1 package info.globalcode.sql.dk;

     2 

     3 import java.util.ArrayList;

     4 import java.util.Collection;

     5 import java.util.Map;

     6 

     7 /**

     8  *

     9  * @author Ing. František Kučera (frantovo.cz)

    10  */

    11 public class Functions {

    12 

    13 	private Functions() {

    14 	}

    15 

    16 	public static boolean equalz(Object a, Object b) {

    17 		return a == null ? b == null : a.equals(b);

    18 	}

    19 

    20 	/**

    21 	 *

    22 	 * @param text String to be examinated

    23 	 * @param trim whether text should be trimmed before examination

    24 	 * @return whether text is not empty and one or more characters long (after prospective trim)

    25 	 */

    26 	public static boolean isEmpty(String text, boolean trim) {

    27 		if (text == null) {

    28 			return true;

    29 		} else {

    30 			if (trim) {

    31 				text = text.trim();

    32 			}

    33 			return text.isEmpty();

    34 		}

    35 	}

    36 

    37 	/**

    38 	 * @see #isEmpty(java.lang.String, boolean)

    39 	 */

    40 	public static boolean isNotEmpty(String text, boolean trim) {

    41 		return !isEmpty(text, trim);

    42 	}

    43 

    44 	public boolean isEmpty(Collection c) {

    45 		return c == null || c.isEmpty();

    46 	}

    47 

    48 	public boolean isNotEmpty(Collection c) {

    49 		return !isEmpty(c);

    50 	}

    51 

    52 	public boolean isEmpty(Map m) {

    53 		return m == null || m.isEmpty();

    54 	}

    55 

    56 	public boolean isNotEmpty(Map m) {

    57 		return !isEmpty(m);

    58 	}

    59 

    60 	/**

    61 	 * @return empty collection if given one is null | or the original one

    62 	 */

    63 	public static <T> Collection<T> notNull(Collection<T> c) {

    64 		if (c == null) {

    65 			return new ArrayList<>();

    66 		} else {

    67 			return c;

    68 		}

    69 	}

    70 }