Or get hold of leanpub.com/nbp4beginners
It hasn’t been updated for some time, but I’ve not yet seen anything in it
that needs updating.
Gj
On Sun, 13 Oct 2019 at 19:17, Marco Rossi <ma...@markreds.it> wrote:
> Hello Patrick,
>
> you should create your own Lookup where to put what you want. I called
> this “MutableLookup” (I’ve found it on the web). You can use the put method
> to add the instances or your objects to lookup.
>
> You could keep an instance of MutableLookup inside a TopComponent and call
> TopComponent.associateLookup(myMutableLookup) to expose your objects in the
> Lookup subsystem (via Utilities.actionsGlobalContext.lookup(...)) and
> retrieve them when the TopComponent is the active one.
>
> Since the “mutable” nature of this Lookup, you can add and remove your
> objects at runtime.
>
> Here follow the code of MutableLookup class:
>
> public class MutableLookup extends AbstractLookup {
> private static final Logger LOGGER =
> Logger.getLogger(MutableLookup.class.getName());
> private final Object lock = new Object();
> private final InstanceContent content;
>
> static {
> LOGGER.setLevel(Level.SEVERE);
> }
>
> /**
> * Create a new DynamicLookup
> */
> public MutableLookup() {
> this(new InstanceContent());
> }
>
> /**
> * Create a new DynamicLookup with the specific content
> * @param content
> */
> public MutableLookup(InstanceContent content) {
> super(content);
> this.content = content;
> }
>
> /**
> * Add a new object to this lookup.
> *
> * @param instance
> */
> public void add(Object instance) {
> synchronized (lock) {
> content.add(instance);
> }
> }
>
> /**
> * Put the instance in this lookup. This method ensures that there is
> only
> * one instance of that type class.
> * If there are other instances of the that class they will be removed.
> * If instance parameter is null than all instances of that type will
> be
> * removed from the lookup.
> *
> * @param <T>
> * @param type
> * @param instance
> */
> public <T> void put(Class<T> type, T instance) {
> synchronized (lock) {
> Collection<? extends T> all = lookupAll(type);
> if (instance == null) {
> remove(all);
> } else if (!all.contains(instance)) {
> remove(all);
> content.add(instance);
> LOGGER.log(Level.FINER, "added [{0}] to the lookup",
> instance);
> } else {
> List<T> instances = new LinkedList<T>(all);
> instances.remove(instance);
> remove(instances);
> }
> }
> }
>
> /**
> * Put collection in this lookup.
> * If there are other instances of the that class they will be
> replaced.
> *
> * @param <T>
> * @param type
> * @param items
> */
> public <T> void putAll(Class<T> type, Collection<? extends T> items) {
> synchronized (lock) {
> Collection<? extends T> all = lookupAll(type);
> remove(all);
> for (T item : items) {
> content.add(item);
> }
> }
> }
>
> /**
> * Remove instance from the lookup.
> *
> * @param instance
> */
> public void remove(Object instance) {
> synchronized (lock) {
> content.remove(instance);
> }
> }
>
> private <T> void remove(Collection<? extends T> items) {
> for (T item : items) {
> content.remove(item);
> LOGGER.log(Level.FINER, "removed [{0}] from the lookup.",
> item);
> }
> }
> }
>
> Marco Rossi
>
> > Il giorno 13 ott 2019, alle ore 18:13, Patrik Karlström <
> pat...@trixon.se> ha scritto:
> >
> > I feel somewhat stupid asking this one, but I just can't grip how to
> "publish" a "dynamically created" object so it will show up in lookupAll().
> >
> > This is a really small library I'm working on and the only NetBeans
> dependency I have is org-openide-util-lookup, if that matters at all.
> >
> > The following declared class:
> > @ServiceProvider(service = Window.class)
> > public class Left1bWindow extends Window {}
> >
> > shows up as expected when I do:
> > var windows = new
> ArrayList<>(Lookup.getDefault().lookupAll(Window.class));
> >
> > but a simple object creation will not.
> > Window someOtherWindow=new Window();
> >
> > What can I do to get the desired result?
>
>
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