Use enum instead of Boolean; switch to synchronized map

src/core/lombok/eclipse/TransformEclipseAST.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009-2019 The Project Lombok Authors.
+ * Copyright (C) 2009-2020 The Project Lombok Authors.
  * 
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -24,6 +24,8 @@ package lombok.eclipse;
 import static lombok.eclipse.handlers.EclipseHandlerUtil.*;
 
 import java.lang.reflect.Field;
+import java.util.Collections;
+import java.util.Map;
 import java.util.WeakHashMap;
 
 import lombok.ConfigurationKeys;
@@ -64,7 +66,7 @@ public class TransformEclipseAST {
 	
 	public static boolean disableLombok = false;
 	private static final HistogramTracker lombokTracker;
-	private static WeakHashMap<CompilationUnitDeclaration, Boolean> completlyHandled = new WeakHashMap<CompilationUnitDeclaration, Boolean>();
+	private static Map<CompilationUnitDeclaration, State> transformationStates = Collections.synchronizedMap(new WeakHashMap<CompilationUnitDeclaration, State>());
 	
 	static {
 		String v = System.getProperty("lombok.histogram");
@@ -143,14 +145,14 @@ public class TransformEclipseAST {
 	 * @return <code>true</code> if this AST was already handled by lombok.
 	 */
 	public static boolean alreadyTransformed(CompilationUnitDeclaration ast) {
-		Boolean state = completlyHandled.get(ast);
-		if (state != null) {
-			if (state) return true;
+		State state = transformationStates.get(ast);
+		
+		if (state == State.FULL) return true;
+		if (state == State.DIET) {
 			if (!EclipseAST.isComplete(ast)) return true;
-			
-			completlyHandled.put(ast, Boolean.TRUE);
+			transformationStates.put(ast, State.FULL);
 		} else {
-			completlyHandled.put(ast, Boolean.FALSE);
+			transformationStates.put(ast, State.DIET);
 		}
 		return false;
 	}
@@ -270,4 +272,9 @@ public class TransformEclipseAST {
 			nextPriority = Math.min(nextPriority, handlers.handleAnnotation(top, annotationNode, annotation, priority));
 		}
 	}
+	
+	private static enum State {
+		DIET,
+		FULL
+	}
 }