package info.globalcode.sql.dk;

import java.util.ArrayList;

import java.util.Collection;

import java.util.Map;

/**

 *

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

 */

public class Functions {

	private Functions() {

	}

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

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

	}

	/**

	 *

	 * @param text String to be examinated

	 * @param trim whether text should be trimmed before examination

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

	 */

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

		if (text == null) {

			return true;

		} else {

			if (trim) {

				text = text.trim();

			}

			return text.isEmpty();

		}

	}

	/**

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

	 */

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

		return !isEmpty(text, trim);

	}

	public boolean isEmpty(Collection c) {

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

	}

	public boolean isNotEmpty(Collection c) {

		return !isEmpty(c);

	}

	public boolean isEmpty(Map m) {

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

	}

	public boolean isNotEmpty(Map m) {

		return !isEmpty(m);

	}

	/**

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

	 */

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

		if (c == null) {

			return new ArrayList<>();

		} else {

			return c;

		}

	}

}