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/Command.java
*         greater than, equal to or less than this command.
	 */
	public final int compareTo(final Object object) {
		final Command castedObject = (Command) object;
		int compareTo = Util.compare(category, castedObject.category);
		if (compareTo == 0) {
			compareTo = Util.compare(defined, castedObject.defined);
			if (compareTo == 0) {
				compareTo = Util.compare(description, castedObject.description);
				if (compareTo == 0) {
					compareTo = Util.compare(handler, castedObject.handler);
					if (compareTo == 0) {
						compareTo = Util.compare(id, castedObject.id);
						if (compareTo == 0) {
							compareTo = Util.compare(name, castedObject.name);
							if (compareTo == 0) {
								compareTo = Util.compare(parameters,
										castedObject.parameters);
							}
						}
					}
				}
			}
		}
		return compareTo;
	}
	/**
	 * <p>
	 * Defines this command by giving it a name, and possibly a description as
	 * well. The defined property automatically becomes <code>true</code>.