added the CommandSender#getId() method

Author: WizardlyBump17

commands/src/main/java/com/wizardlybump17/wlib/command/sender/BasicCommandSender.java

@@ -69,6 +69,7 @@ public boolean hasId(@NotNull UUID id) {
         return id.equals(this.id);
     }
 
+    @Override
     public @NotNull UUID getId() {
         return id;
     }

commands/src/main/java/com/wizardlybump17/wlib/command/sender/CommandSender.java

@@ -30,4 +30,9 @@ public interface CommandSender<S> {
     boolean hasPermission(String permission);
 
     boolean hasId(@NotNull UUID id);
+
+    /**
+     * @throws IllegalStateException if the sender does not have an ID
+     */
+    @NotNull UUID getId() throws IllegalStateException;
 }

core/src/main/java/com/wizardlybump17/wlib/command/sender/BukkitCommandSender.java

@@ -101,6 +101,13 @@ public boolean hasId(@NotNull UUID id) {
         return handle instanceof Entity entity && entity.getUniqueId().equals(id);
     }
 
+    @Override
+    public @NotNull UUID getId() throws IllegalStateException {
+        if (handle instanceof Entity entity)
+            return entity.getUniqueId();
+        throw new IllegalStateException(handle + " does not have an ID");
+    }
+
     @ApiStatus.Internal
     public static void clearCache() {
         SENDERS_BY_ID.clear();