Bug 127861 [DataBinding] Mark API provisional
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/updatables/CalculatedValue.java
private Class valueType;
	/**
	 * Construct a CalculatedUpdatableValue for the specified valueType
	 * @param valueType
	 */
	public CalculatedValue(Class valueType) {
		this.valueType = valueType;
		handleChange();
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.databinding.IUpdatableValue#setValue(java.lang.Object)
	 */
	public void setValue(Object value) {
		throw new UnsupportedOperationException("CalculatedUpdatableValue objects are read-only"); 
	}
	
	private Object calculatedResult = null;
	/* (non-Javadoc)
	 * @see org.eclipse.jface.databinding.IUpdatableValue#getValueType()