[Feature] Lists (#40)

1 files changed, 7 insertions, 1 deletions

diff --git a/src/client/java/dev/isxander/yacl/api/OptionGroup.java b/src/client/java/dev/isxander/yacl/api/OptionGroup.java
index 3364bdf..6cc6c7f 100644
--- a/src/client/java/dev/isxander/yacl/api/OptionGroup.java
+++ b/src/client/java/dev/isxander/yacl/api/OptionGroup.java
@@ -31,7 +31,7 @@ public interface OptionGroup {
     /**
      * List of all options in the group
      */
-    @NotNull ImmutableList<Option<?>> options();
+    @NotNull ImmutableList<? extends Option<?>> options();
 
     /**
      * Dictates if the group should be collapsed by default.
@@ -96,6 +96,9 @@ public interface OptionGroup {
         public Builder option(@NotNull Option<?> option) {
             Validate.notNull(option, "`option` must not be null");
 
+            if (option instanceof ListOption<?>)
+                throw new UnsupportedOperationException("List options must not be added as an option but a group!");
+
             this.options.add(option);
             return this;
         }
@@ -109,6 +112,9 @@ public interface OptionGroup {
         public Builder options(@NotNull Collection<? extends Option<?>> options) {
             Validate.notEmpty(options, "`options` must not be empty");
 
+            if (options.stream().anyMatch(ListOption.class::isInstance))
+                throw new UnsupportedOperationException("List options must not be added as an option but a group!");
+
             this.options.addAll(options);
             return this;
         }