82 lines
2.0 KiB
Java
82 lines
2.0 KiB
Java
package lol.pyr.znpcsplus.util;
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import org.bukkit.entity.Player;
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.stream.Collectors;
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public abstract class Viewable {
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private final static List<WeakReference<Viewable>> all = new ArrayList<>();
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public static List<Viewable> all() {
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all.removeIf(reference -> reference.get() == null);
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return all.stream()
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.map(Reference::get)
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.collect(Collectors.toList());
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}
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private final Set<Player> viewers = ConcurrentHashMap.newKeySet();
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public Viewable() {
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all.add(new WeakReference<>(this));
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}
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public void delete() {
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UNSAFE_hideAll();
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viewers.clear();
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}
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public void respawn() {
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UNSAFE_hideAll();
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UNSAFE_showAll();
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}
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public void respawn(Player player) {
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if (!viewers.contains(player)) return;
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UNSAFE_hide(player);
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UNSAFE_show(player);
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}
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public void show(Player player) {
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if (viewers.contains(player)) return;
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viewers.add(player);
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UNSAFE_show(player);
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}
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public void hide(Player player) {
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if (!viewers.contains(player)) return;
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viewers.remove(player);
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UNSAFE_hide(player);
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}
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public void UNSAFE_removeViewer(Player player) {
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viewers.remove(player);
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}
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protected void UNSAFE_hideAll() {
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for (Player viewer : viewers) UNSAFE_hide(viewer);
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}
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protected void UNSAFE_showAll() {
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for (Player viewer : viewers) UNSAFE_show(viewer);
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}
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public Set<Player> getViewers() {
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return Collections.unmodifiableSet(viewers);
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}
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public boolean isVisibleTo(Player player) {
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return viewers.contains(player);
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}
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protected abstract void UNSAFE_show(Player player);
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protected abstract void UNSAFE_hide(Player player);
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}
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