Add bossbar provider

main/src/main/java/net/citizensnpcs/trait/versioned/BossBarTrait.java

@@ -2,6 +2,7 @@ package net.citizensnpcs.trait.versioned;
 
 import java.util.Collection;
 import java.util.List;
+import java.util.function.Supplier;
 
 import org.bukkit.Bukkit;
 import org.bukkit.attribute.Attribute;
@@ -42,6 +43,7 @@ public class BossBarTrait extends Trait {
     private BarColor color = BarColor.PURPLE;
     @Persist
     private List<BarFlag> flags = Lists.newArrayList();
+    private Supplier<Double> progressProvider;
     @Persist
     private int range = -1;
     @Persist
@@ -62,10 +64,12 @@ public class BossBarTrait extends Trait {
     private BossBar getBar() {
         if (npc.isSpawned() && isBoss(npc.getEntity()) && NMS.getBossBar(npc.getEntity()) != null)
             return (BossBar) NMS.getBossBar(npc.getEntity());
+
         if (barCache == null) {
             barCache = Bukkit.getServer().createBossBar(npc.getFullName(), color, style,
                     flags.toArray(new BarFlag[flags.size()]));
         }
+
         return barCache;
     }
 
@@ -102,6 +106,7 @@ public class BossBarTrait extends Trait {
         if (isBoss) {
             onDespawn();
         }
+
         return isBoss;
     }
 
@@ -113,6 +118,7 @@ public class BossBarTrait extends Trait {
     public void onDespawn() {
         if (barCache == null)
             return;
+
         barCache.removeAll();
         barCache.hide();
         barCache = null;
@@ -127,6 +133,7 @@ public class BossBarTrait extends Trait {
     public void run() {
         if (!npc.isSpawned())
             return;
+
         BossBar bar = getBar();
         if (bar == null)
             return;
@@ -157,21 +164,31 @@ public class BossBarTrait extends Trait {
                 bar.setProgress(Math.max(0, Math.min(1, number)));
             }
         }
+
         bar.setTitle(title);
         bar.setVisible(visible);
+        if (progressProvider != null) {
+            bar.setProgress(progressProvider.get());
+        }
+
         if (style != null) {
             bar.setStyle(style);
         }
+
         if (color != null) {
             bar.setColor(color);
         }
+
         for (BarFlag flag : BarFlag.values()) {
             bar.removeFlag(flag);
         }
+
         for (BarFlag flag : flags) {
             bar.addFlag(flag);
         }
+
         bar.removeAll();
+
         for (Player player : CitizensAPI.getLocationLookup().getNearbyPlayers(npc.getEntity().getLocation(),
                 range > 0 ? range : Setting.BOSSBAR_RANGE.asInt())) {
             if (viewPermission != null && !player.hasPermission(viewPermission))
@@ -192,6 +209,10 @@ public class BossBarTrait extends Trait {
         this.flags = flags;
     }
 
+    public void setProgressProvider(Supplier<Double> provider) {
+        this.progressProvider = provider;
+    }
+
     public void setRange(int range) {
         this.range = range;
     }
@@ -232,24 +253,31 @@ public class BossBarTrait extends Trait {
         if (style != null) {
             trait.setStyle(style);
         }
+
         if (color != null) {
             trait.setColor(color);
         }
+
         if (track != null) {
             trait.setTrackVariable(track);
         }
+
         if (title != null) {
             trait.setTitle(Messaging.parseComponents(title));
         }
+
         if (visible != null) {
             trait.setVisible(visible);
         }
+
         if (range != null) {
             trait.setRange(range);
         }
+
         if (viewpermission != null) {
             trait.setViewPermission(viewpermission);
         }
+
         if (flags != null) {
             List<BarFlag> parsed = Lists.newArrayList();
             for (String s : Splitter.on(',').omitEmptyStrings().trimResults().split(flags)) {