Bug 149922 Image builder - URI and file source type are treated as same
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/util/StringUtil.java
*            string representing a locale
	 * @return true if the locale is a valid locale, false if the locale is not
	 *         valid.
	 */
	public static boolean isValidLocale( String locale )
	{
		
		return true;
	}
	/**
	 * Reports if a string is blank. A string is considered blank either if it
	 * is null, is an empty string, of consists entirely of white space.
	 * <p>
	 * For example,
	 * <ul>
	 * <li>null, "" and " " are blank strings
	 * </ul>
	 * 
	 * @param str
	 *            the string to check
	 * @return true if the string is blank, false otherwise.
	 */
	public static boolean isBlank( String str )
	{
		return trimString( str ) == null;
	}
	/**
	 * Reports if a string is empty. A string is considered empty either if it
	 * is null, is an empty string.
	 * <p>