Bug 121709 [Commands] parameters: Add types
I'm going to attach a patch that adds support for typed command parameters. This addresses several issues: - parameter values are strings, but handlers may want to work on objects - multiple handlers of a command should have a consistent way of converting string parameter values to objects - tooling to construct parameterized commands that starts with object parameter values needs a way of producing string parameter values that will work when the command is executed - there should be a way to classify commands by their object parameter types so, given an object, a set of commands that may work with it can be suggested To address these issues, the patch allows parameter types to be declared in the extension-point XML. The example below defines a command for negating integers and a parameter type that works with it. <extension point="org.eclipse.ui.commands"> <command id="org.example.commands.negateInteger" defaultHandler="org.example.commands.NegateIntegerHandler" name="Negate an Integer"> <commandParameter id="param" name="the param" optional="false" typeId="org.example.commands.Integer"/> </command> <commandParameterType id="org.example.commands.Integer" converter="org.example.commands.IntegerConverter" type="java.lang.Integer"/> </extension> In addition to extending the schema for org.eclipse.ui.commands, code has been added to a number of plugins (primarily org.eclipse.core.commands) to support the notion of typed parameters.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandManagerEvent.java
*/
	private final CommandManager commandManager;
	/**
	 * Creates a new instance of this class.
	 * 
	 * @param commandManager
	 *            the instance of the interface that changed; must not be
	 *            <code>null</code>.
	 * @param commandId
	 *            The command identifier that was added or removed; must not be
	 *            <code>null</code> if commandIdChanged is <code>true</code>.
	 * @param commandIdAdded
	 *            Whether the command identifier became defined (otherwise, it
	 *            became undefined).
	 * @param commandIdChanged
	 *            Whether the list of defined command identifiers has changed.
	 * @param categoryId
	 *            The category identifier that was added or removed; must not be
	 *            <code>null</code> if categoryIdChanged is <code>true</code>.
	 * @param categoryIdAdded
	 *            Whether the category identifier became defined (otherwise, it
	 *            became undefined).
	 * @param categoryIdChanged
	 *            Whether the list of defined category identifiers has changed.
	 */
	public CommandManagerEvent(final CommandManager commandManager,
			final String commandId, final boolean commandIdAdded,
			final boolean commandIdChanged, final String categoryId,
			final boolean categoryIdAdded, final boolean categoryIdChanged) {
		if (commandManager == null) {