franta-hg@16: /**
franta-hg@16:  * SQL-DK
franta-hg@16:  * Copyright © 2013 František Kučera (frantovo.cz)
franta-hg@16:  *
franta-hg@16:  * This program is free software: you can redistribute it and/or modify
franta-hg@16:  * it under the terms of the GNU General Public License as published by
franta-hg@16:  * the Free Software Foundation, either version 3 of the License, or
franta-hg@16:  * (at your option) any later version.
franta-hg@16:  *
franta-hg@16:  * This program is distributed in the hope that it will be useful,
franta-hg@16:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
franta-hg@16:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
franta-hg@16:  * GNU General Public License for more details.
franta-hg@16:  *
franta-hg@16:  * You should have received a copy of the GNU General Public License
franta-hg@16:  * along with this program. If not, see <http://www.gnu.org/licenses/>.
franta-hg@16:  */
franta-hg@1: package info.globalcode.sql.dk;
franta-hg@1: 
franta-hg@1: import java.util.ArrayList;
franta-hg@1: import java.util.Collection;
franta-hg@1: import java.util.Map;
franta-hg@1: 
franta-hg@1: /**
franta-hg@1:  *
franta-hg@1:  * @author Ing. František Kučera (frantovo.cz)
franta-hg@1:  */
franta-hg@1: public class Functions {
franta-hg@1: 
franta-hg@1: 	private Functions() {
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public static boolean equalz(Object a, Object b) {
franta-hg@1: 		return a == null ? b == null : a.equals(b);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 *
franta-hg@1: 	 * @param text String to be examinated
franta-hg@1: 	 * @param trim whether text should be trimmed before examination
franta-hg@1: 	 * @return whether text is not empty and one or more characters long (after prospective trim)
franta-hg@1: 	 */
franta-hg@1: 	public static boolean isEmpty(String text, boolean trim) {
franta-hg@1: 		if (text == null) {
franta-hg@1: 			return true;
franta-hg@1: 		} else {
franta-hg@1: 			if (trim) {
franta-hg@1: 				text = text.trim();
franta-hg@1: 			}
franta-hg@1: 			return text.isEmpty();
franta-hg@1: 		}
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 * @see #isEmpty(java.lang.String, boolean)
franta-hg@1: 	 */
franta-hg@1: 	public static boolean isNotEmpty(String text, boolean trim) {
franta-hg@1: 		return !isEmpty(text, trim);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isEmpty(Collection c) {
franta-hg@1: 		return c == null || c.isEmpty();
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isNotEmpty(Collection c) {
franta-hg@1: 		return !isEmpty(c);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isEmpty(Map m) {
franta-hg@1: 		return m == null || m.isEmpty();
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	public boolean isNotEmpty(Map m) {
franta-hg@1: 		return !isEmpty(m);
franta-hg@1: 	}
franta-hg@1: 
franta-hg@1: 	/**
franta-hg@1: 	 * @return empty collection if given one is null | or the original one
franta-hg@1: 	 */
franta-hg@1: 	public static <T> Collection<T> notNull(Collection<T> c) {
franta-hg@1: 		if (c == null) {
franta-hg@1: 			return new ArrayList<>();
franta-hg@1: 		} else {
franta-hg@1: 			return c;
franta-hg@1: 		}
franta-hg@1: 	}
franta-hg@1: }