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/CommandManager.java
if (executionListeners != null) {
				final Object[] listeners = executionListeners.getListeners();
				for (int i = 0; i < listeners.length; i++) {
					final Object object = listeners[i];
					if (object instanceof IExecutionListener) {
						final IExecutionListener listener = (IExecutionListener) object;
						listener.postExecuteSuccess(commandId, returnValue);
					}
				}
			}
		}
		public final void preExecute(final String commandId,
				final ExecutionEvent event) {
			if (executionListeners != null) {
				final Object[] listeners = executionListeners.getListeners();
				for (int i = 0; i < listeners.length; i++) {
					final Object object = listeners[i];
					if (object instanceof IExecutionListener) {
						final IExecutionListener listener = (IExecutionListener) object;
						listener.preExecute(commandId, event);
					}
				}
			}
		}
	}
	/**
	 * The identifier of the category in which all auto-generated commands will
	 * appear. This value must never be <code>null</code>.
	 */
	public static final String AUTOGENERATED_CATEGORY_ID = "org.eclipse.core.commands.categories.autogenerated";