Bug 315281 update copyrights for 3.6
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/StructuredViewer.java
unmapElement(element, item);
		item.setData(null);
	}
	/**
	 * Returns the widget in this viewer's control which represents the given
	 * element if it is the viewer's input.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * 
	 * @param element
	 * @return the corresponding widget, or <code>null</code> if none
	 */
	protected abstract Widget doFindInputItem(Object element);
	/**
	 * Returns the widget in this viewer's control which represent the given
	 * element. This method searches all the children of the input element.
	 * <p>
	 * This method is internal to the framework; subclassers should not call
	 * this method.
	 * </p>
	 * 
	 * @param element
	 * @return the corresponding widget, or <code>null</code> if none
	 */
	protected abstract Widget doFindItem(Object element);
	/**
	 * Copies the attributes of the given element into the given SWT item. The
	 * element map is updated according to the value of <code>fullMap</code>.