add entity shulker_peek property

plugin/src/main/java/com/denizenscript/denizen/nms/interfaces/EntityHelper.java

@@ -466,4 +466,12 @@ public List<Player> getPlayersThatSee(Entity entity) {
     public void setTicksLived(Entity entity, int ticks) {
         entity.setTicksLived(ticks);
     }
+
+    public int getShulkerPeek(Entity entity) {
+        throw new UnsupportedOperationException();
+    }
+
+    public void setShulkerPeek(Entity entity, int peek) {
+        throw new UnsupportedOperationException();
+    }
 }

plugin/src/main/java/com/denizenscript/denizen/objects/properties/PropertyRegistry.java

@@ -83,6 +83,9 @@ public static void registermainProperties() {
         PropertyParser.registerProperty(EntityRotation.class, EntityTag.class);
         PropertyParser.registerProperty(EntityScoreboardTags.class, EntityTag.class);
         PropertyParser.registerProperty(EntitySmall.class, EntityTag.class);
+        if (NMSHandler.getVersion().isAtLeast(NMSVersion.v1_16)) {
+            PropertyParser.registerProperty(EntityShulkerPeek.class, EntityTag.class);
+        }
         PropertyParser.registerProperty(EntitySilent.class, EntityTag.class);
         PropertyParser.registerProperty(EntitySitting.class, EntityTag.class);
         PropertyParser.registerProperty(EntitySize.class, EntityTag.class);

plugin/src/main/java/com/denizenscript/denizen/objects/properties/entity/EntityShulkerPeek.java

@@ -0,0 +1,92 @@
+package com.denizenscript.denizen.objects.properties.entity;
+
+import com.denizenscript.denizen.nms.NMSHandler;
+import com.denizenscript.denizen.objects.EntityTag;
+import com.denizenscript.denizencore.objects.Mechanism;
+import com.denizenscript.denizencore.objects.ObjectTag;
+import com.denizenscript.denizencore.objects.core.ElementTag;
+import com.denizenscript.denizencore.objects.properties.Property;
+import com.denizenscript.denizencore.tags.Attribute;
+import org.bukkit.entity.Shulker;
+
+public class EntityShulkerPeek implements Property {
+
+    public static boolean describes(ObjectTag entity) {
+        return entity instanceof EntityTag &&
+                ((EntityTag) entity).getBukkitEntity() instanceof Shulker;
+    }
+
+    public static EntityShulkerPeek getFrom(ObjectTag entity) {
+        if (!describes(entity)) {
+            return null;
+        }
+        else {
+            return new EntityShulkerPeek((EntityTag) entity);
+        }
+    }
+
+    public static final String[] handledTags = new String[] {
+            "shulker_peek"
+    };
+
+    public static final String[] handledMechs = new String[] {
+            "shulker_peek"
+    };
+
+    private EntityShulkerPeek(EntityTag ent) {
+        entity = ent;
+    }
+
+    EntityTag entity;
+
+    @Override
+    public String getPropertyString() {
+        return String.valueOf(NMSHandler.getEntityHelper().getShulkerPeek(entity.getBukkitEntity()));
+    }
+
+    @Override
+    public String getPropertyId() {
+        return "shulker_peek";
+    }
+
+    @Override
+    public ObjectTag getObjectAttribute(Attribute attribute) {
+
+        if (attribute == null) {
+            return null;
+        }
+
+        // <--[tag]
+        // @attribute <EntityTag.shulker_peek>
+        // @returns ElementTag(Number)
+        // @mechanism EntityTag.shulker_peek
+        // @group properties
+        // @description
+        // Returns the peek value of a shulker box (where 0 is fully closed, 100 is fully open).
+        // -->
+        if (attribute.startsWith("shulker_peek")) {
+            return new ElementTag(NMSHandler.getEntityHelper().getShulkerPeek(entity.getBukkitEntity()))
+                    .getObjectAttribute(attribute.fulfill(1));
+        }
+
+        return null;
+    }
+
+    @Override
+    public void adjust(Mechanism mechanism) {
+
+        // <--[mechanism]
+        // @object EntityTag
+        // @name shulker_peek
+        // @input ElementTag(Number)
+        // @description
+        // Sets the peek value of a shulker box (where 0 is fully closed, 100 is fully open).
+        // @tags
+        // <EntityTag.shulker_peek>
+        // -->
+        if (mechanism.matches("shulker_peek") && mechanism.requireInteger()) {
+            NMSHandler.getEntityHelper().setShulkerPeek(entity.getBukkitEntity(), mechanism.getValue().asInt());
+        }
+    }
+}
+

v1_16/src/main/java/com/denizenscript/denizen/nms/v1_16/helpers/EntityHelperImpl.java

@@ -620,4 +620,14 @@ public void setTicksLived(Entity entity, int ticks) {
             ((CraftFallingBlock) entity).getHandle().ticksLived = ticks;
         }
     }
+
+    @Override
+    public int getShulkerPeek(Entity entity) {
+        return ((CraftShulker) entity).getHandle().eN();
+    }
+
+    @Override
+    public void setShulkerPeek(Entity entity, int peek) {
+        ((CraftShulker) entity).getHandle().a(peek);
+    }
 }