class.ilAdvancedMDFieldDefinition.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once "Services/ADT/classes/class.ilADTFactory.php";

abstract class ilAdvancedMDFieldDefinition
{
    protected $field_id; // [int]
    protected $record_id; // [int]
    protected $import_id; // [string]
    protected $position; // [int]
    protected $title; // [string]
    protected $description; // [string]
    protected $searchable; // [bool]
    protected $required; // [bool]
    protected $adt_def; // [ilADTDefinition]
    protected $adt; // [ilADT]

    protected $language = '';
    
    const TYPE_SELECT = 1;
    const TYPE_TEXT = 2;
    const TYPE_DATE = 3;
    const TYPE_DATETIME = 4;
    const TYPE_INTEGER = 5;
    const TYPE_FLOAT = 6;
    const TYPE_LOCATION = 7;
    const TYPE_SELECT_MULTI = 8;
    const TYPE_ADDRESS = 99;
    const TYPE_EXTERNAL_LINK = 9;
    const TYPE_INTERNAL_LINK = 10;

    protected $logger;

    public function __construct($a_field_id = null, string $language = '')
    {
        global $DIC;

        $this->language = $DIC->language()->getLangKey();
        $this->logger = $DIC->logger()->amet();
        if ($language) {
            $this->language = $language;
        }

        $this->init();
        $this->read($a_field_id);
    }
        
    public static function getInstance($a_field_id, $a_type = null, string $language = '')
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        if (!$a_type) {
            $set = $ilDB->query("SELECT field_type" .
                " FROM adv_mdf_definition" .
                " WHERE field_id = " . $ilDB->quote($a_field_id, "integer"));
            $a_type = $ilDB->fetchAssoc($set);
            $a_type = $a_type["field_type"];
        }
        
        if (self::isValidType($a_type)) {
            $class = "ilAdvancedMDFieldDefinition" . self::getTypeString($a_type);
            require_once "Services/AdvancedMetaData/classes/Types/class." . $class . ".php";
            return new $class($a_field_id, $language);
        }
        
        throw new ilException("unknown type " . $a_type);
    }
    
    public static function exists($a_field_id)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];

        $set = $ilDB->query("SELECT field_type" .
            " FROM adv_mdf_definition" .
            " WHERE field_id = " . $ilDB->quote($a_field_id, "integer"));
        if ($ilDB->fetchAssoc($set)) {
            return true;
        }
        return false;
    }

    public static function getInstanceByTypeString($a_type)
    {
        // see self::getTypeString()
        $map = array(
            self::TYPE_TEXT => "Text",
            self::TYPE_SELECT => "Select",
            self::TYPE_DATE => "Date",
            self::TYPE_DATETIME => "DateTime",
            self::TYPE_FLOAT => "Float",
            self::TYPE_LOCATION => "Location",
            self::TYPE_INTEGER => "Integer",
            self::TYPE_SELECT_MULTI => "SelectMulti"    ,
            self::TYPE_EXTERNAL_LINK => 'ExternalLink',
            self::TYPE_INTERNAL_LINK => 'InternalLink',
            self::TYPE_ADDRESS => "Address"
        );
        $map = array_flip($map);
        if (array_key_exists($a_type, $map)) {
            return self::getInstance(null, $map[$a_type]);
        }
    }
    
    public static function getInstancesByRecordId($a_record_id, $a_only_searchable = false, string $language = '')
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $defs = array();
        
        $query = "SELECT * FROM adv_mdf_definition" .
            " WHERE record_id = " . $ilDB->quote($a_record_id, "integer");
        if ($a_only_searchable) {
            $query .= " AND searchable = " . $ilDB->quote(1, "integer");
        }
        $query .= " ORDER BY position";
        $set = $ilDB->query($query);
        while ($row = $ilDB->fetchAssoc($set)) {
            $field = self::getInstance(null, $row["field_type"], $language);
            $field->import($row);
            $defs[$row["field_id"]] = $field;
        }
        
        return $defs;
    }
    
    public static function getInstancesByObjType($a_obj_type, $a_active_only = true)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $defs = array();
        
