Added api to register custom PermissionHooks

api/src/main/java/us/ajg0702/queue/api/AjQueueAPI.java

@@ -3,6 +3,7 @@ package us.ajg0702.queue.api;
 import us.ajg0702.queue.api.events.utils.EventReceiver;
 import us.ajg0702.queue.api.premium.Logic;
 import us.ajg0702.queue.api.premium.LogicGetter;
+import us.ajg0702.queue.api.premium.PermissionHookRegistry;
 import us.ajg0702.queue.api.queueholders.QueueHolderRegistry;
 import us.ajg0702.queue.api.spigot.AjQueueSpigotAPI;
 import us.ajg0702.queue.api.util.QueueLogger;
@@ -15,6 +16,8 @@ public abstract class AjQueueAPI {
 
     public static QueueHolderRegistry queueHolderRegistry = new QueueHolderRegistry();
 
+    public static PermissionHookRegistry permissionHookRegistry = new PermissionHookRegistry();
+
     public static AjQueueAPI INSTANCE;
     public static AjQueueSpigotAPI SPIGOT_INSTANCE;
 
@@ -128,6 +131,10 @@ public abstract class AjQueueAPI {
         return queueHolderRegistry;
     }
 
+    public static PermissionHookRegistry getPermissionHookRegistry() {
+        return permissionHookRegistry;
+    }
+
     public abstract <E> void listen(Class<E> event, EventReceiver<E> handler);
 
     public abstract ExecutorService getServersUpdateExecutor();

api/src/main/java/us/ajg0702/queue/api/premium/PermissionHookRegistry.java

@@ -0,0 +1,24 @@
+package us.ajg0702.queue.api.premium;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+public class PermissionHookRegistry {
+    private final Map<String, PermissionHook> hooks = new HashMap<>();
+
+    public void register(PermissionHook... permissionHooks) {
+        for (PermissionHook hook : permissionHooks) {
+            if(hooks.containsKey(hook.getName())) {
+                throw new IllegalArgumentException("Hook " + hook.getName() + " is already registered!");
+            }
+        }
+        for (PermissionHook hook : permissionHooks) {
+            hooks.put(hook.getName(), hook);
+        }
+    }
+
+    public Collection<PermissionHook> getRegisteredHooks() {
+        return hooks.values();
+    }
+}