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/ParameterizedCommand.java
final Parameterization parameterization = parameterizations[i];
				nameBuffer.append(parameterization.getParameter().getName());
				nameBuffer.append(": "); 
				try {
					nameBuffer.append(parameterization.getValueName());
				} catch (final ParameterValuesException e) {
					/*
					 * Just let it go for now. If someone complains we can add
					 * more info later.
					 */
				}
				
				if (i + 1 < parameterizationCount) {
					nameBuffer.append(", "); 
				}
			}
			nameBuffer.append(')');
		}
		return nameBuffer.toString();
	}
	/**
	 * Returns the parameter map, as can be used to construct an
	 * <code>ExecutionEvent</code>.
	 * 
	 * @return The map of parameter ids (<code>String</code>) to parameter
	 *         values (<code>String</code>). This map is never
	 *         <code>null</code>, but may be empty.
	 */
	public final Map getParameterMap() {
		if ((parameterizations == null) || (parameterizations.length == 0)) {