        $query = "SELECT amf.* FROM adv_md_record_objs aro" .
            " JOIN adv_md_record amr ON aro.record_id = amr.record_id" .
            " JOIN adv_mdf_definition amf ON aro.record_id = amf.record_id" .
            " WHERE obj_type = " . $ilDB->quote($a_obj_type, 'text');
        if ((bool) $a_active_only) {
            $query .= " AND active = " . $ilDB->quote(1, "integer");
        }
        $query .= " ORDER BY aro.record_id,position";
        $res = $ilDB->query($query);
        while ($row = $ilDB->fetchAssoc($res)) {
            $field = self::getInstance(null, $row["field_type"]);
            $field->import($row);
            $defs[$row["field_id"]] = $field;
        }
        return $defs;
    }
    
    public static function getInstanceByImportId($a_import_id)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $query = "SELECT field_id, field_type FROM adv_mdf_definition" .
            " WHERE import_id = " . $ilDB->quote($a_import_id, 'text');
        $set = $ilDB->query($query);
        if ($ilDB->numRows($set)) {
            $row = $ilDB->fetchAssoc($set);
            return self::getInstance($row["field_id"], $row["field_type"]);
        }
    }
    
    public static function getSearchableDefinitionIds()
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $field_ids = array();
        
        $query = "SELECT field_id FROM adv_md_record amr" .
            " JOIN adv_mdf_definition amfd ON (amr.record_id = amfd.record_id)" .
            " WHERE active = " . $ilDB->quote(1, "integer") .
            " AND searchable = " . $ilDB->quote(1, "integer");
        $set = $ilDB->query($query);
        while ($row = $ilDB->fetchAssoc($set)) {
            $field_ids[] = $row["field_id"];
        }
        return $field_ids;
    }
    
    public static function getADTGroupForDefinitions(array $a_defs)
    {
        $factory = ilADTFactory::getInstance();
        $group_def = $factory->getDefinitionInstanceByType("Group");
        foreach ($a_defs as $def) {
            $group_def->addElement($def->getFieldId(), $def->getADTDefinition());
        }
        $group = $factory->getInstanceByDefinition($group_def);
        
        // bind adt instances to definition
        foreach ($group->getElements() as $element_id => $element) {
            $a_defs[$element_id]->setADT($element);
        }
        
        return $group;
    }
    
    protected function init()
    {
        $this->setRequired(false);
        $this->setSearchable(false);
    }
    
    
    //
    // generic types
    //
    
    public static function getValidTypes()
    {
        return array(
            self::TYPE_TEXT,
            self::TYPE_DATE,
            self::TYPE_DATETIME,
            self::TYPE_SELECT,
            self::TYPE_INTEGER,
            self::TYPE_FLOAT,
            self::TYPE_LOCATION,
            self::TYPE_SELECT_MULTI,
            self::TYPE_EXTERNAL_LINK,
            self::TYPE_INTERNAL_LINK,
            self::TYPE_ADDRESS
        );
    }

    public static function isValidType($a_type)
    {
        return in_array((int) $a_type, self::getValidTypes());
    }
    
    abstract public function getType();
    
    protected static function getTypeString($a_type)
    {
        if (self::isValidType($a_type)) {
            $map = array(
                self::TYPE_TEXT => "Text",
                self::TYPE_SELECT => "Select",
                self::TYPE_DATE => "Date",
                self::TYPE_DATETIME => "DateTime",
                self::TYPE_FLOAT => "Float",
                self::TYPE_LOCATION => "Location",
                self::TYPE_INTEGER => "Integer",
                self::TYPE_SELECT_MULTI => "SelectMulti"        ,
                self::TYPE_EXTERNAL_LINK => 'ExternalLink',
                self::TYPE_INTERNAL_LINK => 'InternalLink',
                self::TYPE_ADDRESS => "Address"
            );
            return $map[$a_type];
        }
    }

    public function useDefaultLanguageMode(string $language)
    {
        if (!strlen($language)) {
            return true;
        }
        $record = ilAdvancedMDRecord::_getInstanceByRecordId($this->record_id);
        return strcmp($record->getDefaultLanguage(), $language) === 0;
    }
    
    public function getTypeTitle()
    {
        // :TODO: reuse udf stuff here ?!
        return "udf_type_" . strtolower(self::getTypeString($this->getType()));
    }
    
        
    
    //
    // ADT
    //
    
    abstract protected function initADTDefinition();
    
    public function getADTDefinition()
    {
        if (!$this->adt_def instanceof ilADTDefinition) {
            $this->adt_def = $this->initADTDefinition();
        }
        return $this->adt_def;
    }
    
    public function getADT()
    {
        if (!$this->adt instanceof ilADT) {
            $this->adt = ilADTFactory::getInstance()->getInstanceByDefinition($this->getADTDefinition());
        }
        return $this->adt;
    }
    
    protected function setADT(ilADT $a_adt)
    {
        if (!$this->adt instanceof ilADT) {
            $this->adt = $a_adt;
        }
    }
    
