silverstripe-framework/model/FieldType/DBEnum.php

<?php

namespace SilverStripe\Model\FieldType;

use DB;
use ArrayLib;
use DropdownField;
use Config;

/**
 * Class Enum represents an enumeration of a set of strings.
 *
 * See {@link DropdownField} for a {@link FormField} to select enum values.
 *
 * @package framework
 * @subpackage model
 */
class DBEnum extends DBString {

	/**
	 * List of enum values
	 *
	 * @var array
	 */
	protected $enum = array();

	/**
	 * Default value
	 *
	 * @var string|null
	 */
	protected $default = null;

	private static $default_search_filter_class = 'ExactMatchFilter';

	/**
	 * Create a new Enum field.
	 *
	 * Example usage in {@link DataObject::$db} with comma-separated string
	 * notation ('Val1' is default)
	 *
	 * <code>
	 *  "MyField" => "Enum('Val1, Val2, Val3', 'Val1')"
	 * </code>
	 *
	 * Example usage in in {@link DataObject::$db} with array notation
	 * ('Val1' is default)
	 *
	 * <code>
	 * "MyField" => "Enum(array('Val1', 'Val2', 'Val3'), 'Val1')"
	 * </code>
	 *
	 * @param enum: A string containing a comma separated list of options or an
	 *				array of Vals.
	 * @param string The default option, which is either NULL or one of the
	 *				 items in the enumeration.
	 */
	public function __construct($name = null, $enum = NULL, $default = NULL) {
		if($enum) {
			$this->setEnum($enum);

			// If there's a default, then
			if($default) {
				if(in_array($default, $this->getEnum())) {
					$this->setDefault($default);
				} else {
					user_error("Enum::__construct() The default value '$default' does not match any item in the"
						. " enumeration", E_USER_ERROR);
				}

			// By default, set the default value to the first item
			} else {
				$enum = $this->getEnum();
				$this->setDefault(reset($enum));
			}
		}

		parent::__construct($name);
	}

	/**
	 * @return void
	 */
	public function requireField() {
		$charset = Config::inst()->get('MySQLDatabase', 'charset');
		$collation = Config::inst()->get('MySQLDatabase', 'collation');

		$parts = array(
			'datatype' => 'enum',
			'enums' => $this->getEnum(),
			'character set' => $charset,
			'collate' => $collation,
			'default' => $this->getDefault(),
			'table' => $this->getTable(),
			'arrayValue' => $this->arrayValue
		);

		$values = array(
			'type' => 'enum',
			'parts' => $parts
		);

		DB::require_field($this->getTable(), $this->getName(), $values);
	}

	/**
	 * Return a dropdown field suitable for editing this field.
	 *
	 * @return DropdownField
	 */
	public function formField($title = null, $name = null, $hasEmpty = false, $value = "", $form = null,
			$emptyString = null) {

		if(!$title) {
			$title = $this->getName();
		}
		if(!$name) {
			$name = $this->getName();
		}

		$field = new DropdownField($name, $title, $this->enumValues(false), $value, $form);
		if($hasEmpty) {
			$field->setEmptyString($emptyString);
		}

		return $field;
	}

	/**
	 * @return DropdownField
	 */
	public function scaffoldFormField($title = null, $params = null) {
		return $this->formField($title);
	}

	/**
	 * @param string
	 *
	 * @return DropdownField
	 */
	public function scaffoldSearchField($title = null) {
		$anyText = _t('Enum.ANY', 'Any');
		return $this->formField($title, null, true, $anyText, null, "($anyText)");
	}

	/**
	 * Returns the values of this enum as an array, suitable for insertion into
	 * a {@link DropdownField}
	 *
	 * @param boolean
	 *
	 * @return array
	 */
	public function enumValues($hasEmpty = false) {
		return ($hasEmpty)
			? array_merge(array('' => ''), ArrayLib::valuekey($this->getEnum()))
			: ArrayLib::valuekey($this->getEnum());
	}

	/**
	 * Get list of enum values
	 *
	 * @return array
	 */
	public function getEnum() {
		return $this->enum;
	}

	/**
	 * Set enum options
	 *
	 * @param string|array $enum
	 * @return $this
	 */
	public function setEnum($enum) {
		if(!is_array($enum)) {
			$enum = preg_split(
				'/\s*,\s*/',
				// trim commas only if they are on the right with a newline following it
				ltrim(preg_replace('/,\s*\n\s*$/','',$enum))
			);
		}
		$this->enum = $enum;
		return $this;
	}

	/**
	 * Get default vwalue
	 *
	 * @return string|null
	 */
	public function getDefault() {
		return $this->default;
	}

	/**
	 * Set default value
	 *
	 * @param string $default
	 * @return $this
	 */
	public function setDefault($default) {
		$this->default = $default;
		return $this;
	}
}