JUtils { public static Type declaringType(Type type) { if (type.isUnknown()) { return type; } JType t = (JType) type; return t.sema.type(t.typeBinding.getTypeDeclaration()); } private  JUtils(); static boolean isPrimitiveWrapper(Type type); @Nullable static Type primitiveWrapperType(Type type); @Nullable static Type primitiveType(Type type); static boolean isNullType(Type type); static boolean isIntersectionType(Type type); static boolean isTypeVar(Type type); static boolean isAnnotation(Symbol.TypeSymbol typeSymbol); static boolean isEffectivelyFinal(Symbol.VariableSymbol variableSymbol); static boolean isParameter(Symbol symbol); static Optional<Object> constantValue(Symbol.VariableSymbol symbol); static Set<Type> superTypes(Symbol.TypeSymbol typeSymbol); static Symbol.TypeSymbol outermostClass(Symbol.TypeSymbol typeSymbol); static Symbol getPackage(Symbol symbol); static boolean isVarArgsMethod(Symbol.MethodSymbol method); static boolean isSynchronizedMethod(Symbol.MethodSymbol method); static boolean isNativeMethod(Symbol.MethodSymbol method); static boolean isDefaultMethod(Symbol.MethodSymbol method); @Nullable static Object defaultValue(Symbol.MethodSymbol method); static boolean isOverridable(Symbol.MethodSymbol method); static boolean isParametrizedMethod(Symbol.MethodSymbol method); static boolean isRawType(Type type); static Type declaringType(Type type); static Set<Type> directSuperTypes(Type type); @Nullable static Symbol enclosingClass(Tree t); @Nullable static Symbol importTreeSymbol(ImportTree tree); static Symbol typeParameterTreeSymbol(TypeParameterTree tree); static SymbolMetadata parameterAnnotations(Symbol.MethodSymbol method, int param);  }
@Test void declaringType() { JavaTree.CompilationUnitTreeImpl cu = test("class C<T> { void foo(C d, Unknown u) {} }"); ClassTreeImpl c = (ClassTreeImpl) cu.types().get(0); MethodTreeImpl m = (MethodTreeImpl) c.members().get(0); VariableTreeImpl cRaw = (VariableTreeImpl) m.parameters().get(0); VariableTreeImpl unknown = (VariableTreeImpl) m.parameters().get(1); assertThat(JUtils.declaringType(unknown.symbol().type())) .isSameAs(unknown.symbol().type()); assertThat(JUtils.declaringType(cRaw.type().symbolType())) .isSameAs(JUtils.declaringType(c.symbol().type())) .isSameAs(c.symbol().type()); }