    //
    // properties
    //
    
    protected function setFieldId($a_id)
    {
        $this->field_id = (int) $a_id;
    }
    
    public function getFieldId()
    {
        return $this->field_id;
    }
    
    public function setRecordId($a_id)
    {
        $this->record_id = (int) $a_id;
    }
    
    public function getRecordId()
    {
        return $this->record_id;
    }
    
    public function setImportId($a_id_string)
    {
        if ($a_id_string !== null) {
            $a_id_string = trim($a_id_string);
        }
        $this->import_id = $a_id_string;
    }
    
    public function getImportId()
    {
        return $this->import_id;
    }
    
    public function setPosition($a_pos)
    {
        $this->position = (int) $a_pos;
    }
    
    public function getPosition()
    {
        return $this->position;
    }
    
    public function setTitle($a_title)
    {
        if ($a_title !== null) {
            $a_title = trim($a_title);
        }
        $this->title = $a_title;
    }
    
    public function getTitle()
    {
        return $this->title;
    }
    
    public function setDescription($a_desc)
    {
        if ($a_desc !== null) {
            $a_desc = trim($a_desc);
        }
        $this->description = $a_desc;
    }
    
    public function getDescription()
    {
        return $this->description;
    }
    
    public function isSearchSupported()
    {
        return true;
    }
    
    public function isFilterSupported()
    {
        return true;
    }
    
    public function setSearchable($a_status)
    {
        // see above
        if (!$this->isSearchSupported()) {
            $a_status = false;
        }
        $this->searchable = (bool) $a_status;
    }
    
    public function isSearchable()
    {
        return $this->searchable;
    }
    
    public function setRequired($a_status)
    {
        $this->required = (bool) $a_status;
    }
    
    public function isRequired()
    {
        return $this->required;
    }
    
    
    //
    // definition (NOT ADT-based)
    //
    
    protected function importFieldDefinition(array $a_def)
    {
    }
    
    protected function getFieldDefinition()
    {
        // type-specific properties
    }
    
    public function getFieldDefinitionForTableGUI(string $content_language)
    {
        // type-specific properties
    }
    
    protected function addCustomFieldToDefinitionForm(ilPropertyFormGUI $a_form, $a_disabled = false, string $language = '')
    {
        // type-specific
    }

    public function addToFieldDefinitionForm(ilPropertyFormGUI $a_form, ilAdvancedMDPermissionHelper $a_permissions, string $language = '')
    {
        global $DIC;

        $lng = $DIC['lng'];
        
        $perm = $a_permissions->hasPermissions(
            ilAdvancedMDPermissionHelper::CONTEXT_FIELD,
            $this->getFieldId(),
            array(
                array(ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY,
                    ilAdvancedMDPermissionHelper::SUBACTION_FIELD_TITLE)
                ,array(ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY,
                    ilAdvancedMDPermissionHelper::SUBACTION_FIELD_DESCRIPTION)
                ,array(ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY,
                    ilAdvancedMDPermissionHelper::SUBACTION_FIELD_SEARCHABLE)
                ,array(ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY,
                    ilAdvancedMDPermissionHelper::SUBACTION_FIELD_PROPERTIES)
        )
        );
                
        // title
        $translations = ilAdvancedMDFieldTranslations::getInstanceByRecordId($this->getRecordId());

        $title = new ilTextInputGUI($lng->txt('title'), 'title');
        $title->setValue($this->getTitle());
        $title->setSize(20);
        $title->setMaxLength(70);
        $title->setRequired(true);
        if ($this->getFieldId()) {
            $translations->modifyTranslationInfoForTitle($this->getFieldId(), $a_form, $title, $language);
        }
        else {
            $title->setValue($this->getTitle());
        }


        $a_form->addItem($title);
        
        if (!$perm[ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY][ilAdvancedMDPermissionHelper::SUBACTION_FIELD_TITLE]) {
            $title->setDisabled(true);
        }
        
