AdditionalColumnService.php

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<?php
namespace TYPO3\CMS\Workspaces\Service;

class AdditionalColumnService implements \TYPO3\CMS\Core\SingletonInterface {

    protected $columns = array();

    static public function getInstance() {
        return self::getObjectManager()->get('TYPO3\\CMS\\Workspaces\\Service\\AdditionalColumnService');
    }

    static public function getObjectManager() {
        return \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Extbase\\Object\\ObjectManager');
    }

    public function register($columnName, $dataProviderClassOrObject) {
        if (is_object($dataProviderClassOrObject)) {
            $dataProvider = $dataProviderClassOrObject;
        } else {
            $dataProvider = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($dataProviderClassOrObject);
        }

        if (!$dataProvider instanceof \TYPO3\CMS\Workspaces\ColumnDataProviderInterface) {
            throw new \RuntimeException('Data provider needs to implement ColumnDataProviderInterface', 1374309323);
        }

        $this->columns[$columnName] = $dataProvider;
    }

    public function getDefinition() {
        $columnSettings = array();
        foreach ($this->columns as $columnName => $dataProvider) {
            $definition = $dataProvider->getDefinition();

            if (!is_array($definition)) {
                $definition = array();
            }

            $definition['name'] = $columnName;
            $columnSettings[] = $definition;
        }
        return $columnSettings;
    }

    public function getHandler() {
        $columnSettings = array();
        foreach ($this->columns as $columnName => $_) {
            $columnSettings[] = 'TYPO3.Workspaces.extension.AdditionalColumn.' . $columnName;
        }
        return $columnSettings;
    }

    public function getData(\TYPO3\CMS\Workspaces\Domain\Model\CombinedRecord $combinedRecord) {
        $recordData = array();
        foreach ($this->columns as $columnName => $dataProvider) {
            $data = $dataProvider->getData($combinedRecord);

            if ($data !== NULL) {
                $recordData[$columnName] = $data;
            }
        }
        return $recordData;
    }
}