1 files changed, 45 insertions, 0 deletions
diff --git a/src/main/java/com/keuin/kbackupfabric/notification/DistinctNotifiable.java b/src/main/java/com/keuin/kbackupfabric/notification/DistinctNotifiable.java
new file mode 100644
index 0000000..b44bfce
--- /dev/null
+++ b/src/main/java/com/keuin/kbackupfabric/notification/DistinctNotifiable.java
@@ -0,0 +1,45 @@
+package com.keuin.kbackupfabric.notification;
+
+import net.minecraft.network.MessageType;
+import net.minecraft.server.network.ServerPlayerEntity;
+import net.minecraft.text.Text;
+
+/**
+ * Decouple from ServerPlayerEntity, in case further migration to other APIs.
+ */
+public interface DistinctNotifiable {
+
+    /**
+     * Does the receiver has privilege to receive some special message.
+     */
+    boolean isPrivileged();
+
+    void notify(Text text);
+
+    /**
+     * Get an unique, non-null object that identifies this notifiable instance.
+     * The identifier must be immutable and implement their own equals method.
+     *
+     * @return the identifier.
+     */
+    Object getIdentifier();
+
+    static DistinctNotifiable fromServerPlayerEntity(ServerPlayerEntity serverPlayerEntity) {
+        return new DistinctNotifiable() {
+            @Override
+            public boolean isPrivileged() {
+                return serverPlayerEntity.server.getPermissionLevel(serverPlayerEntity.getGameProfile()) >= serverPlayerEntity.server.getOpPermissionLevel();
+            }
+
+            @Override
+            public void notify(Text text) {
+                serverPlayerEntity.sendChatMessage(text, MessageType.SYSTEM);
+            }
+
+            @Override
+            public Object getIdentifier() {
+                return serverPlayerEntity.getUuid();
+            }
+        };
+    }
+}