        // desc
        $desc = new ilTextAreaInputGUI($lng->txt('description'), 'description');
        $desc->setValue($this->getDescription());
        $desc->setRows(3);
        $desc->setCols(50);
        if ($this->getFieldId()) {
            $translations->modifyTranslationInfoForDescription($this->getFieldId(), $a_form, $desc, $language);
        }
        else {
            $desc->setValue($this->getDescription());
        }

        $a_form->addItem($desc);

        
        if (!$perm[ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY][ilAdvancedMDPermissionHelper::SUBACTION_FIELD_DESCRIPTION]) {
            $desc->setDisabled(true);
        }
        
        // searchable
        $check = new ilCheckboxInputGUI($lng->txt('md_adv_searchable'), 'searchable');
        $check->setChecked($this->isSearchable());
        $check->setValue(1);
        $a_form->addItem($check);
        
        if (!$perm[ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY][ilAdvancedMDPermissionHelper::SUBACTION_FIELD_SEARCHABLE] ||
            !$this->isSearchSupported()) {
            $check->setDisabled(true);
        }
        
        /* required
        $check = new ilCheckboxInputGUI($lng->txt('md_adv_required'), 'required');
        $check->setChecked($this->isRequired());
        $check->setValue(1);
        $a_form->addItem($check);
        */
        
        $this->addCustomFieldToDefinitionForm(
            $a_form,
            !$perm[ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY][ilAdvancedMDPermissionHelper::SUBACTION_FIELD_PROPERTIES],
            $language
        );
    }

    public function importCustomDefinitionFormPostValues(ilPropertyFormGUI $a_form, string $language = '')
    {
        // type-specific
    }
    
    public function importDefinitionFormPostValues(ilPropertyFormGUI $a_form, ilAdvancedMDPermissionHelper $a_permissions, string $active_language)
    {
        $record = ilAdvancedMDRecord::_getInstanceByRecordId($this->record_id);
        $is_translation = (($active_language !== '') && ($active_language != $record->getDefaultLanguage()));
        if (!$a_form->getItemByPostVar("title")->getDisabled() && !$is_translation) {
            $this->setTitle($a_form->getInput("title"));
        }
        if (!$a_form->getItemByPostVar("description")->getDisabled() && !$is_translation) {
            $this->setDescription($a_form->getInput("description"));
        }
        if (!$a_form->getItemByPostVar("searchable")->getDisabled()) {
            $this->setSearchable($a_form->getInput("searchable"));
        }
        
        if ($a_permissions->hasPermission(
            ilAdvancedMDPermissionHelper::CONTEXT_FIELD,
            $this->getFieldId(),
            ilAdvancedMDPermissionHelper::ACTION_FIELD_EDIT_PROPERTY,
            ilAdvancedMDPermissionHelper::SUBACTION_FIELD_PROPERTIES
        )) {
            $this->importCustomDefinitionFormPostValues($a_form, $active_language);
        }
    }
    
    public function importDefinitionFormPostValuesNeedsConfirmation()
    {
        return false;
    }
    
    public function prepareCustomDefinitionFormConfirmation(ilPropertyFormGUI $a_form)
    {
        // type-specific
    }
    
    public function prepareDefinitionFormConfirmation(ilPropertyFormGUI $a_form)
    {
        $a_form->getItemByPostVar("title")->setDisabled(true);
        $a_form->getItemByPostVar("description")->setDisabled(true);
        $a_form->getItemByPostVar("searchable")->setDisabled(true);
        
        // checkboxes have no hidden on disabled
        if ($a_form->getInput("searchable")) {
            $hidden = new ilHiddenInputGUI("searchable");
            $hidden->setValue(1);
            $a_form->addItem($hidden);
        }
        
        $this->prepareCustomDefinitionFormConfirmation($a_form);
    }
    
    
    //
    // definition CRUD
    //
    
    protected function getLastPosition()
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $sql = "SELECT max(position) pos" .
            " FROM adv_mdf_definition" .
            " WHERE record_id = " . $ilDB->quote($this->getRecordId(), "integer");
        $set = $ilDB->query($sql);
        if ($ilDB->numRows($set)) {
            $pos = $ilDB->fetchAssoc($set);
            return (int) $pos["pos"];
        }
        
        return 0;
    }
    
    public function generateImportId($a_field_id)
    {
        return 'il_' . IL_INST_ID . '_adv_md_field_' . $a_field_id;
    }
    
    protected function getDBProperties()
    {
        $fields = array(
            "field_type" => array("integer", $this->getType()),
            "record_id" => array("integer", $this->getRecordId()),
            "import_id" => array("text", $this->getImportId()),
            "title" => array("text", $this->getTitle()),
            "description" => array("text", $this->getDescription()),
            "position" => array("integer", $this->getPosition()),
            "searchable" => array("integer", $this->isSearchable()),
            "required" => array("integer", $this->isRequired())
        );
        
