EDIT

import org.apache.commons.lang.StringUtils;

	/**

	 * Returns <code>preferred</code> if not blank, else returns <code>alternative</code>.

	 * If reverse is <code>true</code> computation is 

	 * the other way round (<code>alternative</code> if not blank, otherwise <code>preferred</code>).

	 * @param preferred first string

	 * @param alternative second string

	 * @param reverse reverse flag

	 * @param nzTrim if <code>true</code> the result is trimmed and <code>null</code> values are replaced by empty string.

	 * @return the preferred string

	 */

	static public String getPreferredNonEmptyString(String preferred, String alternative, boolean reverse, boolean nzTrim){

		String result;

		if (! reverse){

			result = StringUtils.isBlank(preferred) ? alternative : preferred;

		}else{

			result = StringUtils.isBlank(alternative) ? preferred : alternative;

		}

		if (nzTrim){

			result = Nz(result).trim();

		}

		return result;

	}