Bug 38570 Source generation wizards; Add button to open preference page
M1 The Getter/Setter wizard should offer an access to the Code Generation Preference page: Field prefix/suffix, getter/setter body content, method comment template Add delegate, constructor and override could have a button for the method comment template The code to open a preference page programatically can be copied from TodoTaskPropertyPage.showPreferencePage
org.eclipse.jdt.ui/ui/org/eclipse/jdt/ui/actions/GenerateNewConstructorUsingFieldsAction.java
return type.getCompilationUnit() != null && type.isClass() && !type.isLocal();
			
		}
		if ((selection.size() == 1) && (selection.getFirstElement() instanceof ICompilationUnit))
			return true;
		return false;
	}
	/* (non-Javadoc)
	 * Method declared on SelectionDispatchAction
	 */
	public void run(IStructuredSelection selection) {
		try {
			IType selectionType= getSelectedType(selection);
			if (selectionType == null) {
				MessageDialog.openInformation(getShell(), getDialogTitle(), ActionMessages.getString("GenerateConstructorUsingFieldsAction.not_applicable")); 
				return;
			}
			IField[] selectedFields= getSelectedFields(selection);
			if (canRunOn(selectedFields)) {
				run(selectedFields[0].getDeclaringType(), selectedFields, false);
				return;
			}
			Object firstElement= selection.getFirstElement();
			if (firstElement instanceof IType) {
				run((IType) firstElement, new IField[0], false);
			}
			else if (firstElement instanceof ICompilationUnit) {
				IType type= ((ICompilationUnit) firstElement).findPrimaryType();
				if (type.isInterface()) {
					MessageDialog.openInformation(getShell(), getDialogTitle(), ActionMessages.getString("GenerateConstructorUsingFieldsAction.interface_not_applicable"));