        $def = $this->getFieldDefinition();
        if (is_array($def)) {
            $fields["field_values"] = array("text", serialize($def));
        }
        
        return $fields;
    }
    
    protected function import(array $a_data)
    {
        $this->setFieldId($a_data["field_id"]);
        
        $this->setRecordId($a_data["record_id"]);
        $this->setImportId($a_data["import_id"]);
        $this->setTitle($a_data["title"]);
        $this->setDescription($a_data["description"]);
        $this->setPosition($a_data["position"]);
        $this->setSearchable($a_data["searchable"]);
        $this->setRequired($a_data["required"]);
        $field_values = unserialize($a_data['field_values']);
        if ($a_data["field_values"] && is_array($field_values)) {
            $this->importFieldDefinition($field_values);
        }
    }
    
    protected function read($a_field_id)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        if (!(int) $a_field_id) {
            return;
        }
                
        $sql = "SELECT * FROM adv_mdf_definition" .
            " WHERE field_id = " . $ilDB->quote($a_field_id, "integer");
        $set = $ilDB->query($sql);
        if ($ilDB->numRows($set)) {
            $row = $ilDB->fetchAssoc($set);
            $this->import($row);
        }
    }

    public function save($a_keep_pos = false)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        if ($this->getFieldId()) {
            return $this->update();
        }
        
        $next_id = $ilDB->nextId("adv_mdf_definition");
        
        // append
        if (!$a_keep_pos) {
            $this->setPosition($this->getLastPosition() + 1);
        }
        
        // needs unique import id
        if (!$this->getImportId()) {
            $this->setImportId($this->generateImportId($next_id));
        }
        
        $fields = $this->getDBProperties();
        $fields["field_id"] = array("integer", $next_id);
        
        $ilDB->insert("adv_mdf_definition", $fields);
        
        $this->setFieldId($next_id);
    }
    
    public function update()
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        if (!$this->getFieldId()) {
            return $this->save();
        }
        
        $ilDB->update(
            "adv_mdf_definition",
            $this->getDBProperties(),
            array("field_id" => array("integer", $this->getFieldId()))
        );
    }
    
    public function delete()
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        if (!$this->getFieldId()) {
            return;
        }
    
        // delete all values
        include_once("Services/AdvancedMetaData/classes/class.ilAdvancedMDValues.php");
        ilAdvancedMDValues::_deleteByFieldId($this->getFieldId(), $this->getADT());
        
        $query = "DELETE FROM adv_mdf_definition" .
            " WHERE field_id = " . $ilDB->quote($this->getFieldId(), "integer");
        $ilDB->manipulate($query);
    }
    
    
    //
    // export/import
    //
    
    public function toXML(ilXmlWriter $a_writer)
    {
        $a_writer->xmlStartTag('Field', array(
            'id' => $this->generateImportId($this->getFieldId()),
            'searchable' => ($this->isSearchable() ? 'Yes' : 'No'),
            'fieldType' => self::getTypeString($this->getType())));
        
        $a_writer->xmlElement('FieldTitle', null, $this->getTitle());
        $a_writer->xmlElement('FieldDescription', null, $this->getDescription());

        $translations = ilAdvancedMDFieldTranslations::getInstanceByRecordId($this->getRecordId());
        $a_writer->xmlStartTag('FieldTranslations');
        foreach ($translations->getTranslations($this->getFieldId()) as $translation) {
            $a_writer->xmlStartTag('FieldTranslation', ['language' => $translation->getLangKey()]);
            $a_writer->xmlElement('FieldTranslationTitle', [], (string) $translation->getTitle());
            $a_writer->xmlElement('FieldTranslationDescription',[], (string) $translation->getDescription());
            $a_writer->xmlEndTag('FieldTranslation');
        }
        $a_writer->xmlEndTag('FieldTranslations');
        $a_writer->xmlElement('FieldPosition', null, $this->getPosition());
        
        $this->addPropertiesToXML($a_writer);
        
