content: /*
   * Copyright (C) 2013 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package android.annotation;
  
  import java.lang.annotation.Retention;
  import java.lang.annotation.Target;
  
  import static java.lang.annotation.ElementType.FIELD;
  import static java.lang.annotation.ElementType.METHOD;
  import static java.lang.annotation.ElementType.PARAMETER;
  import static java.lang.annotation.RetentionPolicy.SOURCE;
  
  /**
   * Denotes that a parameter, field or method return value can be null.
   * <p>
   * When decorating a method call parameter, this denotes that the parameter can
   * legitimately be null and the method will gracefully deal with it. Typically
   * used on optional parameters.
   * <p>
   * When decorating a method, this denotes the method might legitimately return
   * null.
   * <p>
   * This is a marker annotation and it has no specific attributes.
   *
   * @paramDoc This value may be {@code null}.
   * @returnDoc This value may be {@code null}.
   * @hide
   */
  @Retention(SOURCE)
  @Target({METHOD, PARAMETER, FIELD})
  public @interface Nullable {
  }
  