[fixes #1918] toString now supports a configkey to tell it how to deal with super.

doc/changelog.markdown

@@ -4,6 +4,8 @@ Lombok Changelog
 ### v1.18.5 "Edgy Guinea Pig"
 * BUGFIX: Since version 1.18.4, the delombok ant task didn't work and errored with a `NoClassDefFoundError`. [Issue #1932](https://github.com/rzwitserloot/lombok/issues/1932)
 * FEATURE: The `@FieldNameConstants` feature now allows you to write the inner type by hand and add whatever you like to it; lombok will add the constants to this class. See the updated [FieldNameConstants feature](https://projectlombok.org/features/experimental/FieldNameConstants) page.
+* FEATURE: There is now a `lombok.config` key to configure `@ToString`'s call super behavior; it's just like `@EqualsAndHashCode` which has had it for a while now. [Issue #1918](https://github.com/rzwitserloot/lombok/issues/1918)
+
 ### v1.18.4 (October 30th, 2018)
 * PLATFORM: Support for Eclipse Photon. [Issue #1831](https://github.com/rzwitserloot/lombok/issues/1831)
 * PLATFORM: Angular IDE is now recognized by the installer [Issue #1830](https://github.com/rzwitserloot/lombok/issues/1830)

src/core/lombok/ConfigurationKeys.java

@@ -214,7 +214,7 @@ public class ConfigurationKeys {
 	 * 
 	 * For any class with an {@code @EqualsAndHashCode} annotation which extends a class other than {@code java.lang.Object}, should a call to superclass's implementation of {@code equals} and {@code hashCode} be included in the generated methods? (Default = warn)
 	 */
-	public static final ConfigurationKey<CallSuperType> EQUALS_AND_HASH_CODE_CALL_SUPER = new ConfigurationKey<CallSuperType>("lombok.equalsAndHashCode.callSuper", "When generating equals and hashCode for classes that don't extend Object, either automatically take into account superclass implementation (call), or don't (skip), or warn and don't (warn). (default = warn).") {};
+	public static final ConfigurationKey<CallSuperType> EQUALS_AND_HASH_CODE_CALL_SUPER = new ConfigurationKey<CallSuperType>("lombok.equalsAndHashCode.callSuper", "When generating equals and hashCode for classes that extend something (other than Object), either automatically take into account superclass implementation (call), or don't (skip), or warn and don't (warn). (default = warn).") {};
 	
 	/**
 	 * lombok configuration: {@code lombok.equalsAndHashCode.flagUsage} = {@code WARNING} | {@code ERROR}.
@@ -232,6 +232,13 @@ public class ConfigurationKeys {
 	 */
 	public static final ConfigurationKey<Boolean> TO_STRING_DO_NOT_USE_GETTERS = new ConfigurationKey<Boolean>("lombok.toString.doNotUseGetters", "Don't call the getters but use the fields directly in the generated toString method (default = false).") {};
 	
+	/**
+	 * lombok configuration: {@code lombok.toString.callSuper} = {@code call} | {@code ignore} | {@code warn}.
+	 * 
+	 * For any class with an {@code @ToString} annotation which extends a class other than {@code java.lang.Object}, should a call to superclass's implementation of {@code toString} be included in the generated method? (Default = skip)
+	 */
+	public static final ConfigurationKey<CallSuperType> TO_STRING_CALL_SUPER = new ConfigurationKey<CallSuperType>("lombok.toString.callSuper", "When generating toString for classes that extend something (other than Object), either automatically take into account superclass implementation (call), or don't (skip), or warn and don't (warn). (default = warn).") {};
+	
 	/**
 	 * lombok configuration: {@code lombok.toString.flagUsage} = {@code WARNING} | {@code ERROR}.
 	 * 

src/core/lombok/eclipse/handlers/HandleToString.java

@@ -36,6 +36,7 @@ import lombok.ConfigurationKeys;
 import lombok.ToString;
 import lombok.core.AST.Kind;
 import lombok.core.AnnotationValues;
+import lombok.core.configuration.CallSuperType;
 import lombok.core.handlers.InclusionExclusionUtils;
 import lombok.core.handlers.InclusionExclusionUtils.Included;
 import lombok.eclipse.Eclipse;
@@ -119,12 +120,6 @@ public class HandleToString extends EclipseAnnotationHandler<ToString> {
 		boolean notAClass = (modifiers &
 				(ClassFileConstants.AccInterface | ClassFileConstants.AccAnnotation)) != 0;
 		