        $a_writer->xmlEndTag('Field');
    }
    
    protected function addPropertiesToXML(ilXmlWriter $a_writer)
    {
        // type-specific properties
    }

    public function importXMLProperty($a_key, $a_value)
    {
    }
        
    abstract public function getValueForXML(ilADT $element);
    
    abstract public function importValueFromXML($a_cdata);
        
    public function importFromECS($a_ecs_type, $a_value, $a_sub_id)
    {
        return false;
    }
    
    
    //
    // presentation
    //
    
    public function prepareElementForEditor(ilADTFormBridge $a_bridge)
    {
        // type-specific
    }
    
    
    //
    // search
    //
    
    public function getSearchQueryParserValue(ilADTSearchBridge $a_adt_search)
    {
        return '';
    }
    
    public function getSearchValueSerialized(ilADTSearchBridge $a_adt_search)
    {
        return $a_adt_search->getSerializedValue();
    }
    
    public function setSearchValueSerialized(ilADTSearchBridge $a_adt_search, $a_value)
    {
        return $a_adt_search->setSerializedValue($a_value);
    }
    
    protected function parseSearchObjects(array $a_records, array $a_object_types)
    {
        global $DIC;

        $ilDB = $DIC['ilDB'];
        
        $res = array();
        
        $obj_ids = array();
        foreach ($a_records as $record) {
            if ($record["sub_type"] == "-") {
                $obj_ids[] = $record["obj_id"];
            }
        }
        
        $sql = "SELECT obj_id,type" .
            " FROM object_data" .
            " WHERE " . $ilDB->in("obj_id", $obj_ids, "", "integer") .
            " AND " . $ilDB->in("type", $a_object_types, "", "text");
        $set = $ilDB->query($sql);
        while ($row = $ilDB->fetchAssoc($set)) {
            $res[] = $row;
        }
        
        return $res;
    }
    
    public function searchSubObjects(ilADTSearchBridge $a_adt_search, $a_obj_id, $sub_obj_type)
    {
        include_once('Services/ADT/classes/ActiveRecord/class.ilADTActiveRecordByType.php');
        $element_id = ilADTActiveRecordByType::SINGLE_COLUMN_NAME;
        
        // :TODO:
        if ($a_adt_search instanceof ilADTLocationSearchBridgeSingle) {
            $element_id = "loc";
        }
                                    
        $condition = $a_adt_search->getSQLCondition($element_id);
        if ($condition) {
            $objects = ilADTActiveRecordByType::find("adv_md_values", $this->getADT()->getType(), $this->getFieldId(), $condition);
            if (sizeof($objects)) {
                $res = array();
                foreach ($objects as $item) {
                    if ($item["obj_id"] == $a_obj_id &&
                        $item["sub_type"] == $sub_obj_type) {
                        $res[] = $item["sub_id"];
                    }
                }
                return $res;
            }
        }
        
        return array();
    }
        
    public function searchObjects(ilADTSearchBridge $a_adt_search, ilQueryParser $a_parser, array $a_object_types, $a_locate, $a_search_type)
    {
        // search type only supported/needed for text
        include_once('Services/ADT/classes/ActiveRecord/class.ilADTActiveRecordByType.php');
        $condition = $a_adt_search->getSQLCondition(ilADTActiveRecordByType::SINGLE_COLUMN_NAME);
        if ($condition) {
            $objects = ilADTActiveRecordByType::find("adv_md_values", $this->getADT()->getType(), $this->getFieldId(), $condition, $a_locate);
            if (sizeof($objects)) {
                return $this->parseSearchObjects($objects, $a_object_types);
            }
            return array();
        }
    }
    
    public function getLuceneSearchString($a_value)
    {
        return $a_value;
    }
    
    public function prepareElementForSearch(ilADTSearchBridge $a_bridge)
    {
        // type-specific
    }
    
    public function _clone($a_new_record_id)
    {
        $class = get_class($this);
        $obj = new $class();
        $obj->setRecordId($a_new_record_id);
        $obj->setTitle($this->getTitle());
        $obj->setDescription($this->getDescription());
        $obj->setRequired($this->isRequired());
        $obj->setPosition($this->getPosition());
        $obj->setSearchable($this->isSearchable());
        $obj->importFieldDefinition((array) $this->getFieldDefinition());
        $obj->save(true);

        return $obj;
    }
    //
    // complex options
    //
    
    public function hasComplexOptions()
    {
        return false;
    }

    public function getComplexOptionsOverview($a_parent_gui, string $parent_cmd) : ?string
    {
        return null;
    }
}