Bug 126414 [Commands] handlers: Provide help context ids
For commands and handlers to replace actions, they need to be capable of providing help context identifiers. For an example, see OpenResourceHandler in org.eclipse.ui.ide. This help context id will need to be definable through XML and through code.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/CommandManager.java
}
	/**
	 * Returns the set of identifiers for those parameter types that are
	 * defined.
	 * 
	 * @return The set of defined command parameter type identifiers; this value
	 *         may be empty, but it is never <code>null</code>.
	 * @since 3.2
	 */
	public final Set getDefinedParameterTypeIds() {
		return Collections.unmodifiableSet(definedParameterTypeIds);
	}
	/**
	 * Returns the command parameter types that are defined.
	 * 
	 * @return The defined command parameter types; this value may be empty, but
	 *         it is never <code>null</code>.
	 * @since 3.2
	 */
	public final ParameterType[] getDefinedParameterTypes() {
		final ParameterType[] parameterTypes = new ParameterType[definedParameterTypeIds
				.size()];
		final Iterator iterator = definedParameterTypeIds.iterator();
		int i = 0;
		while (iterator.hasNext()) {
			final String parameterTypeId = (String) iterator.next();
			parameterTypes[i++] = getParameterType(parameterTypeId);
		}
		return parameterTypes;
	}