src/org/tiefaces/components/websheet/dataobjects/CachedCells.java
public final boolean isValueChanged(final Cell cell,
			final String pnewValue) {
		Map<Cell, FormulaMapping> map = cachedMap;
		String oldValue = map.get(cell).getValue();
		String newValue = pnewValue;
		if (oldValue == null) {
			oldValue = "";
		}
		if (newValue == null) {
			newValue = "";
		}
		return (!oldValue.equals(newValue));
	}
public final boolean isValueChanged(final Cell cell,
			final String pnewValue) {
		Map<Cell, FormulaMapping> map = cachedMap;
		String oldValue = map.get(cell).getValue();
		String newValue = pnewValue;
		if (oldValue == null) {
			oldValue = "";
		}
		if (newValue == null) {
			newValue = "";
		}
		return (!oldValue.equals(newValue));
	}
Checks if is value changed.

@param cell
the cell
@param pnewValue
the new value

@return true, if is value changed