this->fields["IBLOCK_SECTION_ID"] > 0)
                    $this->parent = new Section($this->fields["IBLOCK_SECTION_ID"]);
                else
                    return $this->resolve("iblock");
            }
 
            if ($this->parent)
                return $this->parent;
        }
        elseif ($entity === "sections")
        {
            if (!$this->sections && $this->loadFromDatabase())
            {
                if ($this->fields["IBLOCK_SECTION_ID"] > 0)
                    $this->sections = new SectionPath($this->fields["IBLOCK_SECTION_ID"]);
            }
 
            if ($this->sections)
                return $this->sections;
        }
        elseif ($entity === "catalog")
        {
            if (!$this->catalog && $this->loadFromDatabase())
            {
                if (\Bitrix\Main\Loader::includeModule('catalog'))
                    $this->catalog = new ElementCatalog(0);
            }
 
            if ($this->catalog)
                return $this->catalog;
        }
        return parent::resolve($entity);
    }
 
    public function setFields(array $fields)
    {
        parent::setFields($fields);
        if (
            is_array($this->fields)
            && $this->fields["IBLOCK_ID"] > 0
        )
        {
            $properties = array();
            foreach ($this->fields as $id => $value)
            {
                if (mb_substr($id, 0, 3) === "UF_")
                    $properties[$id] = $value;
            }
            $this->property = new SectionProperty($this->id);
            $this->property->setIblockId($this->fields["IBLOCK_ID"]);
            $this->property->setFields($properties);
 
            $this->iblock = new Iblock($fields["IBLOCK_ID"]);
 
            if (
                isset($fields["IBLOCK_SECTION_ID"])
                && $fields["IBLOCK_SECTION_ID"] > 0
            )
            {
                $this->parent = new Section($fields["IBLOCK_SECTION_ID"]);
                $this->sections = new SectionPath($fields["IBLOCK_SECTION_ID"]);
            }
 
            if (\Bitrix\Main\Loader::includeModule('catalog'))
                $this->catalog = new ElementCatalog($this->id);
        }
    }
 
    protected function loadFromDatabase()
    {
        if (!isset($this->fields))
        {
            $sectionList = \Bitrix\Iblock\SectionTable::getList(array(
                "select" => array_values($this->fieldMap),
                "filter" => array("=ID" => $this->id),
            ));
            $this->fields = $sectionList->fetch();
        }
        return is_array($this->fields);
    }
}