mbien commented on code in PR #6658:
URL: https://github.com/apache/netbeans/pull/6658#discussion_r1405508090
##########
java/java.hints/src/org/netbeans/modules/java/hints/jdk/ConvertToLambdaPreconditionChecker.java:
##########
@@ -137,9 +137,48 @@ private MethodTree
getMethodFromFunctionalInterface(TreePath pathToNewClassTree)
candidate = (MethodTree)member;
}
}
+ // default methods can't be implemented with a lambda
+ ExecutableElement candidateElement = (ExecutableElement)
info.getTrees().getElement(new TreePath(pathToNewClassTree, candidate));
+ if (overridesDefaultMethod(candidateElement, (TypeElement)
baseElement)) {
+ return null;
+ }
return candidate;
}
+ private boolean overridesDefaultMethod(ExecutableElement method,
TypeElement superType) {
+ Boolean overrides = overridesDefaultMethodImpl(method, superType);
+ return overrides != null && overrides;
+ }
+
+ private Boolean overridesDefaultMethodImpl(ExecutableElement method,
TypeElement superType) {
+ List<? extends VariableElement> methodParams = method.getParameters();
+ for (Element e : superType.getEnclosedElements()) {
+ if (e.getKind() == ElementKind.METHOD &&
method.getSimpleName().equals(e.getSimpleName())
+ && parameterTypesMatch(methodParams, ((ExecutableElement)
e).getParameters())) {
+ return e.getModifiers().contains(Modifier.DEFAULT);
+ }
+ }
+ for (TypeMirror otherType : superType.getInterfaces()) {
+ Boolean overrides = overridesDefaultMethodImpl(method,
(TypeElement) types.asElement(otherType));
+ if (overrides != null) {
+ return overrides;
+ }
+ }
+ return null; // no match here but check the rest of the interface tree
+ }
Review Comment:
@lahodaj javac won't create the model of invalid code which produces cycles
in interface hierarchies, right? I tested it and this seems to work fine.
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