1 /* 2 * Copyright 2020 The JSpecify Authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 import org.jspecify.annotations.NullMarked; 17 import org.jspecify.annotations.Nullable; 18 import org.jspecify.annotations.NullnessUnspecified; 19 20 @NullMarked 21 class OverrideReturns { 22 interface Super { makeObject()23 Object makeObject(); 24 makeObjectUnspec()25 @NullnessUnspecified Object makeObjectUnspec(); 26 makeObjectUnionNull()27 @Nullable Object makeObjectUnionNull(); 28 } 29 30 interface SubObject extends Super { 31 @Override makeObject()32 Object makeObject(); 33 34 @Override makeObjectUnspec()35 Object makeObjectUnspec(); 36 37 @Override makeObjectUnionNull()38 Object makeObjectUnionNull(); 39 } 40 41 interface SubObjectUnspec extends Super { 42 @Override 43 // jspecify_nullness_not_enough_information makeObject()44 @NullnessUnspecified Object makeObject(); 45 46 @Override 47 // jspecify_nullness_not_enough_information makeObjectUnspec()48 @NullnessUnspecified Object makeObjectUnspec(); 49 50 @Override makeObjectUnionNull()51 @NullnessUnspecified Object makeObjectUnionNull(); 52 } 53 54 interface SubObjectUnionNull extends Super { 55 @Override 56 // jspecify_nullness_mismatch makeObject()57 @Nullable Object makeObject(); 58 59 @Override 60 // jspecify_nullness_not_enough_information makeObjectUnspec()61 @Nullable Object makeObjectUnspec(); 62 63 @Override makeObjectUnionNull()64 @Nullable Object makeObjectUnionNull(); 65 } 66 } 67