<?php
// Own namespace
namespace Org\Mxchange\CoreFramework\String\Utils;

// Import framework stuff
use Org\Mxchange\CoreFramework\Configuration\FrameworkConfiguration;
use Org\Mxchange\CoreFramework\Generic\NullPointerException;
use Org\Mxchange\CoreFramework\Object\BaseFrameworkSystem;

// Import SPL stuff
use \InvalidArgumentException;

/**
 * A string utility class
 *
 * @author		Roland Haeder <webmaster@ship-simu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2019 Core Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.ship-simu.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
final class StringUtils extends BaseFrameworkSystem {
	/**
	 * Private constructor, no instance needed
	 *
	 * @return	void
	 */
	private function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);
	}

	/**
	 * Converts dashes to underscores, e.g. useable for configuration entries
	 *
	 * @param	$str	The string with maybe dashes inside
	 * @return	$str	The converted string with no dashed, but underscores
	 * @throws	NullPointerException	If $str is null
	 * @throws	InvalidArgumentException	If $str is empty
	 */
	public static function convertDashesToUnderscores ($str) {
		// Is it null?
		if (is_null($str)) {
			// Throw NPE
			throw new NullPointerException($this, self::EXCEPTION_IS_NULL_POINTER);
		} elseif (!is_string($str)) {
			// Entry is empty
			throw new InvalidArgumentException(sprintf('str[]=%s is not a string', gettype($str)), FrameworkConfiguration::EXCEPTION_CONFIG_KEY_IS_EMPTY);
		} elseif ((is_string($str)) && (empty($str))) {
			// Entry is empty
			throw new InvalidArgumentException('str is empty', FrameworkConfiguration::EXCEPTION_CONFIG_KEY_IS_EMPTY);
		}

		// Convert them all
		$str = str_replace('-', '_', $str);

		// Return converted string
		return $str;
	}

}