add footer annotation

Author: J4C0B3Y

core/src/main/java/net/j4c0b3y/api/config/ConfigDocument.java

@@ -75,7 +75,12 @@ public String dump(@NotNull DumperSettings settings) {
             .map(line -> "# " + line + "\n")
             .collect(Collectors.joining());
 
-        return header + (!header.isEmpty() ? "\n" : "") + content;
+        String footer = config.getFooter()
+            .stream()
+            .map(line -> "# " + line + "\n")
+            .collect(Collectors.joining());
+
+        return header + (!header.isEmpty() ? "\n" : "") + content + "\n" + footer;
     }
 
     /**

core/src/main/java/net/j4c0b3y/api/config/StaticConfig.java

@@ -120,6 +120,16 @@ public List<String> getHeader() {
         return Arrays.asList(header.value());
     }
 
+    /**
+     * @return The footer to be shown at the bottom of the document file.
+     */
+    public List<String> getFooter() {
+        Footer footer = getClass().getAnnotation(Footer.class);
+        if (footer == null) return Collections.emptyList();
+
+        return Arrays.asList(footer.value());
+    }
+
     /**
      * Creates, relocates and loads the document keys into the static fields.
      */
@@ -488,9 +498,21 @@ private String getRoute(Key key, String name) {
     protected @interface Hidden {
     }
 
+    /**
+     * Adds a header comment to the top of the config document.
+     */
     @Retention(RetentionPolicy.RUNTIME)
     @Target({ElementType.TYPE})
     public @interface Header {
         String[] value();
     }
+
+    /**
+     * Adds a footer comment to the bottom of the config document.
+     */
+    @Retention(RetentionPolicy.RUNTIME)
+    @Target({ElementType.TYPE})
+    public @interface Footer {
+        String[] value();
+    }
 }