Bug 323489 [KeyBindings] Reduce memory footprint of BindingManager
bundles/org.eclipse.jface/src/org/eclipse/jface/bindings/BindingManager.java
* preference over those in a parent scheme. The rest of the calculaton is
	 * based most on various concepts of "length", as well as giving some
	 * modifier keys preference (e.g., <code>Alt</code> is less likely to
	 * appear than <code>Ctrl</code>).
	 * 
	 * @param commandId
	 *            The identifier of the command for which the best active
	 *            binding should be retrieved; must not be <code>null</code>.
	 * @return The formatted string for the best binding; may be
	 *         <code>null</code> if no bindings are active for the given
	 *         command.
	 * @since 3.2
	 */
	public final String getBestActiveBindingFormattedFor(final String commandId) {
		final TriggerSequence binding = getBestActiveBindingFor(commandId);
		if (binding != null) {
			return binding.format();
		}
		return null;
	}
	/**
	 * <p>
	 * Returns the set of all bindings managed by this class.
	 * </p>
	 * <p>
	 * This method completes in <code>O(1)</code>.
	 * </p>
	 * 
	 * @return The array of all bindings. This value may be <code>null</code>
	 *         and it may be empty.