1 files changed, 29 insertions, 0 deletions
diff --git a/src/core/lombok/javac/handlers/HandleBuilderDefault.java b/src/core/lombok/javac/handlers/HandleBuilderDefault.java
new file mode 100644
index 00000000..733aea5a
--- /dev/null
+++ b/src/core/lombok/javac/handlers/HandleBuilderDefault.java
@@ -0,0 +1,29 @@
+package lombok.javac.handlers;
+
+import static lombok.javac.handlers.JavacHandlerUtil.*;
+
+import org.mangosdk.spi.ProviderFor;
+
+import com.sun.tools.javac.tree.JCTree.JCAnnotation;
+
+import lombok.Builder;
+import lombok.core.AST.Kind;
+import lombok.core.AnnotationValues;
+import lombok.core.HandlerPriority;
+import lombok.javac.JavacAnnotationHandler;
+import lombok.javac.JavacNode;
+
+@ProviderFor(JavacAnnotationHandler.class)
+@HandlerPriority(-1025) //HandleBuilder's level, minus one.
+public class HandleBuilderDefault extends JavacAnnotationHandler<Builder.Default> {
+	@SuppressWarnings("deprecation")
+	@Override public void handle(AnnotationValues<Builder.Default> annotation, JCAnnotation ast, JavacNode annotationNode) {
+		JavacNode annotatedField = annotationNode.up();
+		if (annotatedField.getKind() != Kind.FIELD) return;
+		JavacNode classWithAnnotatedField = annotatedField.up();
+		if (!hasAnnotation(Builder.class, classWithAnnotatedField) && !hasAnnotation(lombok.experimental.Builder.class, classWithAnnotatedField)) {
+			annotationNode.addWarning("@Builder.Default requires @Builder on the class for it to mean anything.");
+			deleteAnnotationIfNeccessary(annotationNode, Builder.Default.class);
+		}
+	}
+}