src/org/tiefaces/components/websheet/utility/WebSheetUtility.java
public static String getSheetNameFromFullCellRefName(
			final String fullName) {
		if ((fullName != null) && (fullName.contains("!"))) {
			return fullName.substring(0, fullName.indexOf('!'));
		}
		return null;
	}
public static String getSheetNameFromFullCellRefName(
			final String fullName) {
		if ((fullName != null) && (fullName.contains("!"))) {
			return fullName.substring(0, fullName.indexOf('!'));
		}
		return null;
	}
public static String getSheetNameFromFullCellRefName ( final String fullName ) { if ( ( fullName != null ) && ( fullName . contains ( "!" ) ) ) { return fullName . substring ( 0 , fullName . indexOf ( ' ' ) ) ; } return null ; }
return sheet name from cell full name e.g. return Sheet1 from Sheet1$A$1

@param fullName
the full name
@return String Sheet Name
return sheet name from cell full name e . g . return Sheet1 from Sheet1$A$1