Bug 361443 Excel ODA
data/org.eclipse.birt.report.data.oda.excel/src/org/eclipse/birt/report/data/oda/excel/impl/ExcelFileQuery.java
throw new OdaException(e);
		} finally {
			if (excelFileSource != null)
				excelFileSource.close();
		}
	}
	private String[] createTempColumnNames(int columnCount) {
		String[] tempColumnNames = new String[columnCount];
		for (int i = 0; i < columnCount; i++) {
			tempColumnNames[i] = "COLUMN_" + (i + 1); 
		}
		return tempColumnNames;
	}
	private String[] createTempColumnTypes(int columnCount) {
		String[] tempColumnTypes = new String[columnCount];
		for (int i = 0; i < columnCount; i++) {
			tempColumnTypes[i] = "STRING"; 
		}
		return tempColumnTypes;
	}
	/**
	 * @param cCN
	 * @return
	 */
	private boolean isWildCard(String cCN) {
		if (cCN.equalsIgnoreCase(ExcelODAConstants.KEYWORD_ASTERISK))
			return true;
		return false;
	}
	private void validateUniqueName(String[] aCN) throws OdaException {