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
* @since 3.2
	 */
	private final Parameterization[] getParameterizations(
			String serializedParameters, final IParameter[] parameters)
			throws SerializationException {
		if (serializedParameters == null
				|| (serializedParameters.length() == 0))
			return null;
		if ((parameters == null) || (parameters.length == 0))
			return null;
		final ArrayList paramList = new ArrayList();
		int commaPosition; 
		do {
			commaPosition = unescapedIndexOf(serializedParameters, ',');
			final String idEqualsValue;
			if (commaPosition == -1) {
				
				idEqualsValue = serializedParameters;
			} else {
				
				idEqualsValue = serializedParameters
						.substring(0, commaPosition);
				
				serializedParameters = serializedParameters
						.substring(commaPosition + 1);
			}
			final int equalsPosition = unescapedIndexOf(idEqualsValue, '=');
			final String parameterId;
			final String parameterValue;
			if (equalsPosition == -1) {