-		if (callSuper == null) {
-			try {
-				callSuper = ((Boolean)ToString.class.getMethod("callSuper").getDefaultValue()).booleanValue();
-			} catch (Exception ignore) {}
-		}
-		
 		if (typeDecl == null || notAClass) {
 			errorNode.addError("@ToString is only supported on a class or enum.");
 			return;
@@ -132,6 +127,27 @@ public class HandleToString extends EclipseAnnotationHandler<ToString> {
 		
 		switch (methodExists("toString", typeNode, 0)) {
 		case NOT_EXISTS:
+			if (callSuper == null) {
+				if (isDirectDescendantOfObject(typeNode)) {
+					callSuper = false;
+				} else {
+					CallSuperType cst = typeNode.getAst().readConfiguration(ConfigurationKeys.TO_STRING_CALL_SUPER);
+					if (cst == null) cst = CallSuperType.SKIP;
+					switch (cst) {
+					default:
+					case SKIP:
+						callSuper = false;
+						break;
+					case WARN:
+						errorNode.addWarning("Generating toString implementation but without a call to superclass, even though this class does not extend java.lang.Object. If this intentional, add '@ToString(callSuper=false)' to your type.");
+						callSuper = false;
+						break;
+					case CALL:
+						callSuper = true;
+						break;
+					}
+				}
+			}
 			MethodDeclaration toString = createToString(typeNode, members, includeFieldNames, callSuper, errorNode.get(), fieldAccess);
 			injectMethod(typeNode, toString);
 			break;

src/core/lombok/javac/apt/EmptyLombokFileObject.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010-2011 The Project Lombok Authors.
+ * Copyright (C) 2010-2018 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
@@ -52,8 +52,7 @@ class EmptyLombokFileObject implements LombokFileObject {
 	@Override public boolean isNameCompatible(String simpleName, Kind kind) {
 		String baseName = simpleName + kind.extension;
 		return kind.equals(getKind())
-		&& (baseName.equals(toUri().getPath())
-				|| toUri().getPath().endsWith("/" + baseName));
+		&& (baseName.equals(toUri().getPath()) || toUri().getPath().endsWith("/" + baseName));
 	}
 	
 	@Override public URI toUri() {
@@ -112,12 +111,8 @@ class EmptyLombokFileObject implements LombokFileObject {
 	}
 	
 	@Override public boolean equals(Object obj) {
-		if (!(obj instanceof EmptyLombokFileObject)) {
-			return false;
-		}
-		if (obj == this) {
-			return true;
-		}
+		if (!(obj instanceof EmptyLombokFileObject)) return false;
+		if (obj == this) return true;
 		EmptyLombokFileObject other = (EmptyLombokFileObject) obj;
 		return name.equals(other.name) && kind.equals(other.kind);
 	}

src/core/lombok/javac/handlers/HandleToString.java

@@ -30,6 +30,7 @@ import java.util.Collection;
 import lombok.ConfigurationKeys;
 import lombok.ToString;
 import lombok.core.AnnotationValues;
+import lombok.core.configuration.CallSuperType;
 import lombok.core.AST.Kind;
 import lombok.core.handlers.InclusionExclusionUtils;
 import lombok.core.handlers.InclusionExclusionUtils.Included;
@@ -111,12 +112,6 @@ public class HandleToString extends JavacAnnotationHandler<ToString> {
 			notAClass = (flags & (Flags.INTERFACE | Flags.ANNOTATION)) != 0;
 		}
 		
-		if (callSuper == null) {
-			try {
-				callSuper = ((Boolean) ToString.class.getMethod("callSuper").getDefaultValue()).booleanValue();
-			} catch (Exception ignore) {}
-		}
-		
 		if (notAClass) {
 			source.addError("@ToString is only supported on a class or enum.");
 			return;
@@ -124,6 +119,27 @@ public class HandleToString extends JavacAnnotationHandler<ToString> {
 		
 		switch (methodExists("toString", typeNode, 0)) {
 		case NOT_EXISTS:
+			if (callSuper == null) {
+				if (isDirectDescendantOfObject(typeNode)) {
+					callSuper = false;
+				} else {
+					CallSuperType cst = typeNode.getAst().readConfiguration(ConfigurationKeys.TO_STRING_CALL_SUPER);
+					if (cst == null) cst = CallSuperType.SKIP;
+					switch (cst) {
+					default:
+					case SKIP:
+						callSuper = false;
+						break;
+					case WARN:
+						source.addWarning("Generating toString implementation but without a call to superclass, even though this class does not extend java.lang.Object. If this is intentional, add '@ToString(callSuper=false)' to your type.");
+						callSuper = false;
+						break;
+					case CALL:
+						callSuper = true;
+						break;
+					}
+				}
+			}
 			JCMethodDecl method = createToString(typeNode, members, includeFieldNames, callSuper, fieldAccess, source.get());
 			injectMethod(typeNode, method);
 			break;

test/transform/resource/after-delombok/ToStringAutoSuper.java

@@ -0,0 +1,15 @@
+class ToStringAutoSuperWithNoParent {
+	@java.lang.Override
+	@java.lang.SuppressWarnings("all")
+	public java.lang.String toString() {
+		return "ToStringAutoSuperWithNoParent()";
+	}
+}
+
+class ToStringAutoSuperWithParent extends ToStringAutoSuperWithNoParent {
+	@java.lang.Override
+	@java.lang.SuppressWarnings("all")
+	public java.lang.String toString() {
+		return "ToStringAutoSuperWithParent(super=" + super.toString() + ")";
+	}
+}

test/transform/resource/after-ecj/ToStringAutoSuper.java

@@ -0,0 +1,16 @@
+@lombok.ToString class ToStringAutoSuperWithNoParent {
+  ToStringAutoSuperWithNoParent() {
+    super();
+  }
+  public @java.lang.Override @java.lang.SuppressWarnings("all") java.lang.String toString() {
+    return "ToStringAutoSuperWithNoParent()";
+  }
+}
+@lombok.ToString class ToStringAutoSuperWithParent extends ToStringAutoSuperWithNoParent {
+  ToStringAutoSuperWithParent() {
+    super();
+  }
+  public @java.lang.Override @java.lang.SuppressWarnings("all") java.lang.String toString() {
+    return (("ToStringAutoSuperWithParent(super=" + super.toString()) + ")");
+  }
+}

test/transform/resource/before/ToStringAutoSuper.java

@@ -0,0 +1,8 @@
+//CONF: lombok.toString.callSuper = CALL
+@lombok.ToString
+class ToStringAutoSuperWithNoParent {
+}
+
+@lombok.ToString
+class ToStringAutoSuperWithParent extends ToStringAutoSuperWithNoParent {
+}

website/templates/features/ToString.html

@@ -28,6 +28,10 @@
 			<code>lombok.toString.doNotUseGetters</code> = [<code>true</code> | <code>false</code>] (default: false)
 		</dt><dd>
 			If set to <code>true</code>, lombok will access fields directly instead of using getters (if available) when generating <code>toString</code> methods. The annotation parameter '<code>doNotUseGetters</code>', if explicitly specified, takes precedence over this setting.
+		</dd><dt>
+			<code>lombok.toString.callSuper</code> = [<code>call</code> | <code>skip</code> | <code>warn</code>] (default: skip)
+		</dt><dd>
+			If set to <code>call</code>, lombok will generate calls to the superclass implementation of <code>toString</code> if your class extends something. If set to <code>skip</code> no such call is generated. If set to <code>warn</code> no such call is generated either, but lombok does generate a warning to tell you about it.
 		</dd><dt>
 			<code>lombok.toString.flagUsage</code> = [<code>warning</code> | <code>error</code>] (default: not set)
 		</dt><dd>