1 /*
2  * Copyright (C) 2013 The Android Open Source Project
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 package android.annotation;
17 
18 import static java.lang.annotation.ElementType.FIELD;
19 import static java.lang.annotation.ElementType.METHOD;
20 import static java.lang.annotation.ElementType.PARAMETER;
21 import static java.lang.annotation.RetentionPolicy.SOURCE;
22 
23 import android.annotation.SystemApi.Client;
24 
25 import java.lang.annotation.Retention;
26 import java.lang.annotation.Target;
27 
28 /**
29  * Denotes that a parameter, field or method return value can never be null.
30  * <p>
31  * This is a marker annotation and it has no specific attributes.
32  *
33  * @paramDoc This value must never be {@code null}.
34  * @returnDoc This value will never be {@code null}.
35  * @hide
36  */
37 @Retention(SOURCE)
38 @Target({METHOD, PARAMETER, FIELD})
39 @SystemApi(client = Client.MODULE_LIBRARIES)
40 public @interface NonNull {
41 }
42