D-Net

package eu.dnetlib.util;

import java.net.MalformedURLException;

import java.net.URL;

public class UtilityFunctions {

	public static boolean isEmpty(String str) {

		return str == null || str.trim().length() == 0;

	}

	/**

	 * Filters a string. Returns the string of "" if the string is null

	 * 

	 * @param str

	 *            the string to be filter

	 * @return the actual string or "" if str is null

	 */

	public static String filterNull(String str) {

		return str == null ? "" : str;

	}

	public static boolean nonEmpty(String str) {

		return !isEmpty(str);

	}

	public static boolean isValidURL(String str) {

		if (isEmpty(str))

			return false;

		boolean valid = true;

		try {

			new URL(str.trim());

		} catch (MalformedURLException e) {

			valid = false;

		}

		return valid;

	}

}