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
* <p>
	 * This method will never return <code>null</code>, however it may throw
	 * an exception if there is a problem processing the serialization string or
	 * the encoded command is undefined.
	 * </p>
	 * 
	 * @param serializedParameterizedCommand
	 *            a string representing a command id and parameter ids and
	 *            values; must not be <code>null</code>
	 * @return a {@link ParameterizedCommand} with the command and
	 *         parameterizations encoded in the
	 *         <code>serializedParameterizedCommand</code>; never
	 *         <code>null</code>.
	 * @throws NotDefinedException
	 *             if the command indicated in
	 *             <code>serializedParameterizedCommand</code> is not defined
	 * @throws SerializationException
	 *             if there is an error deserializing
	 *             <code>serializedParameterizedCommand</code>
	 * @see ParameterizedCommand#serialize()
	 * @since 3.2
	 */
	public final ParameterizedCommand deserialize(
			final String serializedParameterizedCommand)
			throws NotDefinedException, SerializationException {
		final int lparenPosition = unescapedIndexOf(
				serializedParameterizedCommand, PARAMETER_START_CHAR);
		final String commandIdEscaped;
		final String serializedParameters;
		if (lparenPosition